Tweco 550i Transmig - Manual (Page 59)

TRANSMIG 350i, 450i, 550i
Manual 0-5205 4-15 BASIC WELDING GUIDE
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 4-14.
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 4-23. 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 4-24. Weaving
in HV fillet welds is undesirable.
Art # A-07699_AB
45° from
vertical
60° - 70° from line
of weld
Figure 4-23: Electrode Position for HV Fillet Weld
Art # A-07700_AB
1 2
3
4
5
6
Figure 4-24: 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 3.2mm
Ferrocraft 21 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 4-25. 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 4-26 illustrates multi-run technique and Figure 4-27 shows the effects
of pausing at the edge of weave and of weaving too rapidly.