Lincoln Electric 450, 250 manual Operation, ElectroDes AnD equiPment

C-1 OPERATION C-1

electroDes AnD equiPment

The MAGNUM® PRO 250, 350, 450 & 550 Amp 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.

mAking A WelD

WARNING

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.

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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.

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ARC RAYS can burn.

• Wear eye, ear and body protection.

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Only qualified personnel should operate this equipment.

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.

e.If the optional interlocking trigger is installed.

-With the trigger pulled in all the way, the trigger can be slid forward into the interlock position.

-To release the interlock, squeeze the 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 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 instruc- tions.

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.

MAGNUM® PRO 250, 350, 450 & 550 AMP