well at work anymore, i machine d-2 blocks and braze carbide on them. they are hammer mill blades that pulverize cement. we use a silver alloy brazing strip, clip a piece off, coat everything in flux, and heat the whole thing up with a rosebud. watch the brazing mat'l run out, let it air cool, and its solid. now it's gonna be on there and you'll grind it flat and square.