1. Welding Symbols
Developed by the American Welding Society in the 1930’s.
Welding symbol refers to the total symbol including all information added to specify the weld(s) required.
Weld symbol refers to the symbol for a specific type of weld.

2. used to apply weld symbol and other data. an arrow
A standard welding symbol consists of:
a reference line
used to apply weld symbol and other data.
an arrow
connects the reference line to the joint or area to be welded.
a tail
added only when needed for giving a specific process or other reference.

3. A welding symbol may or may not use:
Basic weld symbol
describes the weld accurately and completely
Dimensions and other data
gives the size/placement of weld
Finish symbol
method of finish
Supplementary symbol
weld all around, field weld, contour of finish weld

4. The arrow is always drawn at an angle to the reference line.
The reference line is always drawn horizontal to the bottom of the print.
It is never drawn parallel or in the same plane as the reference line.

5. Standard Welding Symbol

6. Location of Dimensions

7. Weld Symbols When the weld symbol appears on the top,
the weld is placed on the other side

8. When the weld symbol appears on the bottom,
the weld is placed on the arrow side

9. Basic Weld Symbols
Fillet weld
Plug or Slot
V-groove
Bevel

10. Spot or Projection
Seam
Back or Backing
Surfacing

11. U-groove
J-groove
Square
Scarf for braze joint

12. Edge
Stud
Flare-V
Flare-bevel

13. Supplementary Symbols
Field Weld
Weld-all around
Melt-thru
Consumable Insert

14. Backing Spacer
Flush contour
Convex contour
Concave contour

15. Typical Weld Symbols
Multiple reference lines

16. Double fillet symbol

17. Intermittent fillet symbol

18. Root opening symbol

19. Convex contour symbol

20. Melt-thru symbol

21. Square v-groove weld symbol

22. Finishing C
chipping G
grinding H
hammering M
machining R
rolling

23. Welding Symbol Examples
Fillet weld arrow side

24. Fillet weld other side

25. Fillet weld-all around

26. Length and pitch of weld
1-3 1” 3”

27. Size of weld
3/8”
3/8”

28. Weld Positions 1
flat 2
horizontal 3
vertical 4
overhead 5
pipe weld

29. G
groove weld F
fillet weld