They do have a process of welding now called plasma welding. And as soon as welded you mayput your finger on it and its just warm. You may do some research on that.Or someone here might know the
information on it.And post for everyone to see. I do have a German Mauser sporter that I bought
from a fellow in or involved with NASA.And 3 side mount scope mount hole had been welded shut
the bead ? or filler is still on the rifle. And except for exactly where the weld filler is.There was no bluing damage at all.??? Whitey