Hobart Welding Products POWERPAK OM-478 - Manual (Page 65)

OM-478 Page 61
13-2. Preparing Tungsten For AC Or DC Electrode Positive (DCEP) Welding
Ref. S-0161
1 Tungsten Electrode
2 Balled End
Y Understand and follow
safety symbols at start of
Section 14-1 before pre-
paring 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 13-1), or a dc
electrode positive amperage.
1
1-1/2 Times
2
Electrode Diameter
13-3. Preparing Tungsten For DC Electrode Negative (DCEN) Welding
Ref. S-0161 / Ref. S-0162
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.
3
Ideal Tungsten Preparation – Stable Arc
2-1/2 Times
Electrode Diameter
1 2
1 Stable Arc
2 Flat
Diameter of this flat determines
amperage capacity.
3 Grinding Wheel
4 Straight Ground 3
1
2
1 Arc Wander
2 Point
3 Grinding Wheel
4 Radial Ground
2
1
4
Wrong Tungsten Preparation – Wandering Arc
4