Filter
Top Products
OUTPUT PROBLEMS
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
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.
CAUTION
The arc "flutters" when TIG weld-
ing.
1. The tungsten electrode may be
too large in diameter for the cur-
rent setting.
2. The tungsten tip may not be
"sharp" enough.
3. The gas shielding may be insuf-
ficient. Increase the gas flow
and or reduce the tungsten
stickout beyond the gas cup.
4. Check for contaminated gas or
leaks in the gas line, torch, or
connections.
5. If a helium blend is used as a
shielding gas then reduce the
percentage of helium.
1. Check the polarity switch for
proper operation and loose or
faulty lead connections. See
wiring diagram.
2. Perform the SCR Bridge Test.
3. Check for loose or faulty con-
nections at the shunt. ( leads
#221 and #222 ).
4. Check components R3 and C4
in the high voltage transformer
primary circuit. Replace if nec-
essary. See wiring diagram.
5. The control board may be
faulty. Replace.
The arc "pulsates" when AC TIG
welding.
1. Make sure the gas and proce-
dure are correct for the process
being used.
1. Check the micro switch S2A on
the polarity switch. It may be
stuck closed. See wiring dia-
gram.
TROUBLESHOOTING AND REPAIR
F-9 F-9
PRECISION TIG® 225
Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC