Pure tungsten electrode (EWP: green stripes) Pure tungsten electrodes containing tungsten minimum 99.5%, no alloying elements. The stability of the pure tungsten has a very high electron work function, compared to other alloying tungsten electrode, pure tungsten electrode arcing harder to maintain the arc beam also harder. Further, since having a higher electron work function, the higher the temperature of the electrode tip and prone grains grow, this will lead to instability in the arc beam arcing harder, and life shorter. Pure tungsten is used only for AC welding, however, a good DC can also choose.