Ok, who does it. Who welds right on the machine?
When I was first learning to setup and run my first CNC mill (a Taig 2019) I sometimes repaired a bad cut in aluminum right on the table by filling it in and then milling it flat. (DC spool gun) Often without shutting down the mill. I don't recall any immediate catastrophic failures, but I sometimes wonder if I was just lucky.
I have never done that on any of my other machines.