Maintenance, Drive rolls and guide tubes, Cable cleaning – Lincoln Electric WIRE-MATIC 255 SVM 119-A Manuel d'utilisation
Page 38: Gun tubes and nozzles, Contact tip and gas nozzle installation, Caution
D-3
MAINTENANCE
D-3
DRIVE ROLLS AND GUIDE TUBES
After every coil of wire, inspect the wire drive mecha-
nism. Clean it as necessary by blowing with low pres-
sure compressed air. Do not use solvents for cleaning
the idle roll because it may wash the lubricant out of
the bearing. All drive rolls are stamped with the wire
sizes they will feed. If a wire size other than that
stamped on the roll is used, the drive roll must be
changed.
CABLE CLEANING
Clean the cable liner after using approximately 300
pounds (136 kg) of electrode.
1.
Remove the cable from the wire feeder and lay it
out straight on the floor.
2.
Remove the contact tip from the gun.
3.
With an air hose at the gas diffuser end, use low
pressure to gently blow out the cable liner.
Excessive pressure at the start may cause the dirt
to form a plug.
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4.
Flex the cable over its entire length and again blow
out the cable.
5.
Repeat this procedure until no more dirt comes
out.
GUN TUBES AND NOZZLES
1.
Replace worn contact tips as required.
2.
Remove spatter from the inside of the gas nozzle
and tip every 10 minutes of arc time or as required.
CONTACT TIP AND GAS NOZZLE
INSTALLATION
1.
Choose the correct size contact tip for the elec-
trode being used (wire size is stenciled on the side
of the contact tip) and screw it snugly into the gas
diffuser.
a.
Be sure the nozzle insulator is fully screwed
onto the gun tube and does not block the gas
holes in the diffuser.
2.
Slip or screw the appropriate gas nozzle onto the
nozzle insulator.
Note: Either a standard .50" (12.7mm) or optional .62"
(15.9mm) I.D. slip-on gas nozzle may be used and
should be selected based on the welding application.
3.
Adjust the gas nozzle as appropriate for the
GMAW process to be used.
a.
Typically, the contact tip end should be flush to
extended .12" (3.2mm) for the short-circuiting
transfer process and recessed .12" (3.2mm)
for spray transfer.
WIRE-MATIC 255
CAUTION