WEAR RESISTANT CLADDING LAYER BY WELDING AND CLADDING MATERIAL BY WELDING

摘要

PROBLEM TO BE SOLVED: To always guarantee high wear resistance by universally preparing the hardness of a fixed level or more even in any section of cladding by welding at the time of forming high hard cladding layer on a base material by PTA welding or the like. ;SOLUTION: This layer is composed of a micro structure mainly consisting of a base of Ni or Fe and a ternary multiple compound or precepitation of W, Cr and B. For example, when a powder plasma arc welding method is used, powder of tungsten carbide and chromium boride of 40-80 weight % is incorporated in powder of Ni or Fe, and moreover although the weight % of tungsten carbide in composite powder is always larger than that of chromium boride, chromium boride itself of 10-30 weight % is definitely incorporated. Whereby, extremely high hardness for the cladding layer by welding is obtained and moreover the difference of hardness in the vertical direction within the layer is always controlled to a slight difference.;COPYRIGHT: (C)1999,JPO