This welder is a special lever pressure type saw blade welding machine and during welding of saw blades, it needs no weld paste or solder, it is characterized by an extremely short welding duration and the low energy consumption, and in merely several seconds after being energized, it can surely weld saw blades together. It is low in cost and the quality of the resulted weld is greatly superior to that generated but traditional silver soldering or oxygen welding procedures.