OVERLAY WELDING METHOD BY PLASMA POWDER WITH HIGH ABRASION RESISTANCE AND CORROSION RESISTANCE

摘要

PURPOSE: An overlay welding method by plasma powder with high abrasion or corrosion resistance is provided to extend the life span of the equipment, and to form the hard surface against wear and corrosion through plasma overlay welding with mixing chromium carbide powder and nickel-chrome alloy powder at the rate of 75 to 25. CONSTITUTION: Chromium carbide powder and nickel-chrome alloy powder are mixed at the rate of 75 to 25, and plasma overlay welding is performed with using the mixture to form the hard-faced surface against wear and corrosion. The hard-faced layer is composed of carbide and nickel-chrome alloy with the maximum Vickers micro-hardness of 1286, and combined with base metal. The dilution of the hard-faced layer is less than 20%. Abrasion resistance and corrosion resistance are improved with manufacturing the hard-faced layer through plasma overlay welding.