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Trouble Shooting
Fault
Irregular wire feed
Brittle or porous welding seam
Constant gas flow
No wire feed
No welding current with normal
working wire feed
Arcing when gas shroud touches
workpiece
Torch becomes excessively hot
No function of machine
(water-cooled units)
Torch under current when machine
is switched OFF
Cause
Incorrect tension of tension roller
Wire guide of feed motor not aligned
Liner clogged or not of correct size
for wire
Wire spooled irregularly, rusty or of
inferior quality
Wire spool carrier brake to tight
Feed rollers dirty or worn, groove
not matching wire size
Gas line fittings not tight
Gas cylinder empty
Gas cylinder valve closed
Pressure regulator not working
Solenoid valve not working
Gas shroud or line in lead ass'y
clogged
Air draft at weld seam
Workpiece not clean
Wire of inferior quality or unsuitable
gas
Solenoid valve defective or dirty
Trigger switch or leads in lead ass'y
defective
PCB defective
Fine wire fuse on PCB defective
Step switch faulty
Earth cable not conducting
Short-circuit between contact tip
and gas shroud
Contact tip loose or too large for
wire diameter
Mains fuse/circuit breaker tripped
Power switch defective
Remedy
Adjust tension
Align
Check and/or change
Clean or change liner
Change spool
Loosen
Clean or replace
Check fittings
Replace cylinder
Open valve
Check
Check power at solenoid
Clean shroud and spray, blow out
gas line
Protect from draft or increase gas
flow
Remove rust, grease, paint
Change wire, use suitable gas
Check, clean or replace
Check, replace if necessary
Replace
Replace with 2 amp fine wire fuse
Replace
Correct
Clean shroud, treat with anti-
clogging spray or nozzle dip
Tighten tip, replace with correct size
tip
Reset or replace
Check and replace
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