Miller Electric MARK VIII-2 manual Preparing Tungsten For DC Electrode Negative Dcen Welding

8-2. Preparing Tungsten For AC Or DC Electrode Positive (DCEP) Welding

1

1-1/2 Times

Electrode Diameter

2

1Tungsten Electrode

2Balled End

YUnderstand and follow safety symbols at start of Section 9-1before preparing tungsten.

Ball end of tungsten before welding by applying either an ac amperage slightly higher than what is recom- mended for a given electrode diam- eter (see Section 8-1), or a dc electrode positive amperage.

Ref. S-0161

8-3. Preparing Tungsten For DC Electrode Negative (DCEN) Welding

		1	Tungsten Electrode
1	2	2	Tapered End
		Grind end of tungsten on fine grit,
		hard abrasive wheel before weld-
		ing. Do not use wheel for other jobs
		or tungsten can become contami-
		nated causing lower weld quality.
	2-1/2 Times
	Electrode Diameter
		1	Stable Arc
	1	2	Flat
		Diameter of this flat determines
	2	amperage capacity.
		3	Grinding Wheel
	3	4	Straight Ground
	4
Ideal Tungsten Preparation − Stable Arc
		1	Arc Wander
	1	2	Point
		3	Grinding Wheel
		4	Radial Ground
	2
	3
	4

Wrong Tungsten Preparation − Wandering Arc

Ref. S-0161 / Ref. S-0162

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