Entry Task: Watch weekly video on district youtube channel.

Entry Task: Watch weekly video on district youtube channel.

Agenda: Review Chapter 45 Presentation Material. Read Chapter 45 – Welding Symbols, pgs 675 – 689.Complete Ch 45 Workbook, pgs 167 – 168. Answer all Questions.Complete Chapter 45 Assessment. Due by 6/5.

Turn in assessment via screenshot attachment or google form to: [email protected]

Student Target: I will learn about Welding Symbols with 80% accuracy.

Expected Discourse Level for this Lesson: N/A.

Exit Task: Turn in assessment by due date listed above.

For the week of: 6/1/20 – 6/5/20

Welding 4th Period

mailto:[email protected]

Premium PowerPoint® Presentation

Chapter 45

Welding Symbols • Combining Weld Symbols •

Nondestructive Examination Symbols

Welding Symbols

Chapter 45 — Welding Symbols

© 2015 by American Technical PublishersAll rights reserved

Objectives

• Explain the general features of a welding symbol.

• Explain weld symbol combinations for the different

types of welds.

• Describe the use of nondestructive examination

symbols.



A welding symbol is a graphical representation of the

specifications for producing a welded joint.



A weld symbol is a graphic symbol connected to the

reference line of a welding symbol specifying the weld type.



The location of the weld

symbol determines where

the weld is made.



With spot or seam welds, the arrow points to the centerline

of the weld seam and the appropriate weld symbol is

centered above or below the reference line.



In symbols showing

beveled joints, the arrow

points with a definite break

toward the part to be

beveled.



Fillet, single-bevel-groove,

J-groove, and flare-bevel-

groove weld symbols

appear with the

perpendicular leg to the left

of the weld symbol.



During fabrication of a

product, it may be

necessary to perform more

than one operation on a

joint. In such cases, both

the type of joint preparation

and the type of weld can

be combined in the weld

symbol.



A fillet weld is represented

by a right-angle triangle.

The weld toe is formed by

the junction between the

surface of the weld and the

base metal.



The length and pitch of

intermittent fillet weld

segments are shown to the

right of the weld symbol

separated by a dash. The

first number indicates the

length of each weld

segment and the second

number represents the

pitch (center-to-center

spacing) of adjacent weld

segments on one side of

the joint.



Common types of groove welds are single-square-groove

welds, double-square-groove welds, single-V-groove welds,

double-V-groove welds, single-bevel-groove welds, and

double-bevel-groove welds.



In groove welds, the height of the weld above the base

metal is called the face reinforcement.



A dimension in

parentheses to the left of a

groove weld symbol

indicates weld size. A

dimension to the left of a

weld symbol that is not in

parentheses indicates the

depth of groove.



The size of the root opening is located inside the weld

symbol. The groove angle is located above or below the

root opening size as appropriate.



The sizes of flare-V-groove and flare-bevel-groove welds

are indicated by dimensional lines.



The size of a plug weld is shown to the left of the plug weld

symbol and is preceded by the diameter symbol, Ø. The

depth of filling, when less than complete, is shown inside

the weld symbol. The center-to-center distance (pitch) is

shown to the right of the weld symbol.



The slot weld symbol is

similar to the plug weld

symbol except that it does

not include a diameter

symbol.



Spot welds are

dimensioned by either size

or strength.



Seam welds are

dimensioned by either size

or strength.



A small circle appears

where the arrow connects

the reference line to denote

“weld-all-around.”



Field welding symbols are

shown by a darkened

triangular flag at the

juncture of the reference

line and arrow.



The welding symbol tail

contains additional

information about a weld

that does not belong on the

reference line.



When bead contour is important, a special flat, concave, or

convex contour symbol is added to the welding symbol.



The back or backing weld

symbol is included opposite

the weld symbol with a

note included in the tail.

When multiple reference

lines are used, back and

backing welds are shown in

the appropriate sequence.



A solid semicircle on the reference line opposite the weld

symbol indicates complete penetration or melt-through.



Welds whose surfaces must be built up by single- or

multiple-pass welding are denoted by a surfacing weld

symbol.



Points to Remember

• A welding symbol is a graphical representation of the

specifications for producing a welded joint.

• Instructions regarding the type of weld are indicated

either above or below the reference line.

• The arrow side of the joint is the side of the joint to

which the arrow points. The other side is the side of

the joint opposite the arrow side.…Continued on next slide



Points to Remember (continued)

• When more than one operation is required on a joint,

a symbol is shown for each operation.

• Welds to be made in the field are shown by a

darkened triangular flag at the juncture of the

reference line and arrow.

• Nondestructive examination (NDE) symbols are

symbols that specify examination methods and

requirements to verify weld quality.



Questions for Study and Discussion

1. What is the arrow side of the welding symbol?

2. What is the other side of the welding symbol?

3. Indicate the meaning of the following welding

symbols.

…Continued on next slide



Questions for Study

and Discussion (continued)

4. What type of weld do these symbols indicate?

5. These symbols represent which weld

specifications?




Questions for Study


6. These symbols represent which weld specifications?

7. Draw completed welding symbols, including necessary information, to describe the following welds.




Questions for Study


8. What do these welding symbols mean?

9. What do these welding symbols represent?




Questions for Study


10. Using the appropriate table in the appendix, identify

the parts of the master welding symbol shown.

Entry Task: Watch weekly video on district youtube channel.

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