By military bolt handles, do you perhaps mean older era military BA rifles that you are sporterizing? If that is the case, knowing the metallurgy of the bolt(s) in question is an absolute must for a proper TIG welding process, FYI.. RWTF
LOL. What brand of TIG do you suppose Niedner ran in his shop and how much was a tank of argon back then?
Point being TIG (& MiG) weren't around when sporterizing bolt handles was pioneered. When did Miller or Lincoln start selling TIG and MIG machines? All these classic bolts were welded by "primitive" processes. A stick or torch obviously worked just fine. I'd say just about any reasonably competent welder can do it (by TIG, MiG, stick or however) if you provide a jig and tell them not to get the lugs hot. If you go to someone local you can watch and make sure they have the alignment how you want it.
