Method for manufacturing cutting tool

摘要

A circular saw blade (10) is obtained by joining a cutting edge tip (21) made of a hard material to a base (13) of a body metal (11) made of steel containing a carbon content of 0.5 mass% or more. A laser beam of a fiber laser (23) is irradiated to melt the base (13) and form a joint with the cutting edge tip (21), and the laser beam is irradiated again to maintain Vickers' hardness of the body metal (11) below 700 HV. The tempering process is performed by an output lower than an output of the fiber laser (23) in the welding process, by shifting a focus of the fiber laser (23), or a combination thereof.