How to "Correctly" Grind, Cut & Prepare Tungsten Welding Electrodes (11 pages)
DIAMOND GROUND PRODUCTS
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EWCE ELECTRODE CLASSIFICATION (ORANGE STRIPE)
Tungsten electrodes were first introduced into the United States market in the early 1980's. These
electrodes were developed as possible replacements for Thoriated electrodes because cerium, unlike
thorium, is not a radioactive element. The EWCe-2 electrodes are tungsten electrodes containing 2
percent cerium oxide (CEO2), referred to as ceria. Compared with pure tungsten, the Ceriated electrodes
exhibit a reduced rate of vaporization or burn-off. These advantages of ceria improve with increased ceria
content. EWCe-2 electrodes will operate successfully with AC or DC.
EWLA ELECTRODE CLASSIFICATION
The EWLa-1 electrodes were developed around the same time as the Ceriated electrodes and for the
same reason, that lanthanum is not radioactive. These electrodes contain 2 percent lanthanum oxides
(La203), referred to as lanthana. The advantages and operating characteristics of these electrodes are
very similar to the Ceriated tungsten electrodes, also called rare earth.
EWZR ELECTRODE CLASSIFICATION (BROWN STRIPE)
Zirconiated tungsten electrodes (EWZr) contain a small amount of zirconium oxide (ZrO2). Zirconiated
tungsten electrodes have welding characteristics that generally fall between those of pure and Thoriated
tungsten. They are the electrode of choice for AC welding because they combine the desirable arc
stability characteristics and balled end typical of pure tungsten with the current capacity and starting
characteristics of Thoriated tungsten. They have higher resistance to contamination than pure tungsten.