Lincoln Electric MAGNUM 350 User Manual page 25

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PROBLEMS
(SYMPTOMS)
Frequent occurrence of contact tip
burnback.
Poor weld bead appearance (porosi-
ty or dull gray oxidized surface).
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 througout this manual
POSSIBLE AREAS OF
MISADJUSTMENTS
PROBLEMS
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
MAGNUM™ PRO 350 and 550 FUME GUNS
1. See welding wire literature for
2. See symptoms on intermittent or
1. See symptom "Low or no gas
2. See symptom "Low or no gas
3. Check that the gas supplyʼs label-
4. Erect a wind shield or move to a
5. Reconnect machineʼs welding
6. See welding wire literature for
CAUTION
RECOMMENDED
COURSE OF ACTION
proper settings
sluggish wire feed
flow".
flow".
ing reads 100% argon.
Temporarily use alternate, known
gas supply and check for appear-
ance improvement.
non-windy location before welding
output to proper electrode polarity
proper settings
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