Welding Symbol

Components of a symbol including Reference, Line, Arrow, Weld Symbols, Dimension & Other Data, Supplementary Symbols, Finish Symbols, Tail and Other Specifications

Reference Line and Arrow

The reference line includes an arrow pointing to the joint that requires welding. If there are additional requirements, they will be written in the tail section of the welding symbol.

Example: Specify welding with GTAW or TIG.

Weld symbol above or below the reference line

1. Square Groove
2. Scarf Groove
3. V Groove
4. Bevel Groove
5. U Groove
6. J Groove
7. Flare V Groove
8. Flare Bevel Groove
9. Fillet Weld
10. Plug / Slot
11. Spot or Projection
12. Seam
13. Backing
14. Surfacing
15. Stud
16. Edge

Supplementary symbol

1. Weld all around
2. Weld during installation or Field weld
3. Melt-Through
4. Insert
5. Backing material is used
6. Filler material is used in the joint gap
7. Flat
8. Convex
9. Concave

On behalf of Worachart Group, we would like to express our sincere gratitude to Teacher Thares Taping for generously sharing valuable knowledge, which will be beneficial to those who wish to continue their studies in the future.