Figure 7-39.Position of electrode and weave motion in the
Figure 7-40.Multipass butt joint in the overhead position.
cable over your knee. With experience, cable placement
will become second nature.
Because of the possibility of falling molten
metal, use a protective garment that has a tight
fitting collar that buttons or zips up to the neck.
Roll down your sleeves and wear a cap and
Type of Welds
Techniques used in making bead welds, butt joints,
and fillet welds in the overhead position are discussed
in the following paragraphs.
BEAD WELDS. For bead welds, the work angle
of the electrode is 90 degrees to the base metal (fig. 7-39,
view A). The travel angle should be 10 to 15 degrees in
the direction of welding (fig. 7-39, view B).
Weave beads can be made by using the motion
shown in figure 7-39, view C. A rather rapid motion is
necessary at the end of each semicircular weave to
control the molten metal deposit. Avoid excessive weav-
ing because this can cause overheating of the weld
deposit and the formation of a large, uncontrollable
BUTT JOINTS. Prepare the plates for overhead
butt welding in the same manner as required for the flat
position. The best results are obtained when backing
strips are used; however, you must remember that you
will not always be able to use a backing strip. When you
bevel the plates with a featheredge and do not use a
backing strip, the weld will repeatedly burn through
unless extreme care is taken by the operator.
For overhead butt welding, bead welds are preferred
over weave welds. Clean each bead and chip out the
rough areas before placing the next pass. The electrode
position and the order of deposition of the weld beads
when welding on 1/4- or 1/2-inch plate are shown in
figure 7-40, views B and C. Make the first pass with the
electrode held at 90 degrees to the plate, as shown in
figure 7-40, view A. When you use an electrode that is
too large, you can not hold a short arc in the root area.
This results in insufficient root penetration and inferior
FILLET WELDS. In making fillet welds in
either tee or lap joints in the overhead position, maintain
a short arc and refrain from weaving of the electrode.