Lincoln Electric 225 Recommended, Course of Action, TIG Mode Problems, Field Service Facility

E-4		TROUBLESHOOTING		E-4
	Observe all Safety Guidelines detailed throughout this manual
	PROBLEMS		POSSIBLE	RECOMMENDED
	(SYMPTOMS)		CAUSE	COURSE OF ACTION
			TIG MODE PROBLEMS
Machine output is intermittently lost.		1.	Problem may be caused by high
Gas flow and high frequency are			frequency interference. Make sure
also interrupted.			that the machine is grounded
			properly according to the installa-
			tion instructions. If there are other
			high frequency sources in the
			area, make certain that they are
			grounded properly.
		2.	Check Amptrol for proper opera-
			tion and loose connections.
		3.	Check to make sure that the input	If all recommended possible areas of
			voltage is correct for the machine	misadjustment have been checked
			reconnect configuration. Refer to	and the problem persists, Contact
			Reconnect Procedure in the	your local Lincoln Authorized
			Installation section of this report.	Field Service Facility.
Arc “Flutters” when TIG welding.		1.	Tungsten electrode may be too
			large in diameter for the current
			setting.
		2.	Tungsten not “sharp” when weld-
			ing in DC - mode.
		3.	Gas shielding may be insufficient.
			Increase gas flow; reduce tung-
			sten stickout beyond gas cup.
		4.	Check for contaminated gas or
			leaks in the gas line, torch, or con-
			nections.
		5.	If a helium blend is used as a
			shielding gas, then reduce the
			percentage of helium.
Arc “Pulsates” when AC TIG weld-		1.	Make sure the gas and procedure
ing.			are correct for the process being
			used.
		2.	Micro Switch mounted on Polarity
			Switch is not opening in “AC”
			mode.

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.

PRECISION TIG 225