OM-275857 Page 78
14-2. Preparing Tungsten Electrode For DC Electrode Negative (DCEN) Welding Or AC
Welding With Inverter Machines
Wrong Tungsten Preparation — Radial Grinding Causes Wandering Arc
OM-
1-1.
Preparing Tungsten Electrode For DC Electrode Negative (DCEN) Welding
Or AC Welding With Inverter Machines
Grinding the tungsten electrode produces dust and flying sparks which can cause injury and start fires.
Use local exhaust (forced ventilation) at the grinder or wear an approved respirator. Read MSDS for safety
information. Consider using tungsten containing ceria, lanthana, or yttria instead of thoria. Grinding dust
from thoriated electrodes contains low-level radioactive material. Properly dispose of grinder dust in an
environmentally safe way. Wear proper face, hand, and body protection. Keep flammables away.
1
3
2
15
°
30
°
4
5
Better Tungsten Preparation — Stable Arc
°
°
6
Best Tungsten Preparation — Dedicated Tungsten Grinder
Grinding the tungsten electrode
produces dust and flying sparks
which can cause injury and start
fires. Use appropriate local ex-
haust (forced ventilation) at the
grinder or wear an approved respi-
rator. Read SDS for safety informa-
tion. Properly dispose of grinder
dust in an environmentally safe
way. Wear proper face, hand, and
body protection. Keep flammables
away.
Do not use thoriated tungsten. Use
tungsten containing ceria, lantha-
na, or yttria instead of thoria.
Grinding dust from thoriated elec-
trodes contains low-level radioac-
tive material.
�
It is recommended to prepare tungsten
with a tungsten grinder designed for
that purpose whenever possible.
1
Grinding Wheel
Grind end of tungsten on fine grit, hard abra-
sive wheel before welding. Do not use wheel
for other jobs or tungsten can become conta-
minated causing lower weld quality.
2
Tungsten Electrode
A 2% ceriated tungsten is recommended.
3
Ideal Grind Angle Range: 15° to 30°
�
30 degrees is the recommended elec-
trode grind angle.
4
Straight Ground
Grind lengthwise, not radial.
5
1–1/2 to 4 Times Electrode Diameter
6
Straight Ground Tip
�
Blunting the tip of the electrode is
sometimes done to help maintain con-
sistent geometry and resist tungsten
erosion. This is especially helpful in AC
when melt-back of the tungsten elec-
trode is common.
Summary of Contents for Dynasty 400
Page 78: ...OM 275857 Page 68 275852 H Figure 12 2 Dynasty 400 Circuit Diagram Page 2 of 2...
Page 80: ...OM 275857 Page 70 Figure 12 4 Maxstar 400 Circuit Diagram Page 2 of 2...
Page 81: ...OM 275857 Page 71 275854 G Figure 12 5 Dynasty 800 Circuit Diagram Page 1 of 2...
Page 82: ...OM 275857 Page 72 275854 G Figure 12 6 Dynasty 800 Circuit Diagram Page 2 of 2...
Page 83: ...OM 275857 Page 73 Figure 12 7 Maxstar 800 Circuit Diagram Page 1 of 2...
