ESAB CIGWELD 220i, Руководство по эксплуатации, Страница: 71 / 94

Manual 0-5439 7-7 MANUAL ARC (MMAW) WELDING
Transmig 220i
OPERATING MANUAL
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 7-13. 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 7-5.
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 perpendicular to the line of the fillet and about 45º
from the vertical. Some electrodes require to be sloped about 20º away from the perpendicular position
to prevent slag from running ahead of the weld. Refer to Figure 7-14. 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 7-15. Weaving in HV
fillet welds is undesirable.
Figure 7-14: Electrode Position for HV Fillet Weld
Figure 7-15: Multi-runs in HV Fillet Weld
45° from
vertical
60° - 70° from line
of weld
Art # A-07699_AB
Art # A-07700_AB
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