Snap-on Tools Corporation Kenosha, WI 53141-1410
13
OPERATING HINTS
BURN BACK
In the event the welding wire
burns back into the contact tip:
1. Remove the nozzle from the
torch.
2. Unscrew the contact tip from the
gas diffuser using a pair of
pliers as the tip will be very
hot.
3. Free the wire from the contact
tip and clean the end of the tip
so the new wire will slide
smoothly through the hole. DO
NOT use a drill or reamer to
clean the hole as they will
enlarge it and cause an erratic
arc. Replace the contact tip if
it is badly damaged.
4. Install the contact tip in the
torch and tighten it firmly with
an appropriate wrench.
5. Reinstall the torch nozzle.
6. If the wire continues to burn
back, check for erratic wire
feed, or speed up the wire by
increasing the WIRE SPEED con-
trol setting or reducing the
VOLTAGE control setting.
SPATTER
Before beginning to weld and
periodically during welding, the
torch nozzle must be removed and the
spatter (small globules of melted
metal) cleared from the inside of
the nozzle and the outside of the
contact tip and the gas diffuser.
Spatter buildup between the contact
tip and the nozzle can cause a short
circuit and consequently, failure
of the torch or welding machine.
The frequent use of anti-spatter
spray will help prevent the adher-
ence of spatter to the torch compo-
nents.
NOTE
DO NOT use any anti-spatter
spray when welding aluminum or
stainless steel.
Restricted gas flow, holding the
torch too far from the work piece,
and the use of CO2 gas rather than
75% Argon - 25% CO2 will increase
the spatter levels.
MAINTENANCE
To ensure that this equipment
maintains its operating effi-
ciency, the following maintenance
schedule and procedures are recom-
mended. These routines should be
performed regularly by the opera-
tor.
REGULARLY - Usage and shop condi-
tions determine frequency.
1. Remove and clean the torch
nozzle and contact tip. The use
of anti-spatter spray will re-
duce the adherence of spatter
and makes its removal easier.
2. Blow out the torch liner prior to
the installation of each new
spool of wire. The contact tip
and gas diffuser must be re-
moved, but it is not necessary to
remove the liner.
3. If the torch cable assembly is
bent severely, a kink may de-
velop in the steel liner. This
can cause wire feeding problems
so a new liner should be in-
stalled.
WEEKLY
Remove dirt and dust from the wire
feed compartment. Use low pressure
dry compressed air.
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