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B-1
OPERATION
Electrodes and Equipment
The MAGNUM® 550 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 flux-cored process. Refer to the appropriate
Lincoln Process and Procedure Guidelines for the
electrode used for information on recommended elec-
trical and visible stickouts.
Making a Weld
WARNING
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
• Insulate yourself from work and
ground.
• Always wear dry insulating gloves.
------------------------------------------------------------------------
FUMES AND GASES can be danger-
ous.
• 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.
• Do not weld on closed containers.
------------------------------------------------------------------------
ARC RAYS can burn eyes and skin.
• Wear eye, ear and body
protection.
------------------------------------------------------------
See additional warning information at
front of this operatorʼs manual.
-----------------------------------------------------------
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.
OPERATION
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.
e. If the optional interlocking trigger is installed, the
trigger operates as follows:
- Pull the trigger in to engage the feeder.
- With the trigger pulled in all the way, the trigger
can be slid forward into the interlock position.
- To release interlock, squeeze trigger and pull
back.
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 25 ft. (7.5m)
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.
h. When using aluminum electrodes, 10 ft. maximum
cable length is recommended. If longer cable
lengths are used, cable should be kept as straight
as possible.
MAGNUM® 550
B-1
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