Lincoln Electric IM467-B manual Lower Panel Controls

E-5			E-5
	TROUBLESHOOTING
	TROUBLESHOOTING GUIDE		Observe Safety Guidelines
			detailed throughout this manual.
	TIG WELDING (Continued)
	SYMPTOM		CAUSE AND REMEDY
	Tungsten is eroding quickly.	1. Current potentiometer is set too high for tungsten size.
			Reduce welding current or increase tungsten size.
		2.	In AC, Wave Balance control may be set too far towards
			CLEANING. Turn Balance pot towards PENETRATION, or
			increase tungsten size.
	Tungsten seems to “spit” when Arc Start Switch		High welding current is thermally “shocking” the cold
	or Amptrol is pressed at high currents.		tungsten causing pieces of the end to spall off. Turn Start
			Switch ON, and set Start Current to a value lower than the
			welding current to give a “soft” start.
	LOWER PANEL CONTROLS
	SYMPTOM		CAUSE AND REMEDY
	Machine does not always wait for Preflow time	Machine is operating correctly; it does not go through a
	when starting arc.	Preflow period if the Arc Start Switch or Amptrol is pressed
		during the Afterflow period.
	The Spot Time does not last as long as the	When in the 2-Step mode, be sure to keep the Arc Start Switch or
	nameplate setting.	Amptrol pressed until the Spot Time is completed. Releasing the
		Arc Start Switch before the Spot Timer has timed out will cause
		the arc to go out.
	The Spot Time lasts much longer than the	The Crater Fill switch should be turned OFF. If it is left ON,
	nameplate setting.	the actual weld time will be the spot time plus the crater fill time.
	The Start Current seems very hot.	The Start Current dial is labeled MIN to MAX of the welder
		output or, 2 to 400 amps. Always be sure to use the Start Read
		pushbutton to check the Start Current preset reading on the digital
		ammeter before welding.
	The Pulser does not seem to operate.	1. If Start Controls are used, pulsing does not begin until the
			end of the start time, which can be as much as 10 seconds.
		2.	Check the Pulses Per Second control. If it is set near mini-
			mum, each pulse may be as long as ten seconds. Set all
			three of the pulse controls near the midpoints to see the
			Pulser’s effects.
		3.	The Pulse % On control may be set at either extreme. If that
			is the case, the pulses may be too short to be seen, depend-
			ing on the settings of the Current and Background % Current
			controls. Set all three of the pulse controls near the mid-
			points to see the Pulser’s effects.
	When using Crater Fill, the arc goes out	1. The Crater Fill % Current control may be set too low for the
	before the final Crater Fill Current level		tungsten being used. Increase the Crater Fill % Current con-
	is reached.		trol until the final Crater Fill current is within the tungsten’s
			operating range.
		2.	If using the Pulser in conjunction with the Crater Fill, the
			Background % Current may be too low for the tungsten as
			the current is downsloping in Crater Fill. The best solution is
			to increase the Background % Current level.
		3.	If welding with AC use CONTINUOUS High Frequency. The
			high frequency will stabilize the arc as the current goes
			down.

SQUARE WAVE TIG 355