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ULTRASONIC TESTING PROCEDURE

as

per

AWS D1.1 2006 Edition

GLOBAL

INSPECTION

PREPAREDY:

NDT Manager

SIGNATURE:

Date 30 Tan

2008

GLOBAL

INSPECTION

APPROVED Y:

ExecutiveDirector

SIGNATURE:

Date

30

Tan

2008

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Edition

PROCEDURE

FOR

ULTRASONIC

TESTING

(

AWS

D1.1 2006

Edition

)

TABLE OF CONTENTS

Description

1.0 Scope

2.0

Personnel

Qualification

3.0

Equipment

4.0

Equipment

PerformanceChecks

5.0 System

Calibration

6.0

Testing

Procedure

7.0 Acceptance

Rejection

Criteria

8.0

Records

9.0

Attachments

Appendix

I

Appendix

II

Appendix

II I

Appendix

IV

Appendix

V

Page

No.

4of40

4of40

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of

40

14of40-40of40

Probe

ndex of

Shear

Wave

Probe

BeamAngle

of Shear

Wave

Probe

Time-Base

inearity

Equipment

Gain

Linearity

Probe-Equipment

Combined

Resolution

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TABLE OF CONTENTS

(CONT'D)

Description

Page

No.

Appendix

VI

-

Sweep

Range

Appendix VII

-

DAC Curve

and Sensitivity

Setting

Appendix VIII

-

TransferCorrection

Ultrasonic

Test

Report Format

Ultrasonic

Test

Equipment

Performance

Checklist

Table6.2

-

Acceptable-Rejection

riteria Statically

Loaded

Table6.3

-

Acceptance-Rejection

riteria

Cyclically

Loaded

Table6.7

-Testing

Angle

Table6.7

(Cont'd)

-

Testing

Angle

Figure 6.24

-

Plan

View of UT

Scanning

Pattern

Figure 6.7

-

Class

R Indications

Figure 6.7

-

Class

R Indications

Cont'd)

Figure

K-12

-

Discontinuity

Height

Dimension

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SCOPE

1.1 This

procedure

describes he

method

to be employed

by

Global

Inspection Services Sdn

Bhd

for the Ultrasonic

Testing

in

accordance

with the following

code and standards.

AWS

D1.1:2006

1,.2 This procedure

is intended

for the inspection

of

groove

welds

on steel fabrication with parent metal thickness 8mm and

above.

It is also applies

to the testing

of steel

plate

or

pipe

for

parent

metal discontinui ties.

PERSONNEL

QUALIFICATION

All

personnel

performing

ultrasonic

testing

shall

be

qualified

and

certified

in

accordance

with the Written

Practice

or the

qualification

and certification

of personnel,

which conforms

to

ASNT

Level

II

or

PCN Level

II or CSWIPor

equivalent.

EQUIPMENT

3.1 Flaw

Detector

3.1.1

The flaw detector

shall

be Sonatest

SSLL0,

Panametric

Epoch

II or Epoch

48 or

Epoch

XT or equivalent.

3.1.2The flaw

detector

shall

be calibrated

and

certified

within

1,2months

prior to

use.

3.2 Probes

3.2.1.

A minimum

of one

(1) zero degree

probe

and

three

(3)

angle

probes

(45,60 and

70') shall

be made

available

on

each

esting.

1.0

2.0

3.0

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d i t ion

3.2.2

The recommended choice of angle probes

for scanning

different material thicknessare

as follows:-

Material

Thickness

Angle to be

Used

(* )

Dimension

(mm)

Recommended

Frequency

8-38mm

700 8x9

2

-

SMHz

38mm and

above

45o,

0o,70o

8x9

2

-

5MHz

(.) All parent materials o be scannedwith 0o,2 - 5 MHz,10

mm diameter probe prior to

angle scanning.

However, the probes

which

give

the best

responseshould

be used, dependent on

the weld,

welding parameters

and

parent materials.

3.2.3 The angle probe

shall produce

a sound

beam

in

the

material being tested

within

plus

or

minus

2o.

3.2.4 Eachangle probe shallbe clearly

marked to

indicate:

a.

frequency

(Mhz)

b. beamexit

point

c. beam ncident

angle

3.3 Couplant

3.3.1

The couplant

to be

used between

the

probe

and

inspection surfaceshall be paste and water mixture of a

suitable

consistency.

3.3.2 The same

couplant

shall be

used for

both

system

calibration and

testing

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Ed i t ion

3.4

Calibration

Blocks

The International Institute of

Welding

(IIW) V1./V2

ultrasonic

referenceblock shall be

the standard block

to be

used

for both

distanceand

sensitivity calibration.

4.0

EQUIPMENT PERFORMANCE CHECK

4|1, The type of performance

checksand

their

frequency shall

be

as

the following:

a. Horizontal

linearitv

40 hours

b. dB linearity

weekly

c. Amplifier linearity

weekly

d.

Internal reflectionof

every

8 hours

of use

of probe

e.

Probecontactsurface

beginning

of shift and

every 8

hours of

use

f. Probebeam

exit pointbeginning

of shift

and every

8 hours

of use

g.

Probebeam exit

angle

beginning

of shift

and every

8 hoursof

use

h.

Resolution

every change

of

probe

shoe

i. Ultrasonic equipment

every

12 months

certification

/

calibration

j.

Max. penefrating

power

weekly

4.2

Performance checks

shall

be conducted

on

the equipment

with

recordskept

at

QA

office

and to

be audited

by

client.

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Edit ion

SYSTEM CALIBRATION

Ultrasonic testing equipment

and

probes shall

be checked

for

the

performance.

The equipment shall

be calibrated

for the

functions

using the following

calibrationprocedure.

5.0

Appendix I

Appendix II

Appendix III

Appendix IV

Appendix

V

Appendix VI

Appendix VII

Appendix VIII

Probe ndex of Shear

Wave

Probe

BeamAngle of

ShearWave

Probe

Time-Base inearity

Equipment Gain

Linearity

Probe-Equipment

Combined

Resolution

Sweep

Range

DAC Curve

and Sensitivity

Setting

TransferCorrection

6.0 TESTING

PROCEDURE

6.'l", SurfacePreparation

6.1..1.

he condition

of atl surfaces

shall

be such

that

a

satisfactory

oupling

between

probe

and test

surfaces

an

be maintained.

6.1..2

The

visual examination

of

welding

andf ot

material

under

test shall

be carried

out

to

ascertain

any

surface

defect

or condition,

which

may

affect

the ultrasonic

examination.

6.1,.3 All spatters, loose scale, rust, coating and other

irregularities

over

the scanning

surfaces

on

any side

of

the

weld which

may

interfere

with the

transmission

of

sound

wave shall

be removed

by

wire brushing

or

light

grinding.

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Edit ion

TestingCoverage

6.2.L Welded

oints

requiring

Ultrasonic

Testing

shall be

tested

for their full

length unlessClient

specifies

partial

or

spot

testing.

6.2.2 The scanning shall

be done

from each

side of

the

weld

axis

where

possible.

The area

adjacent

o the

weld

shall

be prepared for at least 3 times the thicknessof material

being

inspected

both side of

weld

axis for

the smooth

scanning

surface.

6.2.3 The

volume

shall

be

examined

by moving

the

probe

over

test surfaces

so as

to scan the

entire

weld

volume

and

adjacent

area. Each

pass of the

probe shall

overlap

a

minimum, of

50%of the probe

dimension.

Parent

Metal Evaluation

6.31,

The entire

basemetal

through

which ultrasound

travel to

test

the weld shall

be tested

or laminar

reflector

using

a

zero

degreeprobe.

6.3.2

The scanning

shall

be performed

at sensitivity

setting

of

2"d back wall echo

to 80%

full screen

height

set

at

clean

basemetal.

6.3.3

The probe

movement

for examination

shall

not

exceed

L50mmper

second.

6.3.4 If

any of base

metals exhibits

total

loss of back

reflection

or

an indication

equal o or

greater

han

the original

back

reflection

height is

located n

a

position

that

will interface

with the normal

weld scanning

procedure,

its size,

location and depth

shall

be determined

and

reported

in

the ultrasonic

est

report.

6.2

6.3

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Edit ion

Weld Evaluation

6.4.1. The beam shall be directed

at approximately

right

angles

to the weld axis

from

two

directions

where

possible.

The

probe shall

be manipulated so

that the beam

passed

through the required

volumes

of

weld

and

adjacent

base

metal.

6.4.2 Sensitivity shall be

increased rom the

reference

evel

for

weld scanning

in accordance

with AWS DL.1

:

2006,

Table 6.2 or 6.3,as applicable.

6.4.3 The testing angle

and scanning

procedure

shall

be

in

accordance

with those shown

in AWS

D1.L : 2006,

Table

6.7

6.4.4

The probe movement

for the examination

shall

not

exceed

50mmper second.

6.4.5

For

transverse

discontinuities,

he

beam shall

be directed

approximately 5" o theweld axis.

6.4.6 Straight

Beam Scanning

-

Straight

beam scanning

of

the

adjacent base

metal shall

be performed

to

detect

reflectors that

might affect

interpretation

of angle

beam

result, and is

not to be used as

an acceptance

ejection

examination.

Locationand

areaof such

reflectors

shall

be

recorded

6.4.7 Angle

Beam Scanning

-

Angle beam

scanning

shall

be

directed at

approximate

ight angle o

the

weld axis

rom

two

directions where possible.The searchunit shall be

manipulated

so that

the ultrasonic

energy

passed

through the

entire

volumes

of

weld and

adjacent

base

metal. Scanning shall

be performed

at

a gain

setting

at

least two times

the primary

reference

evel.

Evaluation

shall

be performed

with respect o the

primary

reference

level. Selection

of probe

angle

would be governed

by

thickness of

weld and

angle of

weld

preparation.

6.4

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Edit ion

6.4.8

Butt

Joints

All

butt

joint

welds

shall

be tested

rom each side

of

the

weld axis. Corner and

T-joint

welds

shall

be primarily

tested

from

one

side of the

weld axis only.

All

welds

shall be tested using

the applicable

scanning

pattern

or

patterns shown

in AWS

D1.1 : 2006,

Figure 6.24

as

necessary

to detect both

longitudinal and

transverse

flaws.

It is intended that,

as a

minimum, all

welds

be

testedby passing sound through the entire volume of the

weld

and

the heat-affected

zone in two

crossing

directions,

wherever applicable.

6.4.9 For partial

weld penetration,

esting

and evaluation

shall

be

made up to the

weld size

as per specified

in

the

drawing.

6.4.10Maximum

Indication

When a discontinuity indication aPPearson the screen/

the

maximum attainable

indication

from

the

discontinuity shall

be adjusted

to

produce

a

horizontal

reference

level trace

deflection

on the

display.

This

adjustment

shall

be made

with the calibrated

gain

control

(attenuator),

and

the instrument

reading

in decibels

shall

be used

as the

"Indication

Level, a"

for calculating

the

"Indication

Rating,

d".

Horizontal

reference

evel

is 80%

of

full screen

height.

6.4.11,

Attenuation

Factor

The

"Attenuation

Factor,

c" shall

be

attained

by

subtracting

1 in

(25mm) from

the sound-path

distance

and multiplying

the remainder

by

2. This

factor shall

be

rounded out on

the

nearestdB

value.

Fractional

values

less than

1/z

dB shall

be reduced

to the

lower

dB

level

and those of

1/z

dB or

greater

increased

to

the

higher

level.

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Edit ion

12 Indication Rating

The

"Indication

Rating, d", represents

the algebraic

difference in decibels between the

indication level

and

the reference evel

with

the

correction or attenuation

as

indicated n the following expressions:

Instruments

with

gain

in

dB:

a-b-c=d

Instrument with

attenuation

dB:

b-a-c=d

Discontinuity SizeEvaluation

6.5.1,

Length

The length

of

indication shall

be determined

by

measuring the distance between

the probe

centerline

locations

where

the

indication rating

amplitude

drops

50To

(6

dB) below

the rating for

the applicable

classification. This

length shall be

recorded

under

"discontinuity

length" on the test

report.

6.5.2

Height

The discontinuity

height (depth dimension)

should

be

determined using

the following

methods:

(ii)

The indication

height should

be maximized

by

moving the search

unit to

and

from

the

discontinuity

in accordance

with A

of figureK-12.

The indication

height should

be adjusted

to

a

known value(e.g.,80% f full screen eightFSH).

The search

unit should

move

towards

the

discontinuity

until the

indication

height begins

o

drop rapidly

and continuously

towards

the

base

Iine. The

location of the

leading

(left) edge

of

the

indication at

location B in

FigureS.l2

in relation

to

the display

horizontal

base ine scale

should

be

6.4

6.5

(i )

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Edit ion

noted. A 0.10

nch (2.5mm)division

scale

or

metric

scaleshould

be used.

(iii)

The

search

unit

should

be

moved

from

the

discontinuity

until

the

indication

height

begins

o

drop

rapidly and

continuously

towards

the

base

line. The

location of

the

leading edge

of the

indication at

locationC

in Figure 5.12

n relation

to the

display

horizontal

baseJine

should

be

noted.

(i")

The mathematical

difference

between

B and

C

should

be obtained

to

determine

the

height

dimension

of

the discontinuity.

6.6

AWS D1.1 :

2006,

Class

R

shall

be

used

when UT

is used

as

an

alternative o

RT.

7.0 ACCEPTANCE/

REIECTION

CRITERIA

Eachweld discontinuity

shall be

accepted

r rejected

on

the

basis

of

its

indication

rating and

its length,

n conformance

with the

following.

7.1. Statically

Loaded Nontubular

Connections

AWS

D1.L :

2006'

Table 6.2.

7.2 Cyclically

Loaded

Nontubular

Connections

AWS

D'1.1' 2006

Table6.3.

7.3 Tubular

Connections

AWS Dl.1 :

2006,6.13.3J1',

lass

R

7.4 When UT

is

used

as an alternative

to RT

-

AWS

D1.1 :2006,

6.13.3.1.

lass

R.

7.5 For base

metal examination

AWS

DL.1

2006,5.15.1.1

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Edit ion

8.0 RECORDS

8.1 Identification

of Rejected

Areas

Each unacceptable

iscontinuity

shall be

indicated

on the

weld

by a mark directly

over the

discontinuity

for

its entire

length.

The depth from

the surface,

location along

the

weld

axis,

location within the cross

section,size

(or

indication

rating)

shall

be noted on

nearbv

base

metal.

8.2 Forms

For

each ultrasonic

testing carried

out,

the

following

information should

be dentified on

a

report form.

a. Client

b. Project

c. Materials

d. Procedure

Number

e. Report

Number

f . Date

g.

TestingStandard

h. Acceptance

RejectionCriteria

i.

UT

Equipment

Details

j.

Welding

Details

k. Material Thickness

l. SurfaceCondition

m. Probe

and Sensitivity

Details

n. Weld

Identification

o.

Results

k. PersonnelName,Qualification& Signature

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d i t ion

9.0

ATTACHMENTS

Appendix I

-

Probe ndex of Shear

Wave

Probe

Appendix II

-

BeamAngle of Shear

Wave

Probe

Appendix

III

-

Time-Base

inearity

Appendix IV

-

EquipmentGain

Linearity

Appendix V

-

Probe-Equipment

Combined

Resolution

Appendix VI

-

Sweep

Range

Appendix VII

-

DAC

Curve and Sensitivity

Setting

Appendix VIII

-

Transfer

Correction

Ultrasonic

Test Report

Format

UltrasonicTest

Equipment

Performance

Checklist

Table

6.2

-

Acceptable-Rejection

riteria

Statically

Loaded

Table 6.3 Acceptance-Rejection

riteria

Cyclically

Loaded

Table6.7

-Testing

Angle

Table6.7

(Cont'

d)

-

Testing

Angle

Figure 6.24

-

Plan View

of UT Scanning

Pattern

Figure 6.7

-

Class

R Indications

Figure 6.7

-

Class

R Indications

Cont'd)

Figure

K-12

-

Discontinuity

Height

Dimension

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Edition

APPENDIX

I

PROCEDURE

TO DETERMINE

THE PROBE

INDEX

OF SHEAR

WAVE

PROBE

In,VV1 - BLOCK

V2 - BLOCK

1.0

GENERAL

1..1.

IIW. V1 orV2block

may be

used.

1,.2 It

may be found

that

manufacturer's

marks

or

Probes

are

not

of

sufficient

accuracy

for the purpose

envisaged

and

the

Probe

index

is the

first probe

characteristic

which should

be checked

prior to checking he beamangle or Profile.

PROCEDURE

.0

2.1. Place the

probe

on the

block

as shown

above.

Maximized

the

signal

by

moving

the probe

backward

and

forward.

Parallel

to

the block sides.

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d i t ion

2.2 When

the signal

s at maximum

the

probe

ndex

will corresPond

to the engraved

ine on

the block

which marks

the

geometrical

centerof

the quadrant.

2.3 The

probe

index measurement

should

be repeatable

o

within

+/-

1mm.

If the

measured

position

differs

from

the

existing

mark by

more than

l"mm,

the new position

should

be

marked

on the

probe side

shall

be used

in subsequent

probe

check

and

defectplotting.

3.0

TOLERANCE

The

probe ndex shall

not differ by

*

/-

1.0mm.

4,0

FREQUENCY

OF CHECKING

This

will depend on

the

rate of

probe

wear due

to usage

and

to

the

roughness

of the

testing

surface.

When

a probe

is in continuous

use

daily

check

or at least

every

four

hours

s required.

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Edit ion

APPENDIX

II

PROCERURE

TO DETERMINE

THE BEAM

ANGLE OF

SHEAR

WAVE

PROBE

C

D

IIW V1 - BLOCK V2 - BLOCK

1.0 GENERAL

1.1

IIW. V1 or

V2 block

can be

used o

determine

he

beam

angle

of

shear

wave probe.

1,.2

The beam angle

checkshall

be

made on

probe

n conjunction

with

the

flaw detector

o be

used

n subsequent

esting.

2,.0 PROCEDURE

2.1 Place

the probe

on

Position

A to

H (depending

on

angle

of

probe)

as above

to

receive

a reflected

signal

from

the

selected

transverse

hole

in the block.

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2.2 Maximize the signal by

moving the probe

backward

and

forward.

When the signal

s maximized the beam

angle

can be

measured

using the probe

index and engraved

reference

ines on

the

block.

3.0

TOLERANCE

3.1

Accuracy

of

measuredbeam

angle shall be

+

/

-

2o

Marked

angles are normally

not accurate

or

worn-out

probes.

Measuredangle shall

be recorded

and marked on

the probe

and

used

n

subsequent

robe checks

and defect

plotting.

3.2

4.0 FREQUENCYOF

CHECKING

This will depend on the

rate of probe

wear due

to usage

and

to the

roughness

of

the testing surface.

When

a probe

is in continues

use.

Check shall be carried

out every

four hours or

daily before

production

test and the

new angle shall be

used or all evaluations.

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EVISION:0

APPENDIX

II

PROCEDURE

TO DETERMINE

THE

TIME-BASE

LINERITY OF

UT EQUIPMENT

C

25

mm

1.0 GENERAL

1..1. A compressional

wave

probe

(single or twin

crystals)

and

IIW

VL block

can be used

or this

check.

Range of

check shall

be at

last equal

to

that

which

is to be

used

in testing.

2.0

PROCEDURE

2.1, Place he

compression

wave

probe

on

Position

A

B or C

IIW

V1

block.

Adjust the

time-base

so

that the

first

and

fifth

back

walls echo

ndications.

Coincide

with particular

graticule

ine.

1,.2

100mm

I

I

J

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2.2 Beingsuccessive ackwall echoes,n turn, to approximatelythe

same height

(e.g.

80%

full screen).

The

leading edge

of

each

echo

should

lie

up

with appropriate

graticule

line.

Record

any

deviations,

measured at approximately

half full screen

height,

from the ideal positions.

2.3 For range

ess han 250mm,place

he probe

at B, the

range

greater

than

250mm,

place

he probe

at A or C.

3.0

TOLERANCE

Deviation of the base

ine linearity shall

not exceed

+

/

-

2% of the

full

Time-base ange, otherwise

recalibration

is required.

4.0 FREQUENCYOF CALTBRATION_

The check shall

be carried out

at leastonce

per

week if the unit

is used

Daily or prior to

production testing.

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APPENDIX

IV

PROCEDURE

TO DETERMINE

THE

LINEARITY

OF

EQUIPMENT

GAIN

B

100mm

9 l

mm

GENERAL

This is a check

on the

combined

result of

linearity

of calibrated

gain confrol

and the

amplifier.

Any standard

calibration

block

can be

used.

PROCEDURE

2.1

Place he

probe on

Position

A.

Adjust the

gain

to set

his signal

o

80% offull

screen

height

and the

note

the

value of

the calibrated

control

(dB). Adjust the

calibrated

confrol

to

increase

he

gain

by

2 dB.

The signal should

increase

o

full screen

height

(100%).

Restorethe gain to its original value and then reduce it by

further

6

dB.

The

signal should

fall to

40%of

full

screen

height.

Reduce he

gain by

a further

6dB.

The

signal should

fall

to

20%

of

full screen

height.

Reduce

he gain

by

a further

6 dB.

The

signal

should

fall to

10o/'of

full screen

height.

Reduce

he

gain

by

further

6 dB.

The signal

should

fall

to 5o/o

f

full

screen

height.

l - /

t r

- r \ -

- f l

. - l

I

I

I

I

1.0

1..1

1,.2

2.0

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2.2 To determine the screen

height

(amplifier) linearity.

Place he probe

on Position

B. Adjust

the probe

position

to

give

a 2:'J.

atio

of

amplitudes

between he

first and

second

back

wall

signal set

at 80%

full screen

height. Without

moving the

probe,

adjust the gain

control to successively

et the

first signal

from

20% o 100%

ull

screen

height, n L0%

or

2

dB

increments.

Read

the

amplitude of

the second

signal

at each setting.

Record

the

amplitudes

of both signals.

3.0

TOLERANCE

3.1,

Linearity of gain control.

Gain

(dB)

Limits

Expected

Screen

Height

+

2 Not

less han9l%

100

0-80

6 35%to45%

40

12

1.5%o25%

20

L8

8%to12%

L0

24

Must be

visible above

5

base

ine

3.2 Screen

Height

(Amplifier)

Linearity.

The amplitude

if

the

first (larger)

signal

must

be

twice

the

amplitude

of the

second

smaller)

signal,

within an

accuracy

of

+

/

-

5%

full screen

height.

4.0 FREQUENCYOF CHECKING

Recalibration

is

necessary

at

least once

every

month

or

when

maintenance

ervice

s carried

out on

the test

equipment.

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E d i t i o n

APPENDIX V

PROCDURE

TO DETERMINE THE RESOLUTION

oF

PROBE-EQUTPMENTCOMBINATION

C

IIW Vl BLOCK

L.0

E

IOW BEAM

PROFILE

PROBE

GENERAL

1..1. This is a check the

ability of probe-unit

combined

to

discriminate

between signals

from separate

eflectors

ying

at

only

at

only

slightly different

rangesor

near to surface.

PROCEDURE

2.1. Compression

0) probe.

2.0

2.1,.1,Place the probe

on

Position A. Three

signals

from

the

85mm,91mm

and

L00mmshould

be clearly

displayed.

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2.1,.2Position

B and C

is to determine

the

near

surface

resolution

at the dead

zone of the

probe.

If the

reflection

from the Perspex

disc at

10mm

(C) and 5mm

(B)

could

not be displayed

it

should

be

noted as

reflector

within

the

region would

not be detected

dead

zone).

2.2

Shear

Wave

(Angle)Probe.

2.2.1, Place

he probe on

Position

D or

E. The signal

from

the

side drilled hole shouldbe distinguishablydisplayed'

2.2.2 Near surface

resolution

can be

determined

by

using

block

with

side

drilled

holesnear

to the surface.

3.0

TOLERANCE

The signal

amplitude of

subsequent

signals

should

be

clearly

separated

s ndicated

on the sketch

below.

Full Resolution

Partial

resolution

4.0

FREQUENCYOF

CHECKING_

The

resolution check

of probe

-

unit

combined

shall

be

carned

out

for

new probe,

when beam

ndex/angle

or

at

leastonce

a

month.

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Edit ion

1.0

APPENDIX

VI

SWEEP

RANGE CALIBRATION

GENERAL

Sweep range calibration shall

be conducted

using

IIW V1'/V2

calibrationblock

for

a suitable

ange

or

the

thickness

of material

being

tested. Table 2 may be use

for the selection

of sweep

range calibration

for difference in material thickness.

LONGITUDINAL

WAVES

IIW

-

V1 and

V2 blocks

calibration.

other suitable

blocks

can

be used

for

SHEAR

WAVES

(ANGLE)

PROBE

Either VL or

V2 blocks can be used

or calibration.

3.1 Use

IWVl

Block

Place angle probe on

the block

directing

at

L00mm

quadrant.

Set

up multiple signals

at

100mm

intervals

be

reflections

between

the quadrant

and

the notches

of the

face

of the

block.

Maximized

the chosensignal.

Then,

adjust

he time-base

ontrol

so that

the first of

the multiple

signals

(not

the

initial

pulse)

coincides

with the zero

gratrcule

mark,

and a subsequent

signal

coincides

with an appropriate

graticule

mark at the

right

hand

end

of

the

screen,

example

if the signal

at

L0mm,

20mm,

300mm,etc, he first signalwould be setat zeromark or third to

the

"'J.0"

mark if calibration

is required over

a

total

range

of

200mm.

When the correct

spacing

of

signals

has

been

established,

adjust the

delay only

so

that the

first

of

multiple

signals

are placed

at the graticule

mark

which

is to correspond

to

its true range.

2.0

3.0

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Edit ion

4.0

3.2 Use

IW V2

Block

Use

IIW

V2

Block

-

Placeangle probe on the

block directing

at

25mm

or 50mm quadrant. Set up

repeated

signals

at

25mm,

100mm, 175mm,

etc,

when probe is directed on

the

25mm

quadrant and 50mm, 125mm, 200mm, etc.,

when probe

is

directed

on

the

50mm

quadrant. Maximized the signals

from

the 25mm quadrant or from the 50mm quadrant.

Adjust

the

time-base ontrol so that:

(i) 25mm quadrant

-

the signal coincides

with the

25mm

graticule mark and the second

signal

100mm coincides

with 100mmgraticulemark.

(ii) 50mm quadrant

-

the 50mm signal

coincides

with the

50mm graticule

mark and the second signal

125mm

coincides

with 125mmgraticule

mark

If a point

of a sweep

ange calibration

has moved on the

timeless

by

more

than

10%

of

its original time

base position,

the

calibration shall be corrected

with a note of

the correction

being

made

on the

report. If any signals

have been

recorded,

all

recorded indications shall be

re'examined

with the corrected

calibration and their valuescorrected

accordingly on

the

report.

3.3

TOLERANCE

Accurate calibration of the sweep

range to

maximum range displayed

s required.

FREQUENCYOF CALIBRATION

This calibration shall be

verified

when:-

i) at the start of seriesof testing

-2%

or

better of

the

5.0

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Edition

ii) with any substitution

of probe

/

cable

iii) with any substitution of

power source

it) at leastevery

4 hours during

testing

v) at the

finish of testing

vi) at any time, when the opinion of the UT Operator, there is doubt

as o the

validity of the

calibration.

TABLE

2

Selection

of Sweep

RangeCalibration

for Difference

n Material

Thickness

SweepRange

Calibration

(mm)

Material

Thickness

mm)

0o Probe

45o

Probe

60'Probe

70'Probe

100

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Edit ion

APPENDIX

VII

DAC CURVE

AND SENSITIVITY

CALIBRATION

L.0 SensitivityCalibration

Standard sensitivity

for examination

of

Production

weld

using

amplitude technique shall

be: basic

sensitivity

+

distance

amplitude

correction

+

transfer

correction.

2.0

Basic

Sensitivity

Reference

evel

screen

height

obtained

using

maximum

reflection

from

the 1.5mm diameter

hole in the

IIW block

(or other

block

which

result

in the

same

basiccalibration

sensitivity).

3.0

Distance

Amplitude Correction

The sensitivity

level shall

be adjusted

to provide

for attenuation

oss

throughout

the

range

of

sound

path to be

used by

DAC curve.

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Edit ion

APPENDIX VIII

TRANSFER

CORRECTION

There

s a difference n instrument

sensitivity

between the reference

block

and test component

due to test surface

oughness, ontactarea,component

temperature and

acoustical attenuation characteristic.

A correction

in

instrument

sensitivity s required

to

compensateor thesedifferences

and

is

describedbelow:

RECEIVER

(TRANSMITTER) (position

)

Fixed

Screen

isplay

7 5%

s0%

2s%

2 SKIP

Use two

angle beam

probes of the same

type. One acting

transmitter and

the other

as receiver.

Place he probes in-tandem on the

referenceblock

at

one

skip

distance

and

maximize

the signal o70o/o.

ote down the gain

(dB).

Mark

on the screenor on

a graphicalpaper

the peak of the

maximized

signal.

Reposition the probes to achieve

peak signal

at two skip

distance

repeatstep

(3+)

and

join

the two points

to obtain

ine R.

1.0

2.0

3.0

4.0

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Edit ion

5.0

On

the

surface

of test component, carry-out

step

(2) and at

the same

dB

gain.

Increase o decrease he signal

where the peak

is

on

line

R and

note down the

gain

(dB) difference.

The difference

in dB gain of the

instrument

in

step

(2) and

(5) is

the

transfer correction

and has to be

added or subtracted

during sizing

of"

defects.

The first

skip

distancehas to be greater

han

four inches

or otherwise

the successivekip distances hould be employed.

6.0

7.0

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Edit ion

GLOBAL NSPECTIONERVICES

DN

BHD

(465777-A)

Seromban . 70, Jln PS 212,Tmn PinggiranSenawang,

71450,

Sbn,

N.S fel : 06

6775267 Fax : 06 6797900

6775354

Ultrasonic

TestingReport

Clint

Proj6ct

ProcedureNo

Report No.

Date

Probe

0 Deg

45 Deg

60

Deg

70 Deg

Frequency Size

Ref

Levsl

Tr Loss

Scanning

dB

Renge

m 2nd BWE to

m

Mhz m

FSH dB

dB

dB

M

m m

m m

M h z m d B d B d B m

M h z m d B d B d B m

Sensitivity:

Angle

probe,

set DAC at 80% FSH

from

3.2mm O

of 25mm hickness.Normal Prob

sst 2nd BWE to

1000/6 SH

CLIENT:

SIGNATURE

DATE:

Q C

O E P T :

SIGNATURE:

DATE:

INSPECTED

B Y :

SIGNATURE

DATE:

Global


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Edit ion

GLOBAL INSPECTION ERVICESSDN

BHD

(6s777-^l

Seremban :70 ,J lnPS2/2 ,TmnPingg i ranSsnawang,71450,Sbn,N.S

e l :066775267Fax:066797900/6775354

CALIBRATION ERFORMANCEF ULTRASONIC

LAWDETECTOR

FLAW

DETECTORMAKER

MODEL

SERIAL

NUMBER

DATE ;

PROJECT:

TFST

TOTERANCE

RESUL

PASS FAIL

TIMEBASELINEARITY

+l-

2o/o

ECHO mm)

ls l

oh

rd

rd

4th

oh

5th

oh

AfiENUATOR

ACCURACY

(Ret

at 800/6 SH)

+

2dB

Not Less Than 950/6

0 E0%

dB 350/6o

45%

-18

dB Sohlo12oh

-24

dB Visible bovsbase

in 6

FSll tN

100oi6

%

800/6

oh

400h

oa

100h

oa

be visibl6 %

A M H L I F I E K

LINEARITY

DIFFERENCE ETWEENSMALLER IGNAL

AND

LARGERSIGNAL

HEIGHTTO BE

BETTER THAN 50/6 SH

,r.lvl

lll

*w

sMAt;r-,

$1,0{AU

'100%

oh

,A

oh

Yo

4004

oh

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I

RESOLUTION

ALL

(3)

ECHOES

O

BE CLEARLY

RESOLVED

PROB Si USED

t s E N E I K A I I U N

STRENGTH

MINIMUMOF

THREEBACK-WAILECHOES

RqNGE

mm}

Global


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Edition

AVVS t.t/Dt.tM9006

sEcnoN

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NSPECnON

Table6.3

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Page33

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AWS-UT-o1

ULTRASONIC

TESTING

PROCEDURE

ISSUED 30 January

008

REVISION:0

AWS

Dl.l :2006

Edition

sEcToN . NsPEcTlor{

AWS

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Bhd

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AWS-UT-OI

ULTRASONIC

TESTING

PROCEDURE

ISSUED 30

January

008

REVISION:0

AWSDl.l

:2006

Edition

GECTON O,

NIiPECTION

rws Dr.t/Dt.lM200t

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Page

5

of40

8/11/2019 AWS-UT-2006 Rev 0

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AWS-UT-OI

ULTRASOMC TESTING

PROCEDTJRE

ISSUED 30 January

008

REVISION:0

AWSDl.l :2006

Edition

tyvs

Dr.r/Dt.1M:@6

SECTION6,

INSPECTION

Table 6.7

(Condnued)

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Global


Bhd

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AWS-UT-OI

ULTRASONIC

TESTING

PROCEDURE

ISSUED

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January

008

REVISION:0

AWS

Dl.1 :2006

Edition

sEcfloN

6. NsPEcTloN

AlrltS

l.1/Dl.lM20O6

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ULTRASONIC

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Alrvg l.t/D .1M2000

sEcTroNG.

MIPECnON

qt

WEIDTHICKNESS.

mm

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AWS-UT-2006 Rev 0

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