Band saw welding machine, grinding machine and special square cutter for optimum connecting of band saw blades 50 to 150 mm wide. The complete machine set is from the company IDEAL, Lippstadt. It cuts band saw blades burr-free and at right angles and welds the blades in seconds using the optimum flash-butt welding process without foreign matter in the weld and with a homogeneous weld seam structure of the highest quality and stability. Welding current and annealing current can be selected in 6 switching steps. With the grinding machine IDEAL the welding seams are plane grinded.