MICROSCOPIC CRACK PROGRESS PREVENTIVE METHOD AND EARTH ABRASION RESISTANT PART OBTAINED BY APPLYING ITS METHOD

摘要

PROBLEM TO BE SOLVED: To prevent progress of a crack by applying a pastelike powdery brazing material containing flux to a surface part where at least a microscopic crack is generated, and permeating the brazing material inside the microscopic crack by melting the brazing material by heat treating thereafter. SOLUTION: A pastelike powdery brazing material containing flux is applied to a surface part of a repairing object material containing a microscopic crack generated in hardfacing part or a crack progressing up to a base material. The brazing material is melted by heat treating thereafter, and the brazing material is permeated inside the microscopic crack. Therefore, the repairing object material is repaired. In this case, the flux has a function of improving wettability of the brazing material by reducing a thin oxide film inside of the crack, and can permetate the brazing material up to the crack tip by a capillary phenomenon without performing special treatment.