Thermal Arc 400 GTSW AC/DC, Operating Manual

Page: 44 / 52

OPERATION 26
3.5 ELECTRODE PREPARATION
AC or DC ELECTRODE
POSITIVE WELDING
DC ELECTRODE
NEGATIVE WELDING
CAUTION
WARNING
Figure 3-G Properly Prepared Tungsten Electrodes
Figure 3-E
Ideal Electrtode Preparation
Figure 3-F
Incorrect Electrtode Preparation
Ball the end of tungsten electrode used for AC or DC electrode
positive welding before beginning the welding operation. Weld
amperage causes the tungsten electrode to form the ball end. The
diameter of the end should not exceed the diameter of the tung-
sten electrode by more than 1 1/2 times.
A point can be used on tungsten in the AC mode when the
CLEANING (balance) control is set at 20% or less.
Grind the end of the tungsten electrode to a taper for a distance of
2 to 2 1/2 electrode diameter in length.
HOT FLYING METAL PARTICALS CAN INJURE PERSONNEL,
START FIRES AND DAMAGE EQUIPMENT.
HIGH CONCENTRATION OF SHIELDING GAS can harm
health or kill. Shut off gas supply when not in use.
Ground to
a Point
Ground Radial
Arc Wanders
Electrode
A-00236
Flat End
(Diameter determines
Amperage Capacity)
Ground Straight
Stable Arc
Electrode
A-00235
A-00330
Electrode
1-1/2 Times
Electrode Diameter
AC and DC
Electrode Positive
Electrode
2 to 2-1/2 Times
Electrode Diameter
DC Electrode
Negative
AC Electrode
Cleaning Control 20% or Less
2 to 2-1/2 Times
Electrode Diameter
Electrode