Lincoln Electric PRECISION TIG 185 - Manual (Page 28)

E-4 TROUBLESHOOTING E-4
PRECISION TIG 185
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Machine output is intermittently lost.
Gas flow and high frequency are
also interrupted.
Arc “Flutters” when TIG welding.
Arc “Pulsates” when AC TIG weld-
ing.
1. Problem may be caused by high
frequency interference. Make sure
that the machine is grounded
properly according to the installa-
tion instructions. If there are other
high frequency sources in the
area, make certain that they are
grounded properly.
2. Check Amptrol for proper opera-
tion and loose connections.
3. Check for proper input voltage
and proper voltage reconnection.
1. Tungsten electrode may be too
large in diameter for the current
setting.
2. Tungsten not “sharp” when weld-
ing in DC - mode.
3. Gas shielding may be insufficient.
Increase gas flow; reduce tung-
sten stickout beyond gas cup.
4. Check for contaminated gas or
leaks in the gas line, torch, or con-
nections.
5. If a helium blend is used as a
shielding gas, then reduce the
percentage of helium.
1. Micro Switch mounted on Polarity
Switch is not opening in “AC”
mode.
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Lincoln Authorized
Field Service Facility.
TIG MODE PROBLEMS