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PRECISION TIG 185
TROUBLESHOOTING & REPAIR
F-13 F-13
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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
1-888-935-3877.
TIG WELDING PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
When AC TIG welding, the arc is
erratic and there is a loss of "clean-
ing" of the work piece.
The end of the tungsten electrode
melts away.
1. The tungsten electrode may be
too small for the process. Use a
larger diameter tungsten or a
pure tungsten.
2. If a helium blend is used as a
shielding gas, then reduce the
percentage of helium.
1. The welding current is too high
for the electrode type and or
size. See Table B.1 in the
Operation Section.
1. Check components R3 and C4 in
the high voltage transformer pri-
mary circuit.
2. Perform the SCR Bridge Test.
1. This may be a welding procedure
problem.
Contact The Lincoln Electric Service
Department 1-888-935-3877.