Lincoln Electric SQUARE WAVE TIG 355 Service Manual page 68

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Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Black areas along weld bead.
Black areas along weld bead at or
near end of weld.
The machine has low output when
in TIG 4-Step mode.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
TIG MODE PROBLEMS
1. The tungsten electrode may be
contaminated.
sharpen.
2. Shielding gas flow may be insuf-
ficient.
3. Contaminated gas or faulty gas
line or torch.
1. Increase the gas post flow time.
1. The machine must be in Local
control mode when 4-Step is
used.
2. The machine output control may
be set incorrectly.
CAUTION
SQUARE WAVE TIG 355
RECOMMENDED
COURSE OF ACTION
1. This may be a welding proce-
Replace or dure problem.
Contact The Lincoln Electric
Service Department, 1-888-
935-3877.
1. This may be a welding proce-
dure problem.
Contact The Lincoln Electric
Service Department, 1-888-
935-3877.
1. Contact The Lincoln Electric
Service Department, 1-888-
935-3877.
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