I am new to tig welding but I think I am getting pretty good. I can already weld aluminum pretty well. However one thing I can not figure out. Sometimes when I am welding the arc gets very bright. So bright it blinds me inside the helmet that I can not see past the flash to see the puddle. Is it contamination burning on the tungsten or the arc coming up the side on the tungsten? I would be very grateful of what in the heck this is. I have noticed it mostly on steel and in particular stainless.