Operation - Lincoln Electric K4872-1 Operator's Manual

MAGNUM PRO ® 175L & 250L

OPERATION

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.
WARNING
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts such
as output terminals or
• Insulate yourself from the work and
ground.
• Always wear dry insulating gloves.
FUMES AND GASES can be dan-
gerous.
• Keep your head out of fumes.
• Use ventilation or exhaust to remove
fumes from breathing zone.
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.
internal wiring.
ELECTRODES AND EQUIPMENT.
The MAGNUM ® PRO 175L &250L guns and cables have been
designed for use with Lincoln L- 50 and L-56, solid steel wire
electrodes for the GMAW process and Lincoln Outershield cored
electrodes for the gas-shielded FCAW process. Refer to the
appropriate Lincoln Process and Procedure Guidelines for the
electrode used for information on recommended electrical and
visible stickouts.
MAKING A WELD
WARNING
WHEN USING AN OPEN ARC PROCESS, IT IS NECESSARY
TO USE CORRECT EYE, HEAD, AND BODY PROTECTION.
a. Check that the welding power source is on and that the
shielding gas supply is set for the proper flow rate.
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.
B-1
OPERATION