2% thoriated tungsten contains a nominal 2wt-% or thorium oxide (ThO2) that  is evenly dispersed throughout the entire length of the tungsten. The most  common type of tungsten used today. Provides excellent resistance from weld pool  contamination while at the same time offers the welder easier arc starting  capabilities and a more stable arc. Generally used for DC electrode negative or  straight polarity applications such as carbon and stainless steels, nickel  alloys and titanium.