1. WELDING REPRESENTATION
CHAPTER 25
WELDING REPRESENTATION

3. 25.1IMPORTANCE OF THE DRAWING
Welding is used very extensively and for large variety of purposes. It is essential to show accurate method of welding on working drawing.
To provide complete weld information on the drawing, a system of welding symbols was developed by ANSI.

4. 25.2 WELDING PROCESSES Three welding processes
Gas welding (Oxyacetylene welding)
Electric arc welding (Arc welding)
Electric resistance welding (Resistance welding)

6. 25.3 TYPS OF WELD JOINTS There are five basic types of weld joints.
But joint
Corner joint
T joint
Over lap joint
Edge joint

7. 25.4 TYPES OF WEELD Four basic types of arc and Gas weld.
Back or backing
Fillet
Plug or spot
Groove

9. 25.5 WELDING SYMBOLS

10. Note that for all fillet or groove symbols, the vertical side of the symbol is always drawn on the left.

11. A COMPLETE WELD SYMBOL

12. WELD PROCESS
If no reference is indicated in the symbol, the tail is omitted.

13. Welds extending completely around a joint are indicated by an open circle around the elbow of the arrow.

14. FIELD WELD

15. Spot, seam, flash, or upset symbols usually do not have arrow side or other side significance and are simply centered on the reference line of the arrow.

16. BEVEL OR J-GROOVE WELD

17. FILLET WELD

19. C=chipping, G=grinding, M=machining, R=rolling H=hammering For only letter, no finishing For finishing, show finish symbol as well.

20. 25. 7 GROOVE WELD The depth of the V, J or U weld is the size
25.7 GROOVE WELD The depth of the V, J or U weld is the size. A general note may also be used as “ALL V-GROOVE WELDS TO HAVE 600ANGLE UNLESS OTHERWISE SHOWN” Root penetration and angle shown vertically.

21. When groove welds are to be approximately flush without finishing, the flush contour symbol is added.

22. If the welds are to be machined, the flush contour symbol and standard finish symbol are shown.

23. 25.8 BACK OR BACKING WELD

24. 25.9 SURFACE WELD Show the deposit of the weld at left side of the symbol. Since used for build up the surfaces not for joint, no arrow or other side, symbol always below.

25. 25.10 PLUG OR SLOT WELD A hole or slot is made in one member to receive the weld. Size is the smallest diameter of the plug hole. Dimension for the slot weld on drawing as in (f).

26. Plug weld is to filled the full depth
Plug weld is to filled the full depth. If no then depth is indicated inside symbol.

27. 25. 11 SPOT WELD The size of the spot weld is its diameter
25.11 SPOT WELD The size of the spot weld is its diameter. May have or may not have arrow side or other side significance.

28. 25.12 SEAM WELDING May have or may not have arrow side or other side significance. The size of the seam weld is width.