I think the plans are from a Popular Mechanics book my father had 60 yrs ago, so it's pretty old technology.
Recently I got given a relatively new stand alone band saw blade welder that had some faults and got it fixed by electricians at a welder-service shop, but, alas, haven't had much luck in getting good welds, mostly from my inability to control the annealing.? I am assured the welder is as its maker intended. It's not the first instance of blade butt welders being difficult to get good results from, that?I've heard of.
My point is that you're maybe going to build an old design welder that will be difficult to get all the right pieces for, and then probably just as difficult to get working properly.??
I think you'd be better off spending a bit more time jigging the blade for brazing, and then using the right braze (I'd be using 630*C melting point silver solder). There are some neat grinding jigs on YouTube to get the scarf right - jv
