MANUFACTURE OF FERROUS SINTERED PARTS

摘要

PURPOSE:To provide a method where no defective welds are found and the strength of a joint as strong as that of the base metal is obtained in sintered parts welded by the laser welding. CONSTITUTION:In manufacturing the jointed parts of ferrous sintered parts or of sintered parts and the steel, the welding is executed by the laser welding method, and the post weld heat treatment is executed on the jointed parts. The strength of the joint as strong as that of the base metal of the sintered parts can be obtained by the post weld heat treatment. The jointed parts of the sintered parts where the corrosion resistance, the wear resistance or the airtightness is improved are obtained by executing the oxide film treatment at the temperature of 400-600 deg.C after welding combined with the post weld heat treatment. This manufacturing method is suitable for the sintered parts to be used mainly in the power transmission system or the like of an automobile.