Rare Earth Tungsten Electrodes (AWS classification EWG) contain a minimum of 98% per cent tungsten and up to 1.5 per cent Lanthanum and small percentages of Zirconium and Yttrium they are called T3 Tungsten. ... They can be used DC electrode positive or negative with a pointed end, or balled for use with AC power sources.
What color is rare earth tungsten?
gray
What is the purple tungsten?
The purple tungsten really is a true non-radioactive alternative to the thoriated tungsten electode.