1. Welding Symbols
Chapter 30

2. Objectives Know the name of the AWS standard for welding symbols
List the eight elements that may be found on a welding symbol
List the basic weld symbols
List the supplementary symbols
Name the five basic joints
Identify the applications of the different weld symbols

3. American Welding Society
Material in this chapter reprinted through courtesy of AWS
Symbols include latest revision
For more detailed reference
Booklet Standard Symbols for Welding, Brazing, and Nondestructive Examination (AWS A2.4-98)
Published by the AWS
Many companies develop own system of symbols, references with AWS as base

4. ANS Symbol System Joint
Basis of reference
Welded joint indicated by symbol will have arrow side and other side
Use tail of reference line for giving specifications for welding
Welding process; type and brand of filler metal; where or not peening, chipping or preheating required and other information

5. Welding Symbol Components
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6. Examples of Arrow Symbols
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7. AWS Standard Weld symbol Welding symbol
Graphic symbol that indicates weld required
Welding symbol
Following eight elements:
Reference line (required)
Arrow (required)
Basic weld symbols
Dimensions and other data
Supplementary symbols
Finish symbols
Tail
Other specifications
Standard welding symbols given in Table 30-1

8. Basic Weld Symbols
AWS
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9. Basic Weld Symbols
AWS
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10. Welding Symbols
AWS
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11. Filet Welds and Symbol
Fillet weld triangular-shaped weld placed on the joint
Fillet weld symbol triangular in shape
Vertical line of fillet weld symbol always drawn to left of symbol
Size always shown to left of symbol and length to right of symbol
No length given, then weld should run full length of joint

12. Examples: Fillet Welds on T-Joints
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13. Example: Fillet Weld Length and Pitch Indications
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14. Weld-All-Around Symbol
Used when weld is to extend all way around joint or series of connected joints
Symbol: circle viewable at junction of reference line and arrow
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15. Symbols take the shape of the groove the weld is to be placed in.
Groove Welds
Seven types of groove welds and symbols to represent them
Square V
Bevel U J
Flare-V
Flare-bevel
Symbols take the shape of the groove the weld is to be placed in.

16. Groove Welds Place in a joint
Used to make butt joints, but can be used to make other types of joints
Double bevel
One of joint members has bevel on both sides and joint is to be welded from both sides
V shape

17. V-groove Weld on Butt Joint
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18. Double V-groove Weld on Butt Joint
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19. Contour Symbol Desired shape of weld shown on welding symbol
Located above imaginary face of weld for groove weld symbols and above side of triangle that most closely represents face of weld
Flat: straight line
Concave and convex: takes on that shape

20. Contour Symbol and Letters Which Indicate Finishing Method
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