Silver solder is used to braze band saw blades. The ends to be brazed should be scarfed to a good, sharp edge. The length of the scarf depends on the width of the saw blade. Ribbon silver solder should be applied between the surfaces to be brazed or soldered, using a prepared flux, or damp, powdered borax. Apply the heat of the torch carefully, and as the solder melts, clamp the beveled edges together. Let the joint cool gradually and finish by grinding or filing as needed.
Another method is to scarf the edges of the saw blade, coat the edges with a thin paste of brazing flux mixed with water, and insert a small piece of thin, ribbon silver solder between the edges. The joint is held securely in a jig. A heavy pair of tongs, with thick jaws made for this purpose, is placed in the forge, or heated with a torch until red hot. The joint is then gripped with the hot tongs and held until the silver solder is melted and cooled. The surfaces and silver solder are not oxidized in this method, and the joint is a strong one if carefully made.
Many band saw machines are fitted with resistance butt welders for butt welding the saw blades. When used according to instructions, butt welding is simpler and faster than the brazing method, and produces equally strong joints.