here's a cheap way to grind Tungsten with a angle grinder that's safe, effective, and won't contaminate your Tungsten before you start welding!
here's the ones I used in the video. you have to take a pair of pliers and remove the brass ring in the middle but they work well.
https://www.ebay.com/itm/2pks-4-5-Wheel-Diamond-Saw-Blade-Ceramic-Tile-Cutting-Disc-Circular-Cutter-Tool-/154547982938?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=711-127632-2357-0
