Miller Electric 350 VS manual Lift-Arc TIG Procedure, Stick Start Procedure, Low OCV Stick

5-4. Lift-Arc TIG Procedure

1 2

1 − 2

“Touch” Seconds

Do NOT Strike Like A Match!

With Process Switch in the Lift-Arc TIG position, start an arc as follows:

1TIG Electrode

2Workpiece

Touch tungsten electrode to work- piece at weld start point, hold electrode to workpiece for 1-2 seconds, and slowly lift electrode. An arc will form when electrode is lifted.

Normal open-circuit voltage is not present before tungsten electrode touches workpiece; only a low sensing voltage is present between electrode and workpiece. The solid-state output contactor does not energize until after electrode is touching workpiece. This allows electrode to touch workpiece with- out overheating, sticking, or getting contaminated.

Ref. S-156 279

5-5. Stick Start Procedure

With Stick selected, start arc as fol-

lows:

1 Electrode 2 Workpiece 3 Arc

Drag electrode across workpiece like striking a match; lift electrode slightly after touching work. If arc

1goes out electrode was lifted to high. If electrode sticks to workpiece, use a quick twist to free it.

	Low OCV Stick
	The unit can be optionally config-
2	ured for low open circuit voltage
	(OCV) operation. When the unit is
	configured for low OCV operation
3	only a low sensing voltage (approxi-
	mately 15 VDC) is present between

the electrode and the workpiece prior to the electrode touching the workpiece. Consult a Factory Authorized Service Agent for infor- mation regarding how to configure the unit for low OCV stick welding operation.

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