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E-3
PROBLEMS
(SYMPTOMS)
Poor arc striking with sticking or
"blast-offs", weld porosity, narrow
and ropy looking bead, or electrode
stubbing into plate while welding.
Tip seizes in diffuser.
MAGNUM® PRO 350, 450 AND 550 DUAL PROCEDURE & DUAL SCHEDULE
TROUBLESHOOTING
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE
PROBLEMS
1. Improper procedures or tech-
niques.
2. Improper gas shielding.
1. Tip overheating due to prolonged
or excessive high current and/or
duty cycle welding.
CAUSE
1. See "Gas Metal Arc Welding
2. Clean gas cone. Make certain
1. Do not exceed current and duty
RECOMMENDED
COURSE OF ACTION
Guide" (GS100).
that gas diffuser is not restricted.
Make certain that gas cylinder is
not empty or turned off. Make
certain gas solenoid valve is
operating and 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 brass connector is in
place and tightened against the
liner bushing.
cycle rating of gun.
A light application of high
temperature antiseize lubricant
(such as Lincoln E2067 Graphite
Grease) may be applied to tip
threads.
E-3
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