Carbide Overlay


An overlay is a process that bonds one or more metals to a base metal via welding. In the case of a grinding bit, the steel forging is the base metal and the overlay that is applied to the forging consists of abrasion resistant weld wire and carbide particles. During application, the weld wire and forging are heated creating a weld pool. Carbide particles of various grit sizes are introduced into this weld pool which metalurgically bonds to the steel forging. When the weld cools, the carbide is locked into place within and on the surface of the weld. The carbide overlay provides the wear resistant protection needed to prolong the service life of a grinding bit.