7-3. Preparing Tungsten For AC Or 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

Grinding wheel should be dedi-

 

 

cated to grinding tungsten only.

 

 

4

Straight Ground

 

4

 

 

Ideal Tungsten Preparation − Stable Arc

 

 

 

 

1

Arc Wander

 

1

2

Point

 

3

Grinding Wheel

 

 

 

 

Grinding wheel should be dedi-

 

2

cated to grinding tungsten only.

 

4

Radial Ground

 

 

 

3

 

 

 

4

 

 

Wrong Tungsten Preparation − Wandering Arc

 

 

 

 

 

Ref. S-0161 / Ref. S-0162

OM-220 812 Page 28

Page 32
Image 32
Miller Electric CST 250 VRD manual Tungsten Electrode