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I would think it depends on the type of tungsten, I weld mostly stainless so I use red band which usually never gets red when I grind it, now my green band tungsten does but it hasn't affected my welding
It get's way hotter than that when welding with it. And you reuse it for more than one welding session. So in light of that, anything you do to it with a grinding wheel (as far as heat is concerned) isn't going to damage it in any way.