Malfunction
Corrective Action
Possible Cause
Inadequate shield-
7.
Extremely black de-
Check to make sure gas is
ing gas coverage or
turned on, properly adjusted.
posits on weld and
lack of fusion to base
moisture in weld
Can be caused by moisture in
gas. Try another gas cylinder.
metal.
area or dirty
electrode wire.
Check hoses and welding gun
for moisture. Check electrode
wire for moisture and dirt.
1 Amp Fuse blows.
Check guide tube for burn-back.
8.
Burn-back at guide
Check above for cause of burn-
tube in gun or
back. Check for wire
electrode wire
obstructions.
obstruction.
With control monitor discon-
Rectifier 1REC or
9.
2 Amp Fuse blows as
nected from 115 volt supply,
capacitor 5CAP
soon as line switch
check rectifier and capacitor
is closed.
shorted.
for shorts.
10.
Adjust slides on 2RES toward
Resistor 2RES im-
Inching speed too
right end of resistor. Check
properly adjusted
slow.
for electrode wire obstructions.
or electrode wire
feed obstruction.
SAFETY PRECAUTIONS
Inert-gas metal-arc welding processes produce intense visible and ultra-
violet radiation and require certain precautions to protect the operator
from injury.
For eye protection, welding helmets should have a #10 or #12 shade welding
plate. In addition, the operator should wear #2 shade flash goggles with
wide side shields under the helmet.
The skin should be completely covered. Leather gloves are recommended for
hand protection. Heavy, dark-colored clothing should be worn to prevent
radiation from penetrating to the skin or from reflecting onto the neck
under the hood. Light weight leather protective clothing is also recommended
because of its durability and resistance to deterioration from the radiation.
It should be noted that cotton clothing is subject to rather rapid deteriora-
tion.
Adequate ventilation should be provided to remove fumes produced by the
process, as set forth in American Standard Z-49.1 on safety in welding.
