Galvanized, Something ya really don`t want to cut with a torch or plasma.
The thin stuff he was cutting was track not a stud. Guys in the trade will use the big chop saws with of course abrasive blade. Then grinders to do notches or what ever.
Dust off that stuff is bad, worse with a torch.
I built my garage with structural metal studs, I`d never do it again.
