Increased cutting speeds, new thin-cutting techniques and longer lifecycles of saw blades are demanded by the customers in the tool industry. Main impact comes from the quality of the brazing process, the tool design and the selection of the hardmetal and brazing alloy.

A sandwich brazing alloy is commonly used to reduce the resulting stress to the hardmetall after brazing by plastic deformation of the copper interlayer during the cooling process. The deformation capacity of the interlayer is in conflict with reaching high shear strength values. Therefore strenght value and deformation capability of the interlayer determine the joint strength and reliability.

A newly developed sandwich brazing alloy balances the property of stress reduction with concurrent capability of high shear strength to higher performance. Tests of  raw wood cutting applications confirmed increased reliability of the used saw blades. All brazed hard metal teeth reached functional zero defect level over the whole lifetime.