ESAB CIGWELD WeldSkill 205AC/DC Operating Manual page 55

Figure 6-14: Weld build up sequence
Heavy plate will require several runs to complete the
joint. After completing the first run, chip the slag out
and clean the weld with a wire brush. It is important
to do this to prevent slag being trapped by the second
run. Subsequent runs are then deposited using either
a weave technique or single beads laid down in the
sequence shown in Figure 6-14. The width of weave
should not be more than three times the core wire
diameter of the electrode. When the joint is completely
filled, the back is either machined, ground or gouged
out to remove slag which may be trapped in the root,
and to prepare a suitable joint for depositing the
backing run. If a backing bar is used, it is not usually
necessary to remove this, since it serves a similar
purpose to the backing run in securing proper fusion
at the root of the weld.
B. Fillet Welds
These are welds of approximately triangular cross-
section made by depositing metal in the corner of
two faces meeting at right angles. Refer to Figure 6-4.
A piece of angle iron is a suitable specimen with which
to begin, or two lengths of strip steel may be tacked
together at right angles. Using a 3.2mm Ferrocraft 21
electrode at 100 amps, position angle iron with one
leg horizontal and the other vertical. This is known
as a horizontal-vertical (HV) fillet. Strike the arc and
immediately bring the electrode to a position perpen-
dicular to the line of the fillet and about 45° from the
vertical. Some electrodes require to be sloped about
20° away from the perpendicular position to prevent
slag from running ahead of the weld. Refer to Figure
6-15. Do not attempt to build up much larger than
6.4mm width with a 3.2mm electrode, otherwise
the weld metal tends to sag towards the base, and
undercut forms on the vertical leg. Multi-runs can be
made as shown in Figure 6-16. Weaving in HV fillet
welds is undesirable.
0-5555
Art # A-07698
Figure 6-15: Electrode position for HV fillet weld
C. Vertical Welds
1. Vertical Up
6-9
45° from
vertical
60° - 70° from line
of weld
6
3
5
2 4
1
Figure 6-16: Multi-runs in HV fillet weld
Tack weld a three feet length of angle iron to
your work bench in an upright position. Use a
3.2mm Ferrocraft 21 electrode and set the cur-
rent at 100 amps. Make yourself comfortable
on a seat in front of the job and strike the arc
in the corner of the fillet. The electrode needs
to be about 10° from the horizontal to enable
a good bead to be deposited. Refer Figure
6-17. Use a short arc, and do not attempt to
weave on the first run. When the first run has
been completed de-slag the weld deposit and
begin the second run at the bottom. This time
a slight weaving motion is necessary to cover
the first run and obtain good fusion at the
edges. At the completion of each side motion,
pause for a moment to allow weld metal to
build up at the edges, otherwise undercut will
form and too much metal will accumulate in
the centre of the weld. Figure 6-18 illustrates
multi-run technique and Figure 6-19 shows
the effects of pausing at the edge of weave
and of weaving too rapidly.
Art # A-07699_AB
Art # A-07700_AB
STICK (MMAW) Welding