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TROUBLESHOOTING & REPAIR
F-14 F-14
SQUARE WAVE TIG 355
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
216-383-2531 or 1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
TIG MODE PROBLEMS
Black areas along weld bead. 1. The tungsten electrode may be
contaminated. Replace or
sharpen.
2. Shielding gas flow may be
insufficient.
3. Contaminated gas or faulty gas
line or torch.
1. This may be a welding proce-
dure problem.
Contact The Lincoln Electric
Service Department, (216) 383-
2531 or 1-800-833-9353 (WELD).
Black areas along weld bead at or
near end of weld.
1. Increase the gas post flow
time.
1. This may be a welding proce-
dure problem.
Contact The Lincoln Electric
Service Department, (216) 383-
2531 or 1-800-833-9353 (WELD).
The machine has low output when
in TIG 4-Step mode.
1. The machine must be in Local
control mode when 4-Step is
used.
2. The machine output control
may be set iincorrectly.
1. Contact The Lincoln Electric
Service Department, (216) 383-
2531 or 1-800-833-9353
(WELD).