The tooth tips of a blade are required to be hard and the backing to be ductile. These antithetic conditions were cleared by bi - metal blade produce by using special electron beam welding. A blade that is composed of two types of material, that is the highest grade high speed steel for teeth and tough special spring steel for the backing, exhibits the performance that is of no comparision with conventional quench hardened blades high speed, high accuracy and long service life. It can handle hard to cut materials of a wide range, it is stron against bending and torsion, and it makes possible large reduction in the cutting cost.

The tooth tips of a blade are required to be hard and the backing to be ductile. These antithetic conditions were cleared by bi - metal blade produce by using special electron beam welding. A blade that is composed of two types of material, that is the highest grade high speed steel for teeth and tough special spring steel for the backing, exhibits the performance that is of no comparision with conventional quench hardened blades high speed, high accuracy and long service life. It can handle hard to cut materials of a wide range, it is stron against bending and torsion, and it makes possible large reduction in the cutting cost.