I do a little TIG welding. The electrodes are made of mostly tungsten. (Tungsten is used for its high melting point. Lanthanum or some other elements are oft

I do a little TIG welding. The electrodes are made of mostly tungsten. (Tungsten is used for its high melting point. Lanthanum or some other elements are often added to raise the melting point somewhat.) The electrodes aren't very big, but the density is definitely weird.