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.
Size of Projection Welds
Projection welds must be dimensioned by strength. Circular projection welds may be dimensioned by size.
The size of circular projection welds shall be
designated as the diameter of the weld expressed in fractions or in
decimals in hundredths of an inch and shall be shown, with or without
inch marks, to the left of the weld symbol (fig. 3-74).
The strength of projection welds shall be designated as the minimum
acceptable shear strength in pounds per weld and shall be shown to the
left of the weld symbol (fig. 3-75).
Symbol for Strength of Projection Welds
Spacing of Projection Welds
The pitch of projection welds shall be shown to the right of the weld symbol (fig. 3-76).
Projection Weld Spacing Symbols
Number of Projection Welds
When a definite number of projection welds
is desired in a certain joint, the number shall be shown in parentheses
(F, fig. 3-77).
Projection Weld Number Symbols
Extent of Projection Welding
When the projection welding extends less
than the distance between abrupt changes in the direction of the welding
or less than the full length of the joint, the extent shall be
dimensioned (fig. 3-78).
Symbols for Extent of Projection Welds
Flush Resistance Seam Welded Joints. When the exposed surface of one
member of a resistance seam welded joint is to be flush, that surface
shall be indicated by adding the flush contour symbol (fig. 3-3) to the
weld symbol, observing the usual location significance (fig. 3-71).
Contour of Resistance Seam Welds Symbols
For Additional Reading
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Page Author: Jeff Grill