Lincoln Electric IM616 K1614-12 & -13 MAGNUM 250 NR FM Fast-Mate Gun and Cable - Manual (Page 10)

C-1 OPERATION C-1
MAGNUM® 250 NR FM
ELECTRODES AND EQUIPMENT
The Magnum® 250 NR FM guns and cables have
been designed for use with .035 thru .068 diameter
Innershield electrodes. Refer to the appropriate
Lincoln Process and Procedure Guidelines for the
electrode used for information on recommended elec-
trical stickouts.
MAKING A WELD
Do not attempt to use this equipment until you
have thoroughly read all operating and mainte-
nance manuals supplied with your machine. They
include important safety precautions, detailed
engine starting, operating and maintenance
instructions and parts lists.
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts
such as output terminals or
internal wiring.
• Insulate yourself from the work
and ground.
• Always wear dry insulating gloves.
------------------------------------------------------------------------
FUMES AND GASES can be
dangerous.
• Keep your head out of fumes.
• Use ventilation or exhaust to
remove fumes from breathing zone.
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WELDING SPARKS can cause fire or
explosion.
• Keep flammable material away.
------------------------------------------------------------------------
ARC RAYS can burn.
• Wear eye, ear and body protection.
------------------------------------------------------------------------
Only qualified personnel should operate this
equipment.
a. Check that the welding power source is on.
b. Position electrode over joint. End of the electrode
should be slightly off the work.
c. Lower welding helmet. close gun trigger and begin
welding. Hold the gun so the contact tip to work
distance gives the correct electrical stickout as
required for the procedure being used.
d. To stop welding, release the gun trigger and then
pull the gun away from the work after the arc goes
out. Follow wire feeder instruction manual if using a
trigger interlock circuit.
AVOIDING WIRE FEEDING PROBLEMS
Wire feeding problems can be avoided by observing
the following gun handling procedures:
a. Do not kink or pull cable around sharp corners.
b. Keep the electrode cable as straight as possible
when welding or loading electrode through cable.
c. Avoid wrapping excess cable around handle or
front of wire feeder especially on longer 20 and 25
ft (6.1 and 7.6 mm) length guns.
d. Do not allow dolly wheels or trucks to run over
cables.
e. Keep cable clean by following maintenance
instructions.
f. Use only clean, rust-free electrode. The Lincoln
electrodes have proper surface lubrication.
g. Replace contact tip when the arc starts to become
unstable or the contact tip end is fused or
deformed.
WARNING