... melting point ,steady electric arc ,without self-consume .Tungsten increasing 0.15-4% Tho 2 ,Zro 2 ... ,Ceo 2 ,which can reduce the loss of tungsten pole ,prolong its life ,not pollute the welding ... seam ,increase launching ability of tungsten pole electrons and so on Therefore ,the quality ... of welding seam is high. 2. Export tungsten electrodes execute ISO 6848 international standard and AWS5. ...