This document provides definitions and examples of welding symbols used in technical drawings. It explains the basic components of a welding symbol including the required reference line and arrow. The tail of the symbol indicates the welding process and specifications. Examples are given for different types of welds like fillet welds, groove welds, and intermittent welds. Key elements like weld size, preparation details, and additional information are described. The document aims to define common welding symbols and their components for technical drawings.

1. Welding Symbols
Understanding Welding Symbols
Terms and Definitions
WELDING SECTION DMBA

2. CREATED BY WELDING
SECTION (DMBA)
WELDING SECTION DMBA

3. Reference Line (Required element)
•Reference Line
Always Horizontal
WELDING SECTION DMBA

4. Reference Line (Required element)
Arrow
Arrow Line
WELDING SECTION DMBA

5. Reference Line (Required element)
Arrow
Tail
Tail
WELDING SECTION DMBA

6. Reference Line (Required element)
Arrow
Tail
Reference Line must always be horizontal,
Arrow points to the line or lines on drawing which clearly identify the proposed joint or
weld area.
The tail of the welding symbol is used to indicate the welding or cutting processes,
as well as the welding specification, procedures, or the supplementary information
to be used in making the weld.
WELDING SECTION DMBA

7. Reference Line (Required element)
Arrow
Tail
Reference Line must always be horizontal,
Arrow points to the line or lines on drawing which clearly identify the proposed joint or
weld area.
The tail of the welding symbol is used to indicate the welding or cutting processes,
as well as the welding specification, procedures, or the supplementary information
to be used in making the weld.
Basic components of a WELDING SYMBOL
Tail omitted when reference not used
Arrow connects reference line to arrow side
member of joint or arrow side of joint
WELDING SECTION DMBA

8. A circle at the tangent of the arrow and the reference line
means welding to be all around.
All the way Around
WELDING SECTION DMBA

9. A flag at the tangent of the reference line and arrow
means Field Weld.
Field Weld Symbol
WELDING SECTION DMBA

10. ARROW SIDE
OTHER SIDE
Weld Symbol Terminology
WELDING SECTION DMBA

11. Break in arrow means arrow side
must be side that beveling or
other preparation required.
WELDING SECTION DMBA

12. Fillet Weld (Arrow Side Only)
WELDING SECTION DMBA

13. Fillet Weld (Other Side)
WELDING SECTION DMBA

14. 1/4
1/4
Size of Fillet Weld Noted
WELDING SECTION DMBA

15. 1/4
1/4
(5/16)
(5/16)
Depth of
preparation or
groove
Depth of penetration
Example of Double Bevel
Groove weld
WELDING SECTION DMBA

16. Plug or Slot Weld Symbol
Arrow Side
WELDING SECTION DMBA

17. 5/16
5/16
What does this symbol
Represent?
WELDING SECTION DMBA

18. 5/16
5/16
Single-Bevel-Groove and Double
Fillet Weld Symbol
WELDING SECTION DMBA

19. Single-Bevel-Groove and Double
Fillet weld Symbols
WELDING SECTION DMBA

20. Chain Intermittent Fillet Weld
Weld both sides each end and 10
inches center to center in between
1/4
1/4
2-10
2-10
10 in
WELDING SECTION DMBA

21. Staggered Intermittent Fillet
Weld
Weld ends than 10 inch centers
staggered each side
10 in
10 in
2-10
2-10
1/4
1/4
WELDING SECTION DMBA

22. S(E) L-P
F
A
R
(N)
Depth of bevel
Groove weld size
Finish Symbol
Groove Angle included angle of
countersink for plug welds
Root opening; Depth of filling for
plug and slot welds.
Pitch(Center-to-
center spacing) of
welds
Number of spot, seam, stud, plug,
slot, or projection welds
ARROW SIDE
OTHER SIDE
FIELD
WELD
Length of weld
WELDING SECTION DMBA

23. The End