Firepower MST 140i, Руководство по эксплуатации

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Firepower MST 140i
Manual 0-5338 4-19 BASIC WELDING GUIDE
FAULT CAUSE REMEDY
6 Gas pockets or
voids in weld
metal (porosity)
A High levels of sulfur in steel. A Use an electrode that is designed for high sulfur
steels.
B Electrodes are damp. B Dry electrodes before use.
C Welding current is too high. C Reduce welding current.
D Surface impurities such as
oil, grease, paint, etc.
D Clean joint before welding.
E Welding in a windy environ-
ment.
E Shield the weld area from the wind.
F Electrode damaged ie flux
coating incomplete.
F Discard damaged electrodes and only use elec-
trodes with a complete flux coating.
7 Crack occurring in
weld metal soon
after solidification
commences
A Rigidity of joint. A Redesign to relieve weld joint of severe stresses or
use crack resistance electrodes.
B Insufficient throat thickness. B Travel slightly slower to allow greater build up in
throat.
C Weld current is too high. C Decrease welding current.
Not cleaned,
or incorrect
electrode
Slag
trapped in
undercut
Slag trapped in root
Art # A-05868_AC
Figure 3: Example of Slag Inclusion
8 The Stick elec-
trode is difficult to
run with multiple
arc-outs when
welding
The Stick electrode being
used is not suitable for use
with this machine.
Use E6013 or E7018 Stick electrodes for steel or
300 series stainless steel Stick electrodes for 300
series stainless steel.
Table 4-5: Welding Problems - Stick (SMAW)