Firepower MST 220i, Руководство по эксплуатации

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FIREPOWER MST 220i
Manual 0-5343 4-13 BASIC WELDING
Art # A-07701
Figure 4-25: Single Run Vertical Fillet Weld
Art # A-07702
Figure 4-26: Multi Run Vertical Fillet Weld
Art # A-07703
Figure 4-27: Examples of Vertical Fillet Welds
2. Vertical Down
The E7014 electrode makes welding in this
position particularly easy. Use a 1/8" (3.2 mm)
electrode at 100 amps. The tip of the electrode
is held in light contact with the work and the
speed of downward travel is regulated so that
the tip of the electrode just keeps ahead of the
slag. The electrode should point upwards at an
angle of about 45º.
3. Overhead Welds
Apart from the rather awkward position neces-
sary, overhead welding is not much more dif-
ficult 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 posi-
tion 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 1/8" (3.2 mm) E6013 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
Distortion
Distortion in some degree is present in all forms of
welding. In many cases it is so small that it is barely
perceptible, but in other cases allowance has to be
made before welding commences for the distortion that
will subsequently occur. The study of distortion is so
complex that only a brief outline can be attempted hear.