Lincoln Electric SQUARE WAVE TIG 175 PRO Operator's Manual page 23

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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
Black areas along weld bead.
Weak high frequency - machine has
normal welding output.
High frequency "spark" is present at
tungsten electrode, but operator is
unable to establish a welding arc.
Machine has normal open circuit
voltage (refer to Technical
Specifications in the Installation
Chapter).
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local
Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
TROUBLESHOOTING
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
TIG WELDING PROBLEMS
1. Clean any oily or organic conta-
mination from the work piece.
2. Tungsten electrode may be cont-
aminated. Replace or sharpen.
3. Check for contaminated gas or
leaks in the gas line, torch, or
connections
4. Gas shielding may be insuffi-
cient. Increase gas flow; reduce
tungsten stickout beyond gas
cup.
1. Check for poor connections in
the welding circuit.
2. Gas shielding may be insuffi-
cient. Increase gas flow; reduce
tungsten stickout beyond gas
cup.
3. Check for work and electrode
cables in poor condition allowing
high frequency to "Leak Off".
4. Keep cables as short as possible.
5. Check Spark Gap operation and
setting (0.015")
1. The tungsten electrode may be
contaminated. Replace or sharp-
en.
2. The current control may be set
too low.
3. The tungsten electrode may be
too large for the process.
4. If a helium blend is used as a
shielding gas, then reduce the
percentage of helium.
CAUTION
SQUARE WAVE TIG 175 PRO
RECOMMENDED
COURSE OF ACTION
Contact your Local Lincoln Authorized
Field Service Facility for technical
troubleshooting assistance.
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