Figure 7-5.--Plug and slot welds.
Figure 7-6.--Spot weld and seam welds.
More commonly, however, seam welds are made
overlap. The size and shape of the weld (often
with a wheel-type electrode.
called the nugget) are determined by the size and
shape of the electrode tips used in the welding
PARTS OF WELDS
machine. A seam weld is very much like a spot
weld and may, in fact, be made as a series of
You should be familiar with the terms used to
overlapping spot welds, as shown in figure 7-6.
describe the parts of welds. Figure 7-7 illustrates
the face and the toe on groove and fillet welds. The
FACE is the exposed surface, on the side from
which the weld was made, of a weld made by a gas
or arc welding process. The TOE is the junction
between the face of the weld and the base metal.
The ROOT of a weld includes the points at
which the bottom of the weld intersects the base
metal surfaces, as seen in cross section. Figure 7-8
illustrates weld roots.
Figure 7-7.--Face and toe of groove and fillet welds.
Figure 7-8.--Weld roots.
7-8
