Figure 3-50.Dimensioning of welds.
Figure 3-51.Supplementary symbols.
Figure 3-50 shows the meaning of various welding
dimension symbols. Notice that the size of a weld is
shown on the left side of the weld symbol (fig. 3-50,
view A). The length and pitch of a fillet weld are
indicated on the right side of the weld symbol. View B
shows a tee joint with 2-inch intermittent fillet welds
that are 5 inches apart, on center. The size of a groove
weld is shown in view C. Both sides are 1/2 inch, but
note that the 60-degree groove is on the other side of the
joint and the 45-degree groove is on the arrow side.
In addition to basic weld symbols, a set of supple-
mentary symbols may be added to a welding symbol.
Some of the most common supplementary symbols are
shown in figure 3-51.
Contour symbols are used with weld symbols to
show how the face of the weld is to be formed. In
addition to contour symbols, finish symbols are used to
indicate the method to use for forming the contour of the
When a finish symbol is used, it shows the method
of finish, not the degree of finish; for example, a C is
used to indicate finish by chipping, an M means machin-
ing, and a G indicates grinding. Figure 3-52 shows how
contour and finish symbols are applied to a weldng
symbol. This figure shows that the weld is to be ground
flush. Also, notice that the symbols are placed on the
same side of the reference line as the weld symbol.