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current-carrying capacity is equal to or greater than that of
thoriated tungsten. Zirconiated tungsten is not recommended
for DC welding.
TUNGSTEN ELECTRODES RATING
FOR WELDING CURRENTS
Tungsten
Diameter
3/64 in. (1.2 mm)
1/16 in. (1.6 mm)
3/32 in. (2.4 mm)
1/8 in. (3.2 mm)
5/32 in. (3.9 mm)
TUNGSTEN PREPARATION
Always use a diamond wheels
when grinding and cutting. While
tungsten is a very hard material,
the surface of a diamond wheel is
harder, and this makes for smooth
grinding. Grinding without
diamond wheels, such as aluminum
oxide wheels, can lead to jagged
edges, imperfections, or poor
surface finishes not visible to the
eye that will contribute to weld
inconsistency and weld defects.
Always ensure to grind the tungsten in a longitudinal direction
on the grinding wheel (Fig. 24). Tungsten electrodes are
manufactured with the molecular structure of the grain running
lengthwise and thus grinding crosswise is 'grinding against the
grain' (Fig. 24). If electrodes are ground crosswise, the
electrons have to jump across the grinding marks and the arc
can start before the tip and wander. Grinding longitudinally
36
ARC 170 DUAL VOLTAGE ARC/TIG WELDER
DC Current
Amps Torch
Negative
2%
15 – 80A
70 -150A
150- 250A
250 – 400A
400 – 500A
For technical questions call 1-800-665-8685
AC Current
Amps
UnBalanced
Wave 0 8%
15 – 80A
70 – 150A
140 – 235A
225 – 325A
300 – 400A
V1.0
AC Current
Amps
Balanced
Wave 0 8%
20 – 60A
60 – 120A
100 – 180A
160 – 250A
200 – 320A
Fig. 24
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