WELD OVERLAPPING JOINT AND MANUFACTURE THEREOF

摘要

PROBLEM TO BE SOLVED: To prevent a cracking at a laser fused joint part. SOLUTION: This is referred to a method to manufacture a weld overlapping joint constituted with a flange part 2 of a magnetic material which comprises a chin part 21, and a neck part 22 and having an insertion hole 23 installed inside of the two parts and opened at least at an end part of the neck part, and a shaft part 3 which is made of an abrasion-proof metallic material and inserted into the insertion hole. A fused part 1 is formed by laser welding the flange part and the shaft part by irradiating an outer periphery part of the neck part with the laser after inserting the shaft part into the insertion hole. A dilution rate (B/(A+B)) to be constituted by an magnetic material A of the flange part and the abrasion-proof metallic material B at the fused part generated by the laser welding is preferable to be 15-45%.