Tweco ArcMaster 401S - Manual (Page 44)

ARCMASTER 401S POWER SOURCE
from the perpendicular position to prevent slag
from running ahead of the weld. Refer to Figure
4-13. Do not attempt to build up much larger than
width with a 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 4-14. Weaving in HV fillet welds
is undesirable.
Art # A-07699_AB
45° from
vertical
60° - 70° from line
of weld
Figure 4-13: Electrode Position for HV Fillet Weld
Art # A-07700_AB
1 2
3
4
5
6
Figure 4-`14: Multi-runs in HV Fillet Weld
C. Vertical Welds
1. Vertical Up
Tack weld a three feet length of angle iron to
your work bench in an upright position. Use
a electrode and set the current 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 10º
from the horizontal to enable a good bead to be
deposited. Refer Figure 4-15. 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
BASIC WELDING GUIDE 4-6 Manual 0-5345
accumulate in the centre of the weld. Figure
4-16 illustrates multi-run technique and Figure
4-17 shows the effects of pausing at the edge
of weave and of weaving too rapidly.
Art # A-07701
Figure 4-15: Single Run Vertical Fillet Weld
Art # A-07702
Figure 4-16: Multi Run Vertical Fillet Weld
Art # A-07703
Figure 4-17: Examples of Vertical Fillet Welds