18
1. Use a dedicated grinding
wheel or contamination may re-
sult. Do not breath grinding dust!
Wear eye protection and gloves.
2. Hold Tungsten firmly.
3. Grind perpendicular to grind-
ing wheel face. Allow tungsten to
grind away slowly, creating point.
4. Rotate tungsten quickly as it is
being ground to keep point even
and symmetrical.
DO NOT GRIND TUNGSTEN
PARALLEL TO WHEEL FACE OR
AN UNSTABLE ARC WILL RESULT.
Use a point for low amp use to
help control arc. Create a slight
truncation on the tip for higher
amp use for best arc stability.
Grind the tip so that it is 2.5- 3
times longer than the tungsten is
wide (Diameter).
DO NOT BALL TUNGSTEN WHILE
USING AC. ERRATIC ARC WILL RE-
SULT. MAKE SURE GRINDING
MARKS RUN PARALLEL TO TIP.
CONCENTRIC MARKS WILL CAUSE
AN ERRATIC ARC.
<50 A
>50 A
2.5
–
3
X Ø (DIAMETER)
TUNGSTEN PREPARATION
NEVER USE PURE (GREEN) TUNGSTEN IN AN INVERTER WELDER.
GENERAL SETUP AND OPERATION
Section 2
Summary of Contents for POWERARC 140ST
Page 21: ...21 NOTES...
