Weldclass WeldForce WF-255MST, Operating Instructions Manual

Page: 63 / 80

WF-255
MST
© Weldclass 2019 | E.&O.E. | Edition 2.2 63
12.8.4 Overhead Welds
Apart from the rather awkward position necessary, overhead welding is not much more difficult that
down hand welding. Set up a specimen for overhead welding by first tacking a length of angle iron
at right angles to another piece 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 61). 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 Weldclass 12V Stick 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.
Figure 61