Lincoln Electric IM904 INVERTEC STT II - Manual (Page 29)

E-6 TROUBLESHOOTING E-6
INVERTEC STT II (CE)
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Porosity in the weld
Weld bead appears “ cold ” .
Molten weld puddle appears exces-
sively
“ violent ” .
POSSIBLE
CAUSE
1. Make sure proper gas type and
flow rate is correct for procedure
being used. Shield work from
excessive outside air currents.
2. Check gun and nozzle for leaks
or obstructions.
3. Make certain machine and wire
feed settings are correct for
process.
1. One or more of the machine set-
tings may be wrong. Check the
Background, Peak Current,
Tailout and wire speed controls
for proper settings. Adjust for
optimum welding performance.
2. Make sure the Wire Type, and
Wire Size switches are in the cor-
rect position for the electrode
wire being used.
1. The Wire Type switch may be in
the wrong position for the elec-
trode wire being used.
2. The Peak Current setting may be
too high. Adjust for optimum
welding performance.
RECOMMENDED
COURSE OF ACTION
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service
Facility.
OUTPUT PROBLEMS