Perfectly Sharpen Tungsten for TIG Welding! : 3 Steps ...
If you grind your electrode on a wheel that is shared by steel, you run the risk of embedding contaminants in the tungsten. Now, just as you would normally grind your tungsten (always leaving the grains from grinding, lengthwise) and making the length of the pointed cone about 2x the diameter of the electrode. Remember to nip the tip off the pointed cone so it doesn't blow off into the weld ...