Lincoln Electric SQUARE WAVE IM687 Operator's Manual page 24

E-6
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
No high frequency. Machine is in
the TIG Mode and has normal out-
put.
No gas flow when Amptrol is activat-
ed in the TIG Mode. Machine has
output - fan runs. A "Click" can be
heard indicating that the gas sole-
noid 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.
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
TIG WELDING PROBLEMS
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.
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.
CAUTION
SQUARE WAVE TIG 175 PRO
RECOMMENDED
COURSE OF ACTION
Contact your Local Lincoln Authorized
Field Service Facility for technical
troubleshooting assistance.
E-6