LASER WELDED JOINT AUTOMOTIVE PART METHOD FOR PRODUCING LASER WELDED JOINT AND METHOD FOR MANUFACTURING AUTOMOTIVE PART

摘要

This laser-welded joint is a laser-welded joint having a weld metal formed between a plurality of steel plates, wherein the chemical composition of the weld metal has a predetermined component and the average hardness of the weld metal is 350 to 540 in terms of Vickers hardness , The distribution density of the porosity of 2 占 퐉 to 50 占 퐉 in diameter is 5.0 pieces / mm2 or less in the weld metal, and the distribution density of oxide inclusions of 3 占 퐉 or more in diameter in the weld metal is 0.1 to 8.0 pieces / mm2.