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41
ZIRCONIATED
(Color Code: White)
Zirconiated tungsten electrodes (AWS classification EWZr-1) contain a
minimum of 99.10% tungsten and 0.15 to 0.40% 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. Zirconiated
tungsten is not recommended for DC welding.
TUNGSTEN ELECTRODES RATING FOR WELDING CURRENTS
TUNGSTEN PREPARATION
Always use a diamond wheel 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. Tungsten electrodes are manufactured with the molecular structure of
the grain running lengthwise and thus grinding crosswise is ‘grinding against
the grain’. 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 with the grain, the electrons flow steadily and easily to
the end of the tungsten tip. The arc starts straight and remains narrow,
concentrated and stable.
Tungsten
Diameter
DC Current Amps
Torch Negative
2% Thoriated
AC Current Amps
UnBalanced Wave
0.8% Zirconiated
AC Current Amps
Balanced Wave
0.8% Zirconiated
3/64 in. (1.2 mm)
15 – 80A
15 – 80A
20 – 60A
1/16 in. (1.6 mm)
70 -150A
70 – 150A
60 – 120A
3/32 in. (2.4 mm)
150- 250A
140 – 235A
100 – 180A
1/8 in. (3.2 mm)
250 – 400A
225 – 325A
160 – 250A
5/32 in. (3.9 mm)
400 – 500A
300 – 400A
200 – 320A
Table 4
