Figure 7-27.Weave motion for multipass fillet weld.
Figure 7-28.Order of making string beads for a tee joint in
Figure 7-29.Intermittent fillet welds.
Chain-intermittent or staggered-intermittent fillet
welds, as shown in figure 7-29, are used on long tee
joints. Fillet welds of these types are for joints where
high weld strength is not required; however, the short
welds are arranged so the finished joint is equal in
Figure 7-30.Tack welding a lap joint.
Figure 7-31.Position of electrode on a lap joint.
strength to that of a joint that has a fillet weld along the
entire length of one side. Intermittent welds also have
the advantage of reduced warpage and distortion.
LAP JOINTS. When you make a lap joint, two
overlapping plates are tack-welded in place (fig. 7-30),
and a fillet weld is deposited along the joint.
The procedure for making this fillet weld is similar
to that used for making fillet welds in tee joints. You
should hold the electrode so it forms an angle of about
30 degrees from the vertical and is inclined 15 degrees
in the direction of welding. The position of the electrode
in relation to the plates is shown in figure 7-31. The
weaving motion is the same as that used for tee joints,
except that the pause at the edge of the top plate is long
enough to ensure good fusion without undercut. Lap
joints on 1/2-inch plate or heavier are made by deposit-
ing a sequence of stringer beads, as shown in figure
In making lap joints on plates of different thickness,
you should hold the electrode so that it forms an angle
of between 20 and 30 degrees from the vertical