M CHOICE

WELDING INSPECTION, STEEL – WIS 5MULTI – CHOICE QUESTION PAPER ( MSR – WI – 4)

Answer all question

1. Degreasing components are essential for quality welding but when welded some agent may :

a. Cause corrosion problemsb. Leave residuesc. Give off toxic gages d. All of the above

2. Cellulose electrodes are often used for the deposition of a root pass on pipes welded in the field. This is because?

a. Hydrogen control is required b. The high deposition rate due to the iron powder contentc. The hydrogen gas produced in the flux increases the arc voltaged. All of the above

3. In the welding of austenitic stainless steels, the electrode and plate materials are often specified to be low carbon content. The reason for this:

a. To prevent the formation of cracks in the hazb. To prevent the formation of chromium carbidesc. To prevent cracking in the weldd. Minimize distortion

4. With regards to a welding procedure, an essential variable may:a. Change the properties of the weldb. Influence the visual acceptancec. Require re-approval of a weld procedured. All of the above

5. Which of the following NDT methods can only detect surface breaking defects?

a. MPIb. DPIc. UTd. RTe. Both a and b

6. Which of the following defects would show up as light indications on a radiograph?

a. Slag inclusions and copper inclusion b. Tungsten inclusions and excessive root penetration c. Cap undercut and root pipingd. Excessive cap height and incomplete root penetration

7. Which of the following electrodes is the most likely to contain the largest quantity of combustible organic compounds?

a. Basicb. Acidicc. Rutiled. Cellulose.

8. Lamellar tearing is the best prevented by:

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a. The use of plate materials containing low levels of impuritiesb. The use of buttering runsc. Post weld stress reliefd. Both a and be. All of the above

9. When considering radiography using x-ray, which of the following techniques is most likely to be used for a pipe to pipe weld(circumferential seam), 610mm diameter with no internal access?

a. SWSIb. DWSIc. DWDId. SWSI-panoramic.

10. A balanced welding technique for example back step welding is most often used for:

a. Controlling lamellar tearing b. Increasing weld toughnessc. Reducing weld zone hardnessd. Reducing distortion

11. Basic coated electrodes have which of the following propertiesa. High mechanical properties may be used to produce welds of high

deposition rates and to produce welds of low hydrogen content.b. Friable slag, high mechanical strength and to produce welds of a

low hydrogen contentc. Low hydrogen content welds, good stop/start properties and high

strength d. Low carbon content welds, friable slag and high strength

12. On a radiograph, the most likely appearance of lack of root fusion on a single-v butt weld is :

a. A dark straight line with a light rootb. A dark root with straight edgesc. A dark uneven line following the edge of the rootd. None of the above lack of root fusion can not be seen on a

radiograph

13. What do you understand by the term minimum interpass temperature?

a. Min post weld heat treatment applied to a weldb. Min stress relief temc. The lowest tem to be used during preheatd. The lowest tem allowed during welding and between weld passes

14. Which of the following is applicable to a plate laminationa. They are best detected by radiographyb. They are mainly caused by hydrogen entrapmentc. They originate in the parent materiald. They are caused when welding stresses act parallel with the rolled

direction of the parent plate15. Which of the following NDT methods would be the least effective on

an austenitic steel butt weld

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a. UTb. RTc. DPId. MPI

16. The hardest part of a multi-pass welded joint, assuming no post weld heat treatment has have taken place is :

a. The HAZ of the cap b. The HAZ of the rootc. The rootd. The cap

17. Is it permissible to allow a single pass butt weld to cool down between weld passes?

a. It should be up to the welding inspectorb. No the weld must be kept hot at all timec. It depends on the welder d. It depends on the specification requirements

18. The usual method of assessing the sensitivity and density of a radiograph is by mean

a. Densitometer and dosimeterb. Penetrameter and a densitometerc. IQI and a dosimeterd. IQI and fluxmeter

19. In the submerged arc welding process, the use of excessive high voltages would result in?

a. Insufficient flux meltingb. Excessive flux meltingc. Slag removal difficultiesd. Excessive spatter

20. Which of the following welding process uses a resistive heating system to achieve weld metal deposition

a. NMA b. Resistant spot welding c. Electro-slagd. Friction welding

21. Welding a steel plate with a CE of 0.45 would require preheating to? a. Prevent the formation of sulphidesb. Prevent hardening in the HAZc. Prevent the formation of carbidesd. To reduce the amount of current required

22. What does the 70 represent on an E70 10 AWS A5.1 classified electrode?

a. 70 n//mm2 min UTS b. 70 joules min impact strengthc. 70,000 P.S.I min yield strengthd. 70,000 PSI min UTS

23. Basic electrode provided in a standard packaging a. Should be baked as to manufactures recommendations prior to

used.b. The backing conditions depend upon the welder

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c. Are recommended for use where porosity free welds are required d. Are only suitable for welding in the flat, vertical, and down hand

position24. Cellulose electrodes have which of the following properties?

a. Viscous slag, large volumes of shielding gas and UTS values above 90,000 PSI

b. Large volumes of shielding gas, hydrogen contents>15 ml per 100g of weld metal deposited and should be never baked

c. Large volumes of shielding gas, high spatter contents and hydrogen levels < 15 ml per 100g of weld metal deposited

d. High spatter contents ,high deposition and large volumes of gas shield

25. From the following electrode coding E50 4 B 160 20 H5, the compulsory part is:

a. E50 4 b 160 20 h5b. B 160 20 h5c. E50 4 Bd. None of the above

26. Which of the following is applicable to electrode efficiency?a. The mass of metal deposited as a percentage of the mass core wire

meltedb. Iron powder electrodes have efficiencies above 100%c. Electrodes of high efficiencies tend to procedure welds of a smooth

flat profiled. Both a and be. All of the above

27. A fatigue cracks fracture surface is:a. Rough randomly tornb. Smoothc. Step like appearanced. Bright crystalline

28. E6014 electrode would most probably used for welding a. Low pressure pipeworkb. High- pressure pipeworkc. Vertical down welding on storage tanksd. In a situation where low hydrogen welds are specified

29. Which element in steel if present in significant amounts may lead to hot shortness

a. Phosphorusb. Manganesec. Silicond. Sulphur

MULTI – CHOICE END OF COURSE ASSESSMENT

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QUESTION PAPER (MSR-AWI-1)

1. What is the ratio between the length and the design throat thickness on a mitre fillet weld with equal leg lengths

a. 1:1b. 2:1c. 1.414:1d. It depends on the fillet welds dimensions and fit up requirements

2. What is the leg length of a fillet weld?a. The distance from the toe to faceb. The distance from the root to face centerc. The distance from the root to the toed. The distance from the toe to toe

3. Why is the arc shielded, when using an arc welding process/a. To eliminate hydrogen from the arcb. To retard the cooling rate of the solidifying metalc. To excluded the atmosphere from the arc regiond. The arc is not always shielded when using an arc welding process

4. Which of the following is applicable for a none planar defects?a. They are always repairedb. Their existence will result in the removal of the entire weldc. They are not usually as significant as planar defectsd. They can only be detected using radiography

5. Lamellar tearing is:a. A product defect cause during the manufacturing of certain steelsb. A crack type, which occurs in the parent material due to welding

strains acting in the short transverse direction of the parent material

c. A type of hot crack associated with impurities(sulphur, carbon, and phosphorous)

d. A type of crack that occurs in the weld or parent material due to cyclic stresses

6. The weld zone associated with a welded joint is :a. Weld metal, HAZ and the parent material in the immediate vicinityb. Weld metal onlyc. The weld metal plus parent materiald. HAZ and parent material

7. Which of the following elements if present in significant quantities in steel may lead to cold shortness

a. Sulphurb. Phosphorusc. Silicond. Copper

8. A black triangular flag used in conjunction with a weld symbol as to en 22553 means:

a. A specific welding process is required

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b. The weld is to be made under constant supervision of a qualified welding inspector

c. Welding to be carried out on site(field weld)d. The weld must be subjected to NDT

9. Austenitic stainless steel can be ready identified by:a. Lack of magnetic attractionb. Its extreme hardnessc. Very shinny appearanced. None of the above

10. Which of the following is likely to be considered an essential variable on a welding procedure

a. A change from an electrode classified to AWS E6011 to an electrode E6012

b. A change in preheat tem from 50oc to 150occ. A change in welding position from pa to pfd. All of the above

11. Which of the following is applicable if the heat input to high during the deposition of a weld made using the MMa welding process?

a. Low toughnessb. High susceptibility to hydrogen entrapmentc. High hardness.d. High susceptibility to lack of fusion

12. Which of the following will influence the amount of distortion on a component during and after welding

a. Heat inputb. Lack of restraintc. Material propertiesd. Both a and be. All of the above

13.when welding with the MIG welding process using pure argon as the shielding gas on carbon steel, which of the following problems are likely to occur?

a. Copper inclusions and excessive cap heightsb. Excessive root penetration and porosityc. Slag inclusions and crater piped. Lack of fusion and poor cap profiles13. It is a requirement to excavate a crack in a welded component; the

defect is at least 25 mm depth, which of the following would you expect to be done to remove the defect

a. Arc air, ground finish and checked with crack detectionb. Thermal gouging, ground finish and check with MPIc. Oxy-gas cutting, ground finish and checked with crack detectiond. Both a and be. All of the above

14. The heat affected zone associated with a fusion weld?a. Usually has the highest tensile strengthb. Always exists in a fusion-welded jointc. Is usually the area of a welded joint that is the most susceptible to

HICC?

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d. All of the above15. Which of the following welding processes would be the most suited

for the welding of carbon steel in excess of 100 mm thicknessa. Tungsten inert gasb. Electro-slagc. Manual metal arcd. Plasma arc

16. A welding process where the welding plant controls the travel speed and arc gap, but under the constant supervision using a shielding gas mixture of 80% argon –20% carbon dioxide is termed as :

a. A manual MAG processb. A semi automatic MAG processc. A mechanized MIG processd. a mechanized MAG process

17. The purpose of normalizing steela. To modify the grain structure by making it more uniform on order to

improve mechanical propertiesb. To soften a material for extensive machiningc. To reduce fracture toughnessd. To reduce ductility

18. Which of the following destructive tests would show the results in joules?

a. Tensile testb. Charpy testc. Bend testd. Hardness test

19. Generally the most suitable method of detecting lack of sidewall fusion on a single –v butt weld (30o to 35o bevel angles) would be:

a. Ultrasonic testingb. Radiographic testingc. Magnetic particle testingd. Both a and be. All of the above

20. Ultrasonic testing is preferable to radiographic testing due to a. Ability to find all defectsb. Lower amount of operator skill requiredc. Ability to detect laminationsd. None of the above

21. Lamellar tearing has occurred in a steel fabrication before welding could, which of the following test methods could have detected it?

a. Radiographic testingb. Ultrasonic c. Magnetic particled. It could not be found by any testing method

22. Incomplete root penetration is most likely due to : a. Welding speed too slowb. Welding current too highc. Root gap too smalld. Electrode diameter too small

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24. You are to oversee the arc welding of some machined fittings and that they are cadmium plated. What would you do in this situation/

a. Permit the welding to proceedb. Permit the welding to proceed with fume extractionc. Stop the operation at onced. Advise the welders to drink milk then proceed

25. On a single – V butt weld, the distance through the center of the weld from root to face is called:

a. Reinforcementb. Penetrationc. Throat thicknessd. None of the above

26. Which of the following flame types would you expect to be used for the cutting of mild steel?

a. Carburising flameb. Oxidizing flamec. Reducing flamed. Neutral flame

27. The need for the pre-heat for steel will increase if :a. The material thickness reducesb. Faster welding speedsc. The use of the larger welding electroded. All of the above

28. The main reason for toe blending on certain welded steel components is :a. Corrosion considerationsb. Fatigue lifec. Appearanced. All of the above

29. Which of the following welding process require a drooping characteristic power source

a. TIG and MMAb. MIG/MAG and MMAc. TIG and sawd. All of the above

30. When considering the MIG/MAG welding process which of the following metal transfer modes would be the best suited to the welding of thick plates over 25 mm, flat welding position

a. Dip transferb. Pulse transferc. Spray transferd. Globular transfer

MSR-WI-11. which of the following butt-weld preparations is usually the most susceptible to lack of sidewall fusion during the metal arc process ?

a. a double-u buttb. a single-V buttc. a double V buttd. it is normally a defect associated with the MMA welding process

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2. what is the leg length of a fillet weld ? a. the distance from the toe to faceb. the distance from the root to face centrec. the distance from the root to the toed. the distance from the toe to toe

3. what is the throat thickness of a fillet weld ( equal leg length ) ? a. the distance from the toe to the faceb. the distance from the root to the face centrec. the distance from the root to the toed. the distance from the toe to toe

4. lap joints contain : a. fillet weldb. corner jointc. butt-weldd. single-bevel butts

5. a duty not normally undertaken by a welding inspector is to : a. check the condition of the parent materialb. check the condition of the consumablesc. measure residual stressd. check calibration certificated

6. under most conditions, which of the following welding positions will deposit the most weld metal.

a. vertical downb. overheadc. horizontal-verticald. flat ( down hand )

7. what mean by the term crater pipe :a. another term for concave rootb. another term given for a burn throughc. a type of gas pore, found in the weld craterd. a shrinkage defect, found in the weld crater

8. what mean by the term weld junction ? a. the area containing the HAZ and the weld metalb. the weld metal and the parent metalc. the boundary between the fusion zone and the HAZd. the part of the weld, which has undergone metallurgical change due to

the heat from welding9. the strength if the fillet weld is primary controlled by :

a. leg length b. throat thicknessc. weld thicknessd. all of the above

10. a crater crack may also be termed : a. cold crackb. tearingc. fatigue crackd. star crack

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11. which of the following welding processes / technique is likely to be used for the repair welding of localized porosity in a butt weld

a. MMA, PG positionb. Mechanised MAG c. Submerged arcd. All of the abovee. None of the above

12. . which of the following welds would be considered in a situation where two plate are to be joined that overlap ( assume no external assess )

a. a fillet weldb. a single – bevel butt weldc. a plug weldd. a single – U butt weld

13. in the MMA welding process, . which of the following is most likely to be caused by a welder with a poor technique ?

a. deep weld craters/ crater cracksb. copper inclusionsc. hydrogen cracksd. all of the above

14. root concavity is caused by : a. excessive back purge pressure and entrapped gasb. excessive back purge pressure and very high heat inputsc. excessive root grinding and a slow travel speedd. excessive root grinding and excessive back purge pressure

15.when inspecting a critical component, the toes of a weld must be : a. always ground flushb. must always overlap at least 1.5 mm onto the parent material;c. must always be inspected using a crack detection method ( MPI, DPI ) d. none of the above can be selected- specification requirements

16. when carrying out visual inspection, the specification makes no mention of the requirements for visual inspection, in this situation what should you do /

a. carry out normal visual inspectionb. seek advice from higher authorityc. carry out no visual inspectiond. re- write the requirements of the specification

17. under most circumstances, which of the following do you consider to be duties of a welding inspector

a. the supervision of weldersb. procedure writingc. qualifying welder d. all of the above

18. which of the following is most likely to cause a burn througha. root gap too smallb. travel speed too fastc. root face too small d. all of the above

19. in an arc welding process, which of the following is the correct term used for the amount of weld metal deposited per minute ?

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a. filling rateb. deposition rate c. weld deposition d. weld duty cycle

20. what is the term given for the area of a welder joint just outside the weld metal that has undergone micro structural change ?

a. heat affected zoneb. the weld zonec. fusion zoned. all of the above terms may be used

21. when carrying out visual inspection, which defect (s) is likely to be missed ?

a. linear misalignmentb. cap undercutc. porosityd. lack of fusion ( inter run )

22. cold lapping is another term for : a. lack of fusion at the toe of a weldb. lack fusion between weld metal and weld metalc. undercut at the toe of a weld d. both a and b

23. incomplete root penetration is most likely due to : a. welding speed too slowb. welding current too high c. root gap too small d. electrode diameter too small

24. crater crack is are caused mainly by : a. excessively fast welding speedsb. improper electrode anglec. hot shrinkaged. improper joint design

25. on a single-V butt weld, the distance through the center of the weld from root to face is called :

a. reinforcement b. penetrationc. throat thickness d. none of the above

26. the throat thickness of a ¾ inch fillet weld is ? a. 27.5mmb. 24mmc. 13.5mmd. 12.5mm

27. the need for pre-heat for steel will increase if : a. the material thickness reducesb. faster welding speeds c. the use of a larger welding electroded. all of the above

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28. which of the following butt weld preparations is most likely to be considered for the welding of a 6mm thick plate ?

a. double –V buttb. asymmetrical double –V buttc. single U buttd. single –V butt

29. a welding inspectors main attributes include : a. knowledgeb. honesty and integrityc. good communicatord. all of the above

30. a code of practice for visual inspection should cover : a. before, during and after welding b. before welding activities onlyc. after welding activities only d. none of the above

MSR-WI-31. The likelihood of a brittle fracture in steels will increase with :

a. the formation of a fine grain structureb. a reduction in-service tem to sub-zero conditionsc. a slow cooling rate d. all of the above

2. hydrogen cracking in a weld zone is most likely to occur when welding : a. carbon manganese steelsb. austenitic stainless steelc. micro alloyed steel ( HSLA) d. low carbon steel

3. preheating for arc welding applied to : a. assembly and tack welding only b. joint over 25 mm thick onlyc. assembly welding onlyd. when using the MMA welding process only e. both a and b

4. which of the following destructive tests would indicate the toughness value of the weld metal/parent metal and HAZ

a. macrob. nick breakc. tenstiled. charpy vee notch

5. what constituent is needed in a coating of an electrode to prevent the formation of porosity when welding rimming steel ?

a. iron powder b. potassium silicatec. silicond. calcium carbonate

6. welds made with high heat inputs show a reduction in one of the following properties ?

a. ductility

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b. toughnessc. elongationd. penetration

7. which of the following steel types would give rise to the formation of porosity when autogenously weld with an arc welding process

a. fully killed steelb. semi killed steel c. rimming steel d. balanced steel

8. which of the following elements, which may be added to steel. Has the greatest affect on creep strength

a. tungstenb. manganesec. carbond. molybdenum

9. the HAZ associated with a fusion weld a. can not be avoidedb. usually has the highest tensile strength c. is usually martensitic d. both a and be. all of the above

10. what four criteria are necessary to produce hydrogen induced cold cracking ?

a. hydrogen, moisture, martensitic grain structure and heatb. hydrogen, poor weld profiles, tem above 200 oC and a slow cooling

ratec. hydrogen, a grain structure susceptible to cracking, strees and a tem

below 200oC .d. hydrogen, existing weld defects, stress and a grain structure

susceptible to cracking. 11. a carbon equivalent (CE) of 0.5% :

a. is high for carbon manganese steel and may require a preheat over 100oc.

b. is generally significant for carbon for manganese steels and is certainly not to be taken into consideration for preheat tem.

c. Is high for carbon manganese steels and may require a preheat tem over 300oc as to avoid cracking

d. Is calculated from the heat input formula.e. Is calculated from the heat input formula

12. in a martensitic grain structure what would you expect to increase ?a. ductilityb. hardnessc. toughnessd. all of the above

13. what do you understand by the term minimum interpass tem ?a. min post weld heat treatment applied to a weldb. min stress relief tem

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c. the lowest tem allowed during welding and between weld passesd. the lowest tem to be used during preheat

14. which of the following heat treatments on steel cools down in air from the austenite region ?

a. normalizingb. annealingc. temperingd. stress relieving

15. what is the purpose of microscopic exam of a weld ? a. to determine the number and type of defects presentb. to determine the grain sizec. to determine the strength of the weldd. both a and be. all of the above

16. which of the following units could a tensile specimen be measured in?a. pounds per square inchb. Newton per square inchesc. Joulesd. Both a and b

17. assuming that the welding process, material thickness, carbon equivalent and the welding parameters to be the same, which of the following joint types would normally require the highest preheat tem

a. edge jointb. lap jointc. butt joint (single-V)d. tee joint (fillet welded)

18. austenitic stainless steels are more susceptible to distortion when compared to ferritic steels this is because :

a. high coefficient, low thermal conductivityb. high coefficient, high thermal conductivityc. low coefficient, high thermal conductivityd. low coefficient, low thermal conductivity

19. which of the following will most likely require the preheat tem to be increase ?

a. an increase in travel speedb. a reduction in a material thicknessc. an increase in electrode diameterd. none of the above

20. which of the following properties may be applicable to a carbon steel weld (CE 0.48 ) welded without preheat ?

a. narrow heat affected zone and hardness value in excess of 400 HVb. broad heat affected zone and hardness value in excess of 400 HVc. a very tough and a narrow heat affected zoned. narrow heat affected zone and low hardness values

21. which of the following materials is considered to be the easiest to weld ? a. mild steelb. medium carbon steelc. martensitic stainless steel

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d. forging steel22. which of the following NDT method would be best suited for the detection of surface breaking defects on an austenitic stainless steel pipe

a. MPIb. UTc. DPI d. All of the above can be used

23. which of the following butt weld preparations would be considered for a mechanized welding process

a. single-V butt, root gap 2.5 mm ( welded from on side only ) b. double-V butt welded both sides, root gap 2.0mmc. single-U butt backingd. none of the above can be used for mechanized welding

24. which is the correct heat input for the following parameters, amps 350, volts 32 and the travel speed 310 mm/minute (MMA welding process) ?

a. 2.16kj/mmb. 0.036 kj/mmc. 2160kj/mmd. 3.6kj/mm

25. assuming that the applicable specification makes no mention of arc strikes, what would you expect to do as a welding inspector if arc strikes were found on a component made of a high tenstile strength material

a. have the welder re-qualifiedb. ignore themc. have the area checked for possible crackingd. cut out the entire weld where the arc strikes exist

26. a multi—pass MMA butt weld made on a carbon steel consists of 5 passes deposited using a 6mm diameter electrode. A 12-pass weld made on the same joint deposited using a 4mm diameter electrode on the same material will have :

a. a lower heat input and a higher degree of a grain refinementb. a lower heat input and a coarse grain structurec. a lower amount of distortion and a higher degree of a grain refinementd. a higher amount of distortion and a lower degree of a grain refinement

27. what is the purpose of a tensile test ? a. to measure ultimate tensile strengthb. to measure the elongation of a materialc. to measure the yield strength of a material.d. All of the above

28. which of the following mechanical tests can be used to give a quantitative measurement of weld zone ductility ?

a. tensile testb. bend testc. charpy V notch testd. all of the above

29. which of the following are reasons for applying preheat ? a. the removal of residual stressb. to aid slow cooling and reduce the carbon content

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c. to reduce the chance of a brittle grain structure and to reduce the chance of hydrogen entrapment

d. increase the ultimate tensile strength values and increase overall weld ability

30. which of the following are true with regards to a charpy testa. it’s a static test used to determine a materials notch toughness in the

weld regionb. it’s a dynamic test used to determine a materials notch toughness in

the weld regionc. it’s a destructive test to give a measurement of through thickness

ductilityd. none of the above.

MCQ 001A1. when’ hydrogen control’ is specified for a manual metal arc welding project the electrode would normally be :

a. cellulosicb. iron oxidec. acidd. basic

2. you would certainly recognize a hydrogen controlled flux covered electrode from its :

a. colourb. lengthc. trade namee. AWS/BS639 code letter

3. when manual metal arc welding is being carried out on an open construction site, which group of welders are the most likely to require continuous monitoring ?

a. concrete shuttering welding teamsf. pipe welding teamb. plater weldersc. plant maintenance welders

4. you notice manual metal arc electrodes, stripped of flux, are being used as filler wire, for TIG welding. You would object because :

a. it is too expensiveb. the wire would be too thickg. the weld metal composition may be wrongc. the wire is too short

5. when open site working, serious porosity in metal arc welds is brought to your attention. What would you investigate ?

a. electrode typeb. power plant typeh. electrode storagec. day tem

6. the steel composition in a structural contract is changed from 0.15% carbon, 0.6% manganese, to 0.2% carbon, 1.2% manganese. Might this influence the incident of :

a. porosity

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i. cracking in the weld areab. undercut for fillet welds c. lack of root fusion defects

7. one of the following alloys is non – magnetic. Which a. 4.0% chromium molybdenumb. 12.0% chromiumj. austenitic stainless steelc. 9.0% nickel steel

8. when the TIG welding austenitic stainless steel pipe, argon gas backing is called for. This is to :

k. prevent oxidationa. prevent under bead crackingb. prevent porosityc. control the penetration bead shape

9. pre-heating the carbon steel manual metal arc welding is carried out to minimize the risk of :

a. scattered porosityb. worm hole porosity l. parent metal crackingc. lack of penetration

10. in UK practice, BS499 Part 2 specifies that the drawing dimension quoted for a fillet weld is the ;

m.leg length a. actual throat thicknessb. weld width

11. for open site manual welding the following equipment is available. Which would you choose for safe working ?

a. single operator transformerb. multi operator transformerc. AC/DC composite power unitn. Diesel engine driven motor generator

12. if submerged arc welding is to be used to make butt welds, which would you most critical of :

o. the root gap tolerancea. the angle of preparationb. the root face widthc. the gas cut finish

13. during CO2 welding, the arc length is most likely to be affected by : a. the wire diameterp. the current return connectionsb. the gas flow ratec. the torch to work angle

14. pre-heating for arc welding applies to : a. assembly welding onlyq. assembly and tack weldingb. joints over 25mm thick onlyc. cruciform welds only

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15. you see a welder using an oxy-acetylene flame with a long feathered inner cone. What would be the effect of this on a carbon steel.

r. the weld could be hard and brittlea. the weld metal could be too softb. there will be no effect on the weldc. the weld will have undercut

16. a welder qualification test is to verifys. the skill of the weldera. the quality of the materialsb. the non-destructive test proceduresc. the manufacturing methods

17 a fabricating procedure calls for fillet welds to be ‘blended in’ by grinding. This is to influence :

a. HAZ crackingt. Fatigue lifeb. Residual stressc. Yield strength

18. bend test specimens have been taken from a 25mm thick carbon steel butt weld. Which would show lack of inter-run fusion :

u. side benda. root bendb. face bendc. guided bend

19. lamellar tearing has occurred in a steel fabrication. BEFORE welding could it have been found by :

a. X-ray examb. Dye penetrantc. Ultrasonic inspectionv. It would not have been found by any inspection method

20. you are to oversee the arc welding of some machined fittings and find they are cadmium plated. Would you :

a. permit to proceedb. permit to proce4ed with fume extractionw. stop the operation at oncec. advise the welder to drink milk and proceed

MCQ 0041. Movement of the arc by magnetic forces in MMA welding is termed :

a. arc deviationb. arc misalignmentx. arc blowc. arc eye

2. a metallurgical problem most associated with submerged arc welding is : a. hydrogen cracking in the HAZy. solidification cracking in the weld metalb. hydrogen cracking in the weld metalc. lamellar tearing in the weld metal

3. oxy pressure and nozzle size would influence what in flame cutting :

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a. the tem require for cut initiationb. the ability to cut stainless steelsz. the depth of cut obtainablec. none of the above

4. the main usage of arc cutting/gouging processes is in : a. the cutting of single bevel preparationsaa. the removal of deposited weldsb. the cutting of single U-type preparationsc. the cutting/gouging of none-ferrous materials only

5. which of the following processes joints metals plasticallybb. friction weldinga. resistance weldingb. plasma weldingc. all of the above

6. which electrode classification would be relevant to AWS A5.1-81 : cc. E 6013a. E 5133b. E 7018 – G c. Fleet weld 5

7. which of the following coatings is associated with ‘stove’ welding a. rutileb. cellulosicc. basicd. 0xidising

8. a common gas/mixture used in MIG welding nickel alloys to combine good levels of penetration with good arc stability would be :

dd. 100% CO2a. 100% argonb. 80% argon 20%CO2ee. 98% argon 2% oxygen

9. the type of SAW flux is more resistant to moisture absorbtion: a. fusedb. agglomeratedc. basicd. all of above the same resistance

10. the flame tem of oxy/acetylene mixture gas is given as : a. 3200ocb. 2300occ. 5000ocd. none of the above

11. a large grain structure in steels is said to produce : a. low ductility valuesb. low fracture toughness valuesc. high fracture toughness valuesd. high tensile strength

12. the likelihood of brittle fracture in steels will increase with : a. a large grain formation b. a reduction of in-service tem to sub zero levels c. ferritic rather than austenitic steels

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d. all the above13. repair welding is often more difficult than production due to :

a. the material being ingrained with in-service contaminatesb. restricted access within the repair areac. the possible position of the weld repaird. any of the above

14. hydrogen cracking in the weld metal is likely when welding a. carbon manganese steelb. stainless steelsc. micro alloyed steels (HLSA) d. low carbon steels

15. EN standard 288 would refer to which of the followinga. welder approval testing b. welding equipmentc. welding procedure approvald. consumable for submerged arc welding

16. porosity is caused by : a. entrapped slag in the solidifying weldb. entrapped gas in the solidifying weldc. entrapped metallic inclusion in the solidifying weldd. none of the above

17. in a bend test, the face of the specimen is in tension and root is in compression; the type of test being carried out would be :

a. a root bend testb. a side bend testc. a face bend testd. none of the above

18. ultrasonic testing is of advantage in detecting which of the following weld imperfections over other NDT methods :

a. lack of side wall fusion b. surface undercutc. incompletely filled groove d. overlap

19. the process of tempering is often carried out to regain toughness after which of the following processes :

a. annealingb. normalizingc. hardeningd. stress relieving

20 the presence of iron sulphide in the weld metal is most likely to produce which of the following upon contraction of the weld :

a. solidification crackingb. hydrogen crackingc. inter granular corrosiond. stress corrosion cracking

MCQ 0031. the British code for Visual Inspection Requirements is :

a. BS 4872

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b. BS 499c. BS 4870d. None of the above

2. a code of practice for visual inspection should cover the following a. before, during and after welding activitiesb. before welding activities onlyc. after welding activities onlyd. none of the above

3. incomplete root penetration in a butt joint could be caused by : a. excessive root face widthb. excessive root gap sizec. low current settingd. both a and c

4. incomplete root fusion would certainly be caused by a. linear misalignmentb. incorrect tilt anglec. differing root face widthsd. all of the above

5. when visually inspecting a completed single vee butt weld cap you would certainly assess

a. cap heightb. toe blendc. weld widthd. a, b and c

6. you notice a very ‘veed’ ripple shape. This is most likely caused by : a. poor consumable choiceb. welding positionc. excessive travel speedd. all of the above

7. ‘toe blending’ is important as it may affecta. corrosionb. fatigue lifec. overlap type defectsd. all of the above

8. slag inclusions would occur with a. manual metal arcb. metal inert gasc. submerged arc weldingd. both a and c

9. undercut is principally caused by a. excessive ampsb. excessive voltsc. excessive travel speedd. all of the above

10. undercut is normally assessed by a. its depthb. its length c. its blendingd. all of the above

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11. a welding procedure is useful to : a. give information to the welderb. give information to the inspectorc. give ‘confidence’ to a productd. all of the above

12. an essential variable may : a. a change the properties of the weldb. influence the visual acceptabilityc. require re-approval of a weld procedured. all of the above

13. a magnifying glass may be used during visual inspection but BS 5289 states that its magnification should be :

a. up to 5b. 2-2.5c. 5-10d. none of the above

14. when visually inspecting a fillet weld, it would normally be ‘sized’ by : a. the leg length b. the actual throat thicknessc. the design throat thicknessd. both a and c

15. a planar defect is a. incomplete fusion defectsb. slag inclusionc. incomplete penetrationd. both a and c

16. penetrate inspection and magnetic particle inspection are mainly used to a. aid visual inspectionb. because the application standard says so c. to confirm ‘ visual uncertainties’d. all of the above

17. defects outside of the limits specified in a standard should always be : a. repairedb. reported to a senior personc. assessed along with other defectsd. all of the above

18. MIG welding tends to be susceptible to lack of fusion problems. This is because of :

a. poor maintenance of equipmentb. incorrect settingsc. poor interun cleaningd. all of the above

19. manual metal arc electrodes can be grouped into three main types. These are

a. basic cellulocis and rutileb. neutral cellulosic and rutilec. basic cellulosic and neutrald. none of the above

20. ther main causes of porosity in welded joints are

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a. poor accessb. loss of gas shieldc. dirty materialsd. all of the above

21. cracks in welds may be due to a. solidification problemsb. hydrogen problemsc. excessive stressesd. all of the above

22. a ‘weave technique’ may give rise to a. better profilesb. improved toe blendingc. improved ripple shaped. all of the above

23. with reference to a root penetration bead, you could certainly assessa. root fusion and penetrationb. root concavityc. burn throughd. all of the above

24. a fatigue failure is characteristic by the appearance of the fracture surface. It would be :

a. rough and tornb. chevron – likec. smoothd. none of the above

25. stray arcing may be regarded as a serious defect. This is because : a. it may reduce the thickness dimension of a component b. it may cause liquation cracksc. it may cause hard zonesd. all of the above

26. overlap in welds could be influenced by a. poor welding techniqueb. welding processc. welding positiond. all of the above

27. flame cut preparations may, during welding, increase the likelihood of a. cracking b. misalignment problemsc. inclusionsd. all of the above

28. macroscopic exam requires any specimen to be inspecteda. once, after etchingb. twice, before and after etchingc. using a microscoped. none of the above

29. which of the following may be classed as a more serious defect a. slag inclusionsb. fusion defects (interun)c. fusion defects (surface )

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d. porosity30. a code of practice is :

a. a standard for workmanship onlyb. a set of rules for manufacturing a specific productc. levels of acceptability of a weldment d. none of the above

END OF COURSE MULTI CHOICE PAPER (MCQ.002)1. 2.3. What two functions in arc welding must be in equilibrium to enable a stable arc to be established?

a. Arc voltageb. Currentc. Wire-electrode feed rated. Metal burn- off rate

4. In MMA welding, what parameter is used for the control of penetration into the base material

a. Voltageb. Welding speedc. Iron powders in coatingd. Current

5. In the welding of a butt joint made from one side, which of the following controls the profile of the root bead?

a. Root faceb. Bevel anglec. Root gapd. None of the above

6. What type of power source characteristic is require for manual welding?a. Constant voltageb. Flat characteristicc. Drooping characteristicd. Motor generator

7. Which one of the following destructive tests wo8ld indicated the toughness of weld metal – HAZ

a. Marcob. Nick breakc. Hardnessd. Charpy Vee Notch

8. Degreasing components are essential for quality welding but some agents may

a. Cause corrosion problem b. Give off phosgene gas c. Leave residuesd. All of the above

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9. Which of the following chemical elements has the greater effect on the harden ability of a steel plate/

a. Molybdenumb. Chromiumc. Titaniumd. Carbon

10. In mag/co2 welding, which parameters give the greatest control of weld appearance during dip transfer or short circuiting welding?

a. Wire stick-out lengthb. Amperagec. Wire feed speedd. Inductance

11. In MMA welding, the slag produced can be varied to suit the welding position; which type of slag would be required for welding in the HV position?

a. Fluidb. Viscousc. None of the aboved. Semi fluid

12. The weld metal deposit of manual metal arc electrodes achieves its mechanical strength through?

a. The core wire b. The flux coatingc. Iron powders with the flux coating

13. What constituent is needed in a coating of an electrode to prevent the formation of porosity in welding of a rimming steel?

a. Iron powdersb. Calcium fluoridec. Silicond. Calcium carbonate

14. Welds made with high heat inputs show a reduction in one of the following properties?

a. Ductilityb. Toughnessc. Fatigue strength d. Mechanical strength

15. In the welding of austenitic pipe work, the bore is usually purged with Argon to ?

a. Prevent formation of porosity in the weldb. Prevent burn-through in the root runc. Prevent oxidation of the root beatd. Eliminate the formation of H2

16. In x-ray work, the quality of the radiographic negative is assessed by the ?a. Density of the filmb. IQI indicatorc. KVA availabled. Stand-off distance

17. A steel described as qt will have improved tensile properties because it has?

a. Had control of chemical composition

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b. Been heat-treatedc. Been quality testedd. Been vacuum melted

18. Which one of the following type of steels would give rise to the formation of porosity when autogenously welded with an arc process?

a. Fully killed steelb. Semi killed steelc. Rimming steeld. Fine grained steel

19. In submerged arc welding, the use of excessively high voltage would result in?

a. Insufficient flux meltingb. Excessive flux meltingc. Slag removal difficultiesd. Spatter

20. The use of cellulose electrodes is often made when welding the root pass of pipes in the field. This is because?

a. Hydrogen control is neededb. Iron powders in the electroded. Higher arc voltage can be obtainede. Shorter arc length can be achieved

21. In the welding of austenitic stainless steels, the electrode and the plate material can be purchased with low carbon contents. The season for this is to prevent?

a. Cracking the HAZb. The formation of chromium carbidesc. Cracking the weld metald. Distortion

22. Submerged arc fluxes can be supplied in two forms; these are?a. Sintered and agitatedb. Agitated and fused c. Crushed and agglomeratedd. Fused and agglomerated

23. In the steel which has improved creep properties at elevated tem, which one of the following elements helps in this improvement?

a. Tungstenb. Manganesec. Molybdenumd. Carbon

24.Welding a steel plate of a CE of .45 would require preheating to ?a. Prevent the formation of sulphidesb. Prevent hardening in the HAZ c. Prevent the formation of carbidesd. To improve mechanical properties in the weld

25. Which of the following processes uses the ‘ KEYHOLING ‘ system of fusion?a. Friction welding b. Diffusion bonding

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c. Electron beam welding d. Autogenously TIG welding

26. In friction welding, is the metal at the interface in the?a. liquid stateb. Solid statec. Plastic stated. Elastic state

27. Welding procedures may require welds to be deposited at a controlled rate heat input. High heat input would?

a. Have poor profileb. Have larger grain sizec. Have high hardness in the HAZd. Have low elongation properties

28. In a tensile test, a brittle material would be indicated if the fracture surface?

a. Shows a reduction in sizeb. Is flat and featurelessc. Breaks in the weld metald. Breaks in the parent metal

29. What destructive test would be required to ascertain the likelihood of cracking in the HAZ of a weld?

a. Nick breakb. Side bend testc. Charpy impactd. Marco test

30. In submerged arc welding, excessive arc voltage may cause?a. Excessive penetrationb. Change in weld metal compositionc. Narrow weld widthd. Excessive bead profile

WELDING INSPECTION, STEELS- WIS 5MULTI CHOICE QUESTION PAPER (MSR-WI-2 )

1. defects outside the permissible limits of the applicable specification should be :

a. the decision is up to the welding inspectorb. repairedc. always double checked using NDTd. all of the above

2. electrodes used in manual metal arc welding can be grouped in to three main types, these are :

a. oxidizing, basic and rutileb. cellulose, basic and acidicc. granular, rutile and basicd. rutile, basic and cellulose

3. movement of the arc by magnetic forces in an arc welding process is termed :

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a. arc deviationb. arc misalignmentc. arc blowd. stray arc

4. a crack type most associated with the submerged arc welding process is : a. hydrogen cracking in the HAZb. solidification crackingc. lamellar tearingd. fatigue cracking

5. which of the following processes joints metals plasticallya. friction weldingb. resistance weldingc. arc weldingd. plasma weldinge. all of the above

6. what type of power source characteristic is required for a manual process ?a. constant voltageb. flat characteristicc. drooping characteristicd. none of the above

7. which of the following electrodes and current type may be used for the TIG welding of nickel and its alloys ?

a. cerium electrode, DC – veb. zirconium electrode, ACc. thorium electrode, DC + ved. all of the above may be used

8. what are the possible results of having a heat input to low ? a. an increase in hardness, lower yield strength and lack of fusionb. a reduction in toughness , hydrogen entrapment and an increase in

hardnessc. entrapped hydrogen, an increase in hardness and lack of fusiond. entrapped hydrogen, a reduction in carbon content and lack of fusion

9. the main reason for using a back purge when welding 18-8 stainless steel with the TIG welding process is to :

a. improve positional weldingb. prevent the possibility of porosityc. prevent excessive root penetrationd. prevent the formation of a dense oxide layer forming in the root

10. the possible effects of having a travel speed too fast :a. low toughness, slag inclusions and cap undercutb. high toughness, slag inclusions and a narrow thin weld beadc. high hardness, excessive deposition and cold lapsd. low toughness, poor fusion and slag inclusions

11. if arc blow exists when welding with the MMA welding process, this can be best reduced or eliminated by :

a. a change from AC to DC currentb. a change from DC to AC current

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c. a change from DC + ve to DC – ved. a change from DC - ve to DC + ve

12. when welding a double- V butt weld with the submerged arc welding process the presence of center line porosity may be due to :

a. damp fluxb. contamination on the weld preparationsc. incorrect flux depthd. all of the above

13. the inclusion of an inductance in the welding circuit when using MIG/MAG welding process is to ;

a. control the rate of patter in the dip transfer modeb. it enables the welder to weld in position with the spray transfer modec. it allow for thicker fillet wires to be used ( 2.6-3.6 mm diameter )d. it allow full control over droplet size in the spray transfer mode

14. an undesirable property of aluminum oxide residue, when welding is that it :

a. decrease weld pool fluidityb. require more heat to melt it when compared to aluminumc. cause the welder to travel to quicklyd. the presence of the oxide makes aluminum impossible to weld

15. which of the following welding process is most likely to be used for the welding of a small diameter stainless steel pipe, 6mm – wall thickness ?

a. GTAWb. SMAWc. GMAWd. Submerged arc welding

16. when considering the tungsten arc welding process what is the purpose of the down-slope (slope-out ) control

a. ensure good penetrationb. to prevent arc striking on the parent materialc. to help prevent the formation of crater pipe and possible crackingd. to help prevent tungsten inclusions during welding

17. when considering thermal cutting local hardening can be reduced by : a. increasing the cutting speedb. the use of propane as a fuel gasc. pre-heating the material to be cutd. all of the above

18. in a semi-automatic welding process, which of the following shielding gas/gas mixtures would normally give the deepest penetration on steel ?

a. 100 % argonb. 100% co2c. 75% argon + 25 % CO2d. all of the above give the same depth in penetration

19. in MMA welding process, which of the following statements are false ?a. an arc gap, which remains almost constant even if as usual the welder

varies the position of the electrodeb. a voltage, which remains almost constant even if as usual the welder,

varies the arc gap

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c. a current, which remains almost constant even if as usual the welder, varies the arc gap

d. a and be. all of the above

20. . which of the following welding process, after the weld is completed normally require a post weld heat treatment to restore toughness values

a. ESWb. MMAc. MAGd. All completed welds require a post heat treatment, regardless of

welding process 21. . which of the following current types would you expect to be used for the welding of aluminum with the TIG welding process

a. DC –veb. DC+ vec. ACd. All of the above

22. . which of the following statement is false ? a. in the MMA welding process electrode DC + produces a deep narrow

weld pool, which is fast freezingb. DC electrode positive is used for the MAG welding of steel platec. The word calcium carbonate means limestoned. All of the above

23. when considering hydrogen, which of the following welding process would produce the lowest levels in the completed weld ( under controlled conditions )

a. MMAb. SAWc. TIGd. FCAW

24. pre-heat prior to the welding of carbon steel butt weld : a. must always to carried outb. is always carried out using a gas flamec. need not be carried out if post weld heat treatment if to followd. none of the above

25. in steel the element with the greatest effect on hardness is a. chromiumb. manganesec. carbond. nickel

26. for a given voltage and current settings on a MMA welding plant, when the arc length is shortened, which of the following will be most affected

a. the current will increaseb. the current will decreasec. the voltage will decreased. the voltage will increase

27 which of the following best describes a semi-automatic welding process ? a. the welder is responsible for the maintaining the arc gap and travel

speed

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b. the welder is responsible for travel speed only; arc gap is kept constant by the welding plant

c. both travel speed and arc gap is controlled by the welding plated. all of the above

28. what is purpose of a rectifier in a welding sates electrical circuit ? a. to keep the arc stable when using low current settingsb. to convert AC current to DC currentc. to convert DC current to AC currentd. to initiate the arc at start up

29. when calibrating a mechanized MAG welding plant, which of the following applies (WSF = wire feed speed) ?

a. check – WFS, current, volts and wire diameterb. check – WFS , joint set up, gas flow rate and WFSc. check – gas flow rate, stick out length, WFS and current d. all of the above

30. the main usage of the arc air process is : a. the cutting of weld preparationb. the removal of defective weldsc. for the cutting of non-ferrous materials onlyd. for the cutting of ferrous materials only

FINAL ASSESMENT MULTIPLE-CHOICE QUESTIONCSWIP 3.1 WELDING INSPECTOR COURSE

Mfy- 001ALL THE QUESTIONS TO BE ATTEMPTED

EXAM TIME : 30 MINUTES

1.which of the following does not contribute to hydrogen cracking : a. external forces on the weldmentc. amount of hydrogen in the weldd. residual stresses in the welde. size and length of linear discontinuities

2. for the arc air carbon cutting process the air is a. Use for cooling the electrode onlyc. produced through the chemical reaction of the electrode and the base

metald. supplied through air ports in the electrode holder and directed along

the electrode e. supplied by another torch also by other operator

3. acetylene hoses are distinctly difference from oxygen hoses. Why ? a. because the internal diameters of the two are different.b. because of operating pressure differences between fuel gas and

oxygenc. acetylene attacks the materials used in oxygen hoses

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d. to prevent accidental interchange4. which of the following can result in a hard and brittle condition resulting from rapid cooling

a. arc strikesb. excessive weld reinforcementd. excessive spattere. slag inclusion

5. DC negative when use for MIG/ MAG can give the smooth arca. trueb. false

6. in which of the following process is the use of pressure required to successfully joint the materials:

a. TIG b. MMAc. SAWd. Stud welding

7. which of the following will contribute significantly to lack of fusion a. incorrect joint designb. incorrect welding techniquec. heavy scale on the joint surfaced. all of the above

8. which of the following process used loose granular fluxa. FCAWb. SAWc. GTAWd. SMAW

9. Crack Tip Open Displacement test is used to measurea. strength of the material being testedb. hardness of the materialc. the toughness of the materials, resistance to crack extension and the

acceptable flaw size alld. ductility of the material being tested

10. The pulsed MIG/MAG mode of transfer is a variation of a spray transfer mode that make used of a low background current with a higher, rapidly pulsing current superimposed on it

a. falseb. true

11. the iron carbon diagram is used by metallurgists and other to see how a. adding nickel changes the corrosion resistance of steelsb. adding carbon changes the response of the steel tem changesc. adding molybdenum increases the toughness of steeld. adding chromium improve corrosive resistance

12. the main purpose of a developer is to : a. assist in the development of the test procedureb. provide a clean surface for the penetrate indicationc. assist in the development of the penetrate indication from a defectd. assist in the drying of the penetrate

13. overlap in a fillet weld would occur: a. at some point in the weld throat

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b. only on the face of the weld d. at the toe of the welde. at the root of the weld

14. in the TIG welding process, gas shielding of the weld pool maybe provided by which gas.

a. carbon dioxideb. argon and oxygend. argon and heliume. oxygen and helium

15. welding flux : a. helps on control the tem of the pieces being weldedb. crates a temporary bond between the pieces being weldedd. protects from the atmosphere and removes the oxide film on the

surfacec. makes it easier to move the electrode

16. increasing the carbon content of steel allows a given level of hardness to be achieved :

a. at a higher cooling rateb. without consideration of the cooling ratec. without adding chromium to the steeld. at a lower cooling rate

17. which is not a factor that should be considered in selecting the best shielding gas mixture for a given application :

a. weld appearance and acceptable spatter levelb. thickness joint design and penetration requirementsc. the welder’s personal requirement d. transfer mode

18. which of the following is not considered to be cause of incomplete fusion a. welding current exceeding that specified on a WPSb. using too large an electrode for a narrow Vee c. improper manipulation of the electroded. using the wrong type of electrode

19. which is an advantage of an argon/ hydrogen gas mixture in TIG of stainless steel

a. lower heat inputb. improved toughnessc. faster travel speed d. improved mechanical properties

20. some MMA electrodes for the welding of stainless steel have a low carbon steel core wire and the alloying elements in the covering. This is because :

a. the core wire offer lower resistance to the passage of the welding current

b. the manufacturer can more conveniently include alloying elements in the covering than produce special core wires

c. both for reason a and b aboved. for some reason not listed above

21. sulphur is sometimes added to steel to improvea. the impact properties of the welded joint b. provide higher impurities levels

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c. toughness of the parent materials d. machining properties characteristics of the steel

22. slow cooling of liquid metal from high tem promotes the growth of a. medium grainsb. large grainsc. small grainsd. a combinations of large and small grain

23. a defect can best be described as ; a. all type of flaw in a weld regardless of sizeb. meaning exactly the same thing as a discontinuityc. any type of weld flawd. a discontinuity judged to possibility interfere with the fit for purpose

of the weld

24. ACC ( Drooping arc ) power source is suitable fora. MMA-TIGb. MIG/MAG – FCAW welding processc. SAW – MIG/MAGd. MMA – MIG/MAG

25. In Gas Metal Arc Welding ( GMAW ) , spray Transfer may be achieved using shielding gases containing

a. more than 85% argon b. less than 50% argon c. 100% carbon dioxided. less than 75% argon

26. when welding with a weave technique the heat input using the same welding parameters( amps and volts ) as those used for stringer bead will be

a. lower than that for the stringer beadb. unaffected because techniques has no influence on the heat inputc. will the higher than the stringer bead because the travel speed wiil be

lowerd. the same as that for the stringer bead

27. welding in cold weather conditions is mostly commonly associated with increased risk of

a. undercutb. porosityc. slag inclusiond. cracking

28. hydrogen trapped in the weldment can cause hydrogen cracking if the contents of hydrogen are too high. What is the other name commonly used to describe hydrogen cracking?

a. fissure cracksb. hot cracksc. supercritical cracksd. cold cracks

29. steel is often heat treated after it is made at the steel mill. When a steel is normalized what is the primary objective of this process ?

a. to increase the hardnessb. to decrease the amount of carbon in the steel

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c. to increase the low tem toughness of a steeld. to improve the tensile strength

30. travel speed is the rate at which the welding gun progress along the joint. As the travel speed increases :

a. the penetration is increasedb. the heat input into the joint decreased and the penetration is

decreasedc. the penetration is decreased and the weld bead becomes higher and

widerd. the heat input into the joint is increased

31. the recommended drying tem and time required producing a condition below 5 ml H2/100 grams of weld metal when using basic electrodes would be :

a. below 150oc for 1 hourb. 250oc for 1 hourc. over 350c for 1 hourd. 600c for 1 hour

MFY – OO2

1. Why is the generally good practice to aim at using the least amount of consumable materials and keep joint preparations to a minimum?

a. to increase beneficial residual stressesb. improved strength c. smaller welds generally look betterd. to reduce costs and with less weld matel there is the prop ability of

fewer weld faults2. in general, the MIG/MAG mode of transfer best suited for the welding thin sheet is :

a. short- circuiting transferb. globular transferc. spray transferd. should not use MIG?MAG for welding thin sheet

3. in general. The MIG/MAG mode transfer best suited for welding thin sheet is dip transfer

a. trueb. false

4. which of the following maybe difficult to detect with the radiographic inspection method?

a. incomplete penetrationb. discontinuities pendicular to the radiation beamc. slag inclusiond. porosity

5. The pulsed – MIG/MAG process is only suitable for welding in the flat position

a. Trueb. False

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6. When using Gas Metal Arc Welding ( GMAW ) process, straight argon may be successfully used as a shielded gas when welding the following

a. steel or aluminumb. Aluminumc. Straight argon is never usedd. Steel

7. The primary advantage of a 75% Ar,25% co2 gas mixture over pure co2 in the FCAW process is :

a. increase in welding speedsb. very significant reduction in weld spatterc. increase the heat inputd. decrease in welding speeds

8. A cause of inadequate penetration could : a. Incorrect joint preparationb. Incorrect joint designc. Incorrect welding techniqued. All of the answer provided are possible cause

9. which of the following is not a method of increasing the hardness of a steel ?

a. heat treatmentb. castingc. mechanical deformationd. introducing alloying elements

10. welding changes the properties of solid steel through ; a. mechanical changes caused by rolling b. changing the final appearance of the steel c. heating and cooling cycles associated with the welding arc and weld

metal depositd. metallurgical effects as a results of micrographs

11. tension test results are used : a. soundness of the materials being tested b. to select material for engineering applicationsc. fracture toughness of the materials being tested d. fatigue capability of the material being tested

12. which of the following may contribute to the formation of porosity in the weld deposit :

a. all of the answer provided is a contributing factorb. low welding currentc. contamination of the weld joint surfacesd. use of contaminated electrodes

13. When using the GMAW process for the welding of aluminium, the liner should made of :

a. Nylonb. Graphitec. Steeld. A liner should not be used

14. When preparing bend test specimens it is important to :

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a. use a proper etching b. prevent stress raisers by radius all edges of the specimenc. ensure the reduced section is of the correct dimensionsd. accurately place the notch in the correct position

15. steels that have intentional additions of sulphur, lead or selenium to improve machine ability :

a. can develop liquation crack in the HAZ after being weldedb. are used for trucks axles onlyc. do not require approved procedures to be weldedd. can not be welded

16.

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