Lincoln Electric 300FM, 400FM manual Operation

C-1 OPERATION C-1

OPERATION

ELECTRODES AND EQUIPMENT

The Magnum® 300 FM and Magnum® 400 FM 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 appro- priate Lincoln Process and Procedure Guidelines for the electrode used for information on recommended electrical and visible stickouts.

For best results when welding mild and alloy steels, it is recommended that L-50 or L-56 Lincoln solid wire electrodes be used for the GMAW process and Lincoln Outershield® cored electrodes for the gas-shielded FCAW process.

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.

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.

ARC RAYS can burn.

• Wear eye, ear 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 dis- tance 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 the cable around sharp corners.

b)Keep the electrode cable as straight as possible when welding or loading electrode through the cable.

c)Avoid wrapping excess cable around the handle or front of the wire feeder especially on longer 20 and 25 foot (6.0 and 7.5 m) length guns.

d)Do not allow dolly wheels or trucks to run over the cables.

e)Keep the cable clean by following the maintenance instructions.

f)Use only clean, rust-free electrode. All the recom- mended Lincoln electrodes have the proper surface lubrication.

g)Replace the contact tip when the arc starts to become unstable or the contact tip end is fused or deformed.

MAGNUM® FAST-MATE™