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SQUARE WAVE TIG 255
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F-11
TROUBLESHOOTING & REPAIR
TROUBLESHOOTING GUIDE
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Lack of penetration in AC TIG
welding.
Black areas along weld bead.
Black areas along weld bead at or
near end of weld.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
1. Manual balance control set
improperly - set to negative
10 (-10) for maximum
penetration.
1. 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. Increase post flow time.
RECOMMENDED
COURSE OF ACTION
1. SCR bridge may be faulty. See
Static and Active SCR Tests.
2. Protection/Snubber board may
be faulty. See Protection/
Snubber Board Continuity Test.
3. Control board may be faulty.-
Replace.
This may be a welding procedure
problem.
Contact The Lincoln Electric
Service Department (216) 383-
2531 or 1-800-833-9353 (WELD).
This may be a welding procedure
problem.
Contact The Lincoln Electric
Service Department (216) 383-
2531 or 1-800-833-9353 (WELD).
TIG MODE PROBLEMS
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 216-383-2531 or 1-800-833-9353.
CAUTION