STRONG WE3 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. Rare Earth Tungsten Electrodes provide conductivity similar to that of thoriated electrodes. Typically, this means that Rare Earth Tungsten Electrodes are exchangeable with thoriated electrodes without requiring significant welding process changes.