Lincoln Electric IDEALARC SP-255 - Manual (Page 24)

B-12 OPERATION
IDEALARC SP-255 OCT94
3. If the only result was drive roll slippage, loosen the
gun cable Fast-Mate™ connection nut from the
front of the SP-255 and pull the gun cable forward
about 6” (152 mm). There should be a slight wavi-
ness in the exposed wire. If there is no waviness,
the pressure is too low. Tighten the thumbscrew
1/4 turn, lock the gun cable in place and repeat the
above steps.
MAKING AN AUTO MODE WELD
1. Check that the polarity is correct for the process
being used, then turn power switch ON.
2. Press then select:
3. Press then select:
4. If Spot or Stitch timing modes are required, per-
form either step 4.a. for Spot or step 4.b. for
Stitch; otherwise, go to step 5.
4.a.Press then select:
Press again to return to previous
display.
4.b.Press then select:
Press again to return to previous
display.
5. Inch the electrode through the gun and cable and
then cut the electrode within approximately 3/8
inch (9.5 mm) of the end of the contact tip [3/4
inch (19 mm) for Outershield
® electrodes].
6. If welding gas is to be used, turn on the gas sup-
ply and set the required flow rate [typically 25-35
CFH (12-16.5 I/min)].
7. When using Innershield ® electrode, the gas noz-
zle may be removed from the insulation on the
end of the gun and replaced with the gasless noz-
zle. This will give improved visibility and eliminate
the possibility of the gas nozzle overheating.
8. Connect work clamp to metal to be welded. Work
clamp must make good electrical contact to the
work. The work must also be grounded as stated
in “Arc Welding Safety Precautions”.
When using an open arc process, it is necessary
to use correct eye, head, and body protection.
9. Position electrode over joint. End of electrode
may be lightly touching the work.
10. Lower welding helmet, close gun trigger, and
begin welding. Hold the gun so the contact tip to
work distance is about 3/8 inch (9.5 mm), [3/4
inch (19 mm) for Outershield electrodes].
11. To stop welding, release the gun trigger and then
pull the gun away from the work after the arc goes
out.
WARNING