Figure 7-38.Butt joint welding in the vertical position.
slightly at the surface of plate G. Try not to undercut
either of the plates or to allow the molten metal to
overlap at the edges of the weave.
Lap joints on heavier plate may require more than
one bead. If it does, clean the initial bead thoroughly and
place all subsequent beads as shown in figure 7-37, view
F. The precautions to ensure good fusion and uniform
weld deposits that was previously outlined for tee joints
also apply to lap joints.
BUTT JOINTS. Prepare the plates used in verti-
cal welding identically to those prepared for welding in
the flat position. To obtain good fusion and penetration
with no undercutting, you should hold a short arc and
the motion of the arc should be carefully controlled.
Butt joints on beveled plates 1/4 inch thick can be
welded in one pass by using a triangular weave motion,
as shown in figure 7-38, view A.
Welds made on 1/2-inch plate or heavier should be
done in several passes, as shown in figure 7-38, view B.
Deposit the last pass with a semicircular weaving mo-
tion with a slight whip-up and pause of the electrode
at the edge of the bead. This produces a good cover pass
with no undercutting. Welds made on plates with a
backup strip should be done in the same manner.
E-7018 Electrode Welding Technique
The previously described vertical welding tech-
niques generally cover all types of electrodes; however,
you should modify the procedure slightly when using
When vertical down welding, you should drag the
electrode lightly using a very short arc. Refrain from
using a long arc since the weld depends on the molten
slag for shielding. Small weaves and stringer beads are
preferred to wide weave passes. Use higher amperage
with ac than with dc. Point the electrode straight into the
joint and tip it forward only a few degrees in the direc-
tion of travel.
On vertical up welding, a triangular weave motion
produces the best results. Do not use a whipping motion
or remove the electrode from the molten puddle. Point
the electrode straight into the joint and slightly upward
in order to allow the arc force to help control the puddle.
Adjust the amperage in the lower level of the recom-
Overhead welding is the most difficult position in
welding. Not only do you have to contend with the force
of gravity but the majority of the time you also have to
assume an awkward stance. Nevertheless, with practice
it is possible to make welds equal to those made in the
Current Settings and Electrode Movement
To retain complete control of the molten puddle, use
a very short arc and reduce the amperage as recom-
mended. As in the vertical position of welding, gravity
causes the molten metal to drop or sag from the plate.
When too long an arc is held, the transfer of metal from
the electrode to the base metal becomes increasingly
difficult, and the chances of large globules of molten
metal dropping from the electrode increase. When you
routinely shorten and lengthen the arc, the dropping of
molten metal can be prevented; however, you will defeat
your purpose should you carry too large a pool of molten
metal in the weld.
One of the problems encountered in overhead weld-
ing is the weight of the cable. To reduce arm and wrist
fatigue, drape the cable over your shoulder when weld-
ing in the standing position. When sitting, place the