Lincoln Electric IM990 MAGNUM PRO 350 and 550 FUME GUNS - Manual (Page 25)

E-4 TROUBLESHOOTING E-4
MAGNUM™ PRO 350 and 550 FUME GUNS
Observe all Safety Guidelines detailed througout 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
PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS
RECOMMENDED
COURSE OF ACTION
Frequent occurrence of contact tip
burnback.
Poor weld bead appearance (porosi-
ty or dull gray oxidized surface).
1. Improper welding parameters or
technique (example: ESO is too
short).
2. Wire may be feeding intermittent-
ly.
1. No gas flow.
2. Low gas flow.
3. Improper or contaminated shield-
ing gas.
4. Welding in a windy environment.
5. Improper electrode polarity.
6. Improper welding parameters or
technique
1. See welding wire literature for
proper settings
2. See symptoms on intermittent or
sluggish wire feed
1. See symptom “Low or no gas
flow”.
2. See symptom “Low or no gas
flow”.
3. Check that the gas supplyʼs label-
ing reads 100% argon.
Temporarily use alternate, known
gas supply and check for appear-
ance improvement.
4. Erect a wind shield or move to a
non-windy location before welding
5. Reconnect machineʼs welding
output to proper electrode polarity
6. See welding wire literature for
proper settings