LASER WELDED JOINT AND LASER WELDING METHOD - NIPPON STEEL & SUMITOMO METAL CORP

Title:

LASER WELDED JOINT AND LASER WELDING METHOD

Document Type and Number:

WIPO Patent Application WO/2016/043278

Kind Code:

A1

Abstract:

　The purpose of the present invention is to provide: a laser welded joint having exceptional joint strength, in which annular welding beads are prevented from cracking during lap laser welding of a steel plate in which the beads are formed in multiple layers, said joint comprising welding beads solely in the quantity necessary for joint strength; and to provide a laser welding method. The present invention is a laser welded joint having exceptional joint strength, in which annular welding beads are prevented from cracking during lap laser welding of a steel plate in which the beads are formed in multiple layers, said joint comprising welding beads solely in the quantity necessary for joint strength, wherein the laser welded joint is characterized in being manufactured by a method provided with a step for stacking a plurality of metal plates and forming a first welding bead by laser irradiation, and a step for sequentially forming two or more welding beads by laser irradiation on the outside of the first welding beads, the surface hardness of the welding beads increasing from the inside beads to the outside beads.

Inventors:

NAITO YASUAKI (JP)
MIYAZAKI YASUNOBU (JP)

Application Number:

PCT/JP2015/076528

Publication Date:

March 24, 2016

Filing Date:

September 17, 2015

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

B23K26/28; B23K26/21

Domestic Patent References:

WO2012050097A1

2012-04-19

Foreign References:

JP2012240086A	2012-12-10
CN103769746A	2014-05-07

Other References: