Model	Oxide addition		Impurites	Tungsten	Color	Standard
	Principal oxide	Contents
WS2	La₂O₃YO₂ZrO₂	1.8-2.2	≤0.1	Blalance		AWS A5.12 ISO6848 EN 26 848

Compound tungsten electrode is aiso known as three elements of rare earth containing 1.2% lanthana, 0.5% zirconia, and 0.5% yttria It is a non-radiation material. It is good to balance the electron mobility and evaporation rates, make tungsten electrodes to maximize their performances For compound tungsten electrode, it's easy to start and restart arc, If the welding cycle is more than 15 minutes, its life will be longer. Compound tungsten electrode is better than others in tip burning. As the mixture of three kinds of oxides in electrode. It's strict with the prod uction process and the cost of production is more expensive.