WELDING THEORY - OD1650 - LESSON 1/TASK 1
(5) Flush Resistance Spot Welding Joints. When the exposed surface of one member of a
resistance spot welded joint is to be flush, that surface will be indicated by adding the flush
contour symbol (refer to figure 3, view C, on page 9) to the weld symbol, observing the usual
location significance (figure 15, view F, on the previous page).
(a) Embossments on the arrow side member of a joint for projection welding will be
indicated by placing the weld symbol on the side of the reference line toward the viewer (figure
16, view A, on the following page).
(b) Embossments on the other side member of a joint for projection welding will be
indicated by placing the weld symbol on the side of the reference line away from the viewer
(figure 16, view B).
(d) Dimensions of projection welds will be shown on the same side of the reference
line as the weld symbol.
(2) Size of Projection Welds.
(a) Projection welds will be dimensioned by strength. Circular projection welds may
be dimensioned by size.
(b) The size of circular projection welds will be designated as the diameter of the
weld, expressed in fractions or decimally in hundredths of an inch, and will be shown with or
without inch marks to the left of the weld symbol (figure 16, view C).
(c) The strength of projection welds will be designated as the minimum acceptable
shear strength in pounds per weld, and will be shown to the left of the weld symbol (figure 16,