Lincoln Electric IM613-B Operator's Manual page 37

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PROBLEMS
(SYMPTOMS)
2. Variable or "hunting arc.
3. Poor arc striking with sticking or
"blast-offs", weld porosity, narrow
and ropy looking bead, or electrode
stubbing into plate while welding.
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
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE CAUSE
a. Wrong size, worn and/or melted
contact tip. - Replace if neces-
sary.
b. Worn work cable or poor work
connection. - Replace if neces-
sary.
c. Loose electrode or work cable
connections.
d. Wrong polarity. - Make sure elec-
trode polarity is correct for
process being used.
e. Gas nozzle extended beyond gun
tip or wire stickout too long while
welding.
f. Poor gas shielding on processes
requiring gas. - Check gas flow
and mixture.
a. Improper procedures or tech-
niques. - See "Gas Metal Arc
Welding Guide" (GS-100).
b. Improper gas shielding - Clean
gas nozzle. Make certain that gas
diffuser is not empty or turned off.
Make certain gas flow rate is
proper.
Remove gun liner and check rub-
ber seal for any sign of deteriora-
tion or damage. Be sure set
screw in connector block is in
place and tightened against the
liner bushing.
POWER FEED 11
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Lincoln Authorized
Field Service Facility.
CAUTION
RECOMMENDED
COURSE OF ACTION
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