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Welding Support ANSI Classification Printer-Friendly Page Back To Welding Help Tungsten electrodes are classified on the basis of their chemical compositions. E: Stands for Electrode W: stands for the chemical symbol for tungsten (also called Wolfram) The final letter indicates the alloying element or oxide additions. P: Pure Zr: Zirconiated Th: Thoriated Ce: Ceriated La: Lanthanated G: stands for unspecified oxide additions The numbers specify the nominal alloying composition (in weight by percent). For instance, EWTH-2 is a thoriated tungsten electrode that contains nominally 2% thoria.

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