Tweco 175i Transtig - Manual (Page 55)

TRANSMIG 175i
Manual 0-5143 4-17 BASIC WELDING GUIDE
3. Overhead Welds
Apart from the rather awkward position necessary, overhead welding is not much more difficult that
downhand welding. Set up a specimen for overhead welding by first tacking a length of angle iron at
right angles to another piece of angle iron or a length of waste pipe. Then tack this to the work bench
or hold in a vice so that the specimen is positioned in the overhead position as shown in the sketch.
The electrode is held at 45º to the horizontal and tilted 10º in the line of travel (Figure 4-28). The tip of
the electrode may be touched lightly on the metal, which helps to give a steady run. A weave technique
is not advisable for overhead fillet welds. Use a 3.2mm Ferrocraft 12XP electrode at 100 amps, and
deposit the first run by simply drawing the electrode along at a steady rate. You will notice that the
weld deposit is rather convex, due to the effect of gravity before the metal freezes.
Art # A-07704
Figure 4-28: Overhead Fillet Weld