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sources. Lanthanated tungsten maintains a sharpened point well, which is an
advantage for welding steel and stainless steel on DC or AC from square wave
power sources.
ZIRCONIATED
Color Brown (0.15 to 0.5%), White (0.7 to 0.9%), AC Welding Only
Zirconiated tungsten electrodes (AWS classification EWZr-1) contain a minimum
of 99.10% tungsten and 0.15 to 0.9% zirconium. Most commonly used for AC
welding, zirconiated tungsten produces a very stable arc and is resistant to
tungsten spitting. It is ideal for AC welding because it retains a balled tip and has
a high resistance to contamination. Its current-carrying capacity is equal to or
greater than that of thoriated tungsten.
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 wheel when grinding and cutting. While tungsten is a
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. 21). Tungsten electrodes are
manufactured with the molecular structure
of the grain running lengthwise and thus
grinding crosswise is 'grinding against the
32
AC/DC Inverter TIG/Arc Welder
DC Current Amps
Torch Negative
2% Thoriated
15 to 80A
70 to 150A
150 to 250A
250 to 400A
400 to 500A
AC Current Amps
UnBalanced Wave
0.8% Zirconiated
15 to 80A
70 to 150A
140 to 235A
225 to 325A
300 to 400A
For technical questions call 1-800-665-8685
V1.0
AC Current Amps
Balanced Wave 0.8%
Zirconiated
20 to 60A
60 to 120A
100 to 180A
160 to 250A
200 to 320A
Table 4
Fig. 21
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