Lincoln Electric SVM169-A service manual TIG Welding Problems

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

F-10	TROUBLESHOOTING & REPAIR			F-10
TROUBLESHOOTING GUIDE			Observe Safety Guidelines
		detailed in the beginning of this manual.
	PROBLEMS	POSSIBLE AREAS OF	RECOMMENDED
	(SYMPTOMS)	MISADJUSTMENT(S)	COURSE OF ACTION
		TIG WELDING PROBLEMS
Black areas along weld bead.		1. Clean any oily or organic conta-	1. This may be a welding proce-
		mination from the work piece.	dure problem.

2.Tungsten electrode may be cont- Contact The Lincoln Electric Service aminated. Replace or sharpen. Department, 1-888-935-3877.

3.Check for contaminated gas or leaks in the gas line, torch, or associated connections.

4.The gas shielding may be insuffi- cient. Increase gas flow: reduce tungsten stickout beyond the gas cup.

Weak high frequency - machine has 1.	Check for loose or faulty connec-	1.	Make sure that 115VAC is being
normal welding.	tions at the torch and/or welding		applied to the primary of the high
	cables.		voltage transformer (T3). See
			wiring diagram.
2. The gas shielding may be insuffi-
	cient. Increase gas flow: reduce	2.	Check for any open or arcing
	tungsten stickout beyond the gas		high frequency component.
	cup.		Replace as required.
			(Examples: C3, R3, C4)
3. Check spark gap operation and
	setting. Normal is (0.015").
	Refer to Maintenance section of	3.	If spark is weak at the spark gap,
	this manual.		check or replace the high fre-
			quency circuit.
4.	The work and electrode cables		(Examples: T3, L3, L4).
	may be in poor condition allowing
	the high frequency to "leak off".
	Use good quality cables with a
	high natural rubber content, such
	as Lincoln Stable Arc Cable.
	Cables should be as short as
	possible.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.

PRECISION TIG 185