We had a bandsaw one place I worked with a band welder, it is the only one I have ever used a LOT, it was a good old line saw mfg. but I cannot remember, might have been a marvel, anyway I could not get it to anneal for beans, the propane torch worked GREAT for me, This was with Starrett band stock, I would anneal with the propane torch before grinding flush, and then re-anneal just a touch.
I have seen some that would not weld properly that if you looked inside the little lever that rests on a cam (said cam rotated by a control knob) to adjust either the heat or the mechanism can fall off the cam onto the shaft, then she is wide open all the time for a 3/4" blade. too much heat.
I will remember the silver solder bit tho,
If you wanted to get fancy I think you could mill the angles with a carbide cutter, you could make a jig to hold the blade while milling, maybe use the same jig to silver solder.
Bill