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Laser Welded Joint And Method For Producing Laser Welded Joint

Abstract: Provided is a laser welded joint (1) and a method for producing the same, the laser welded joint (1) comprising a plurality of steel sheets (11) and (12) and a weld metal (20) for joining the plurality of steel sheets (11) and (12), characterized in that: at least one of the plurality of steel sheets (11) and (12) is a high-strength steel sheet having a Vickers hardness of 320 HV or higher; the plurality of steel sheets (11) and (12) have a content of Al penetrated into the base metal that is higher than 0.10 mass% but not higher than 2.10 mass%; the weld metal (20) has an average Al content of 0.30-2.00 mass%; when the average Al content, average Si content, and average Mn content of the weld metal (20) are expressed by [Al], [Si], and [Mn], respectively, relationship 1 ([Al]/([Al]+[Si]+[Mn])=0.150) is satisfied; and Al-containing slag covers 30.0% or more of the surface of the weld metal (20).

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Patent Information

Application #
Filing Date
09 July 2025
Publication Number
31/2025
Publication Type
INA
Invention Field
MECHANICAL ENGINEERING
Status
Email
Parent Application

Applicants

NIPPON STEEL CORPORATION
6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071

Inventors

1. ASHIDA Hajime
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071
2. FUJIMOTO Hiroki
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071

Specification

Documents

Application Documents

# Name Date
1 202517065513-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [09-07-2025(online)].pdf 2025-07-09
2 202517065513-STATEMENT OF UNDERTAKING (FORM 3) [09-07-2025(online)].pdf 2025-07-09
3 202517065513-REQUEST FOR EXAMINATION (FORM-18) [09-07-2025(online)].pdf 2025-07-09
4 202517065513-PROOF OF RIGHT [09-07-2025(online)].pdf 2025-07-09
5 202517065513-PRIORITY DOCUMENTS [09-07-2025(online)].pdf 2025-07-09
6 202517065513-POWER OF AUTHORITY [09-07-2025(online)].pdf 2025-07-09
7 202517065513-FORM 18 [09-07-2025(online)].pdf 2025-07-09
8 202517065513-FORM 1 [09-07-2025(online)].pdf 2025-07-09
9 202517065513-DRAWINGS [09-07-2025(online)].pdf 2025-07-09
10 202517065513-DECLARATION OF INVENTORSHIP (FORM 5) [09-07-2025(online)].pdf 2025-07-09
11 202517065513-COMPLETE SPECIFICATION [09-07-2025(online)].pdf 2025-07-09