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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
Black areas along weld bead.
1. Clean any oily or organic conta-
mination from the work piece.
2. Tungsten electrode may be con-
taminated. Replace or sharpen.
3. Check for contaminated gas or
leaks in the gas line, torch, or
associated connections.
4. The gas shielding may be insuf-
ficient. Increase gas flow:
reduce tungsten stickout beyond
the gas cup.
1. This may be a welding proce-
dure problem.
Contact The Lincoln Electric
Service Department, 1-888-935-
3877.
Weak high frequency - machine
has normal welding.
1. Check for loose or faulty con-
nections at the torch and/or
welding cables.
2. The gas shielding may be insuf-
ficient. Increase gas flow:
reduce tungsten stickout beyond
the gas cup.
3. Check spark gap operation and
setting. Normal is (0.015").
Refer to Maintenance section of
this manual.
4. The work and electrode cables
may be in poor condition allow-
ing the high frequency to "leak
off". Use good quality cables
with a high natural rubber con-
tent, such as Lincoln Stable Arc
Cable. Cables should be as
short as possible.
1. Make sure that 115VAC is
being applied to the primary of
the high voltage transformer
(T3). See wiring diagram.
2. Check for any open or arcing
high frequency component.
Replace as required.
(Examples: C3, R3, C4)
3. If spark is weak at the spark
gap, check or replace the high
frequency circuit.
(Examples: T3, L3, L4).
TROUBLESHOOTING AND REPAIR
F-10 F-10
PRECISION TIG® 225
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