Lincoln Electric IM666-A manual Air. Check for obstructions. Replace

E-2	TROUBLESHOOTING	E-2
	Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

POSSIBLE

CAUSE

RECOMMENDED

COURSE OF ACTION

The drive rolls turn, but wire will not feed	a. Gun cable is kinked and/or twisted.	a. Keep as straight as possible. Inspect
or wire feeding is rough.		cable and replace if necessary.
	b. Wire jammed in gun or cable.	b. Remove wire from gun and cable,
		then feed in new wire. Check for any
		obstructions. Replace the liner if nec-
		essary.
	c. Incorrect drive rolls and guide tubes.	c. Be sure the wire diameter being used
		matches the sizes of the drive rolls
		and guide tubes.
	d. Gun cable liner dirty.	d. Clean or replace liner.
	e. Conduit clogged or dirty.	e. Blow the conduit out with compressed
		air. Check for obstructions. Replace
		conduit if necessary.
	f. Worn drive rolls.	f. Replace or reverse split drive rolls.
	g. Electrode rusty or dirty.	g. Replace the electrode.
	h. Worn or improperly sized cable liner.	h. Replace cable liner.
	i. Partially flashed, melted or improper	i. Replace the contact tip.
	contact tip.
The arc starts, but during the weld the	a. Loose electrode or work lead connec-	a. Verify that all the connections are tight
arc goes out and wire keeps feeding.	tion.	and are not overheating.
	b. The output of the Power Wave is	b. Change the welding procedure to
	being exceeded, and the machine is	reduce the output current.
	"phasing back".
	c. The wrong weld program has been	c. Make sure the welding program on the
	selected.	power source matches the wire size
		and gas actually being run.
Water leaks from the torch.	a. Misassembled torch shield.	a. Assemble the torch shield properly. It
		should be flush with the bottom of the
		barrel.
	b. O-rings on the nozzle are cut, worn or	b. Replace the o-rings.
	torn.
	c. Loose connections where the cables	c. Properly connect the cables to the
	enter the torch.	torch.
Porosity in the weld.	a. The parts to be welded are dirty.	a. Remove dirt, oil, lubricants and scale
		from the part to be welded.
	b. The parts to be welded have a surface	b. Do not weld painted, plated or insula-
	coating.	tion-coated parts.
	c. The arc length is excessively long.	c. Properly set the weld procedure.
		Generally arc lengths do not exceed
		approximately 1/4".
	d. Insufficient shielding gas flow.	d. Verify that the torch is being supplied
		with 65 scfh.
	e. Gas solenoid not turning on.	e. Check that the gas solenoid fully turns
		on during welding.
	f. Loose shielding gas connections.	f. Check that all the connections are
		sealed and that there are no cuts or
		kinks in the shielding gas line.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

TANDEM MIG TORCH