Tweco 186 DC Inverter - Manual (Page 60)

186 AC/DC INVERTER BASIC WELDING
BASIC WELDING GUIDE 4-6 Manual 0-5237
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
4-4.
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. 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 4-13. Do not attempt
to build up much larger than 1/4" (6.4mm) width
with a 1/8" (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 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. 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
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