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18
TROUBLESHOOTING
18
SQUARE WAVE TIG 175
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 Local
Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
TIG WELDING PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
No high frequency. Machine is in
either 2 or 4 Step TIG Mode and has
normal output. Fan is running and
power light is on.
No gas flow when Amptrol is activat-
ed in the 2/4 Step TIG Modes.
Machine has output - fan runs. A
“Click” can
be heard indicating that
the gas solenoid valve is operating.
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. If the machine location is in a
highly dirty environment with
conductive contaminants, check
and clean the spark gap with a
low pressure air stream per the
maintenance instructions.
1. Gas supply is empty or not
turned on.
2. Flow regulator may be set too
low.
3. Gas hose may be pinched.
4. Gas flow may be blocked with
dirt. Check filter screen inside
gas inlet fitting to solenoid valve.
Use filters to prevent reoccur-
rence.
5. Consult your local welder/gas
distributor.
1. Tungsten electrode may be too
small for 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.
3. Gas shielding may be insuffi-
cient. Increase gas flow; reduce
tungsten stickout beyond gas
cup. Minimize crossdrafts in
welding area.
1. The welding current is too high
for the electrode type and/or
size. See the Table B.1 in the
Operation Section of this manu-
al.
Contact your Local Lincoln Authorized
Field Service Facility for technical
troubleshooting assistance.