Kontact

I'm sure it is - among people that have welders. I've never seen a bike shop that has one, and most home mechanics don't either. (Yes, I know frame builders are sometimes part of bike shops.)

It's just odd when people are at a level of proficiency that they are asking about doing common bike tasks on a forum, yet the responses assume that they have lathes, welders and other things that would indicate a much greater mechanical proficiency in general.

And even then, I'll bet that trying to weld out a thin bearing race in an aluminum freehub of that inner diameter is not going to go as well as that video.