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Miller HF-251-2 オーナーズマニュアル

7-2. Preparing Tungsten For AC Or DC Electrode Positive (DCEP) Welding

7-3. Preparing Tungsten For DC Electrode Negative (DCEN) Welding

1
1-1/2 Times
Electrode Diameter
2
1
2-1/2 Times
Electrode Diameter
4
Ideal Tungsten Preparation – Stable Arc
4
Wrong Tungsten Preparation – Wandering Arc
2
1
2
3
1
2
3
1
Tungsten Electrode
2
Balled End
Y Understand
and
follow
safety symbols at start of
Section 8-1 before 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 7-1), or a dc
electrode positive amperage.
Ref. S-0161
1
Tungsten Electrode
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.
1
Stable Arc
2
Flat
Diameter of this flat determines
amperage capacity.
3
Grinding Wheel
4
Straight Ground
1
Arc Wander
2
Point
3
Grinding Wheel
4
Radial Ground
Ref. S-0161 / Ref. S-0162
OM-611 Page 25