Guide to Projection Weld Symbols
When using projection welding, the spot weld symbol must be used with the projection welding process reference in the tail of the welding symbol. The spot weld symbol must be centered on the reference line.
Embossments on the arrow side member of a joint for projection welding shall be indicated by placing the weld symbol on the side of the reference line toward the reader (fig. 3-72).
Projection Weld Symbols
Embossment on the other side member of a joint for projection welding shall be indicated by placing the weld symbol on the -side of the reference line away from the reader (fig. 3-73).
Other Side of Joint - Projection Weld Symbol
Proportions of projections must be shown by a detail or other suitable means.
Dimensions of projection welds must be shown on the same side of the reference line as the weld symbol.