MUMBAI, India, July 25 -- Intellectual Property India has published a patent application (202517065810 A) filed by Nippon Steel Corporation, Tokyo, on July 10, for 'welded joint.'
Inventor(s) include Furukawa, Noriyuki; Mitsunobu, Takuya; Oke, Takashi; and Tsujimura, Takao.
The application for the patent was published on July 25, under issue no. 30/2025.
According to the abstract released by the Intellectual Property India: "The present invention addresses the problem of providing a welded joint in which LME cracking during the production is suppressed. A welded joint according to the present invention is characterized by comprising a high-strength steel sheet which has a tensile strength of 780 MPa or more, while having a specific chemical composition. This welded joint is also characterized in that: in a non-heat-affected zone that is at a distance of 5 mm or more from the outer edge of a spot welded part, the depth at which the C concentration as measured by GDS is 0.01% or less is 3 m or more in the depth direction of the high-strength steel sheet, and the surface roughness of the high-strength steel sheet is more than 3.0 m; and in a heat-affected zone that is at a distance of 0 m to 100 m from a welded shoulder part, the thickness of a layer which has an area ratio of cementite of 10% or less is 8 m or more in the depth direction of the high-strength steel sheet."
The patent application was internationally filed on Jan. 12, 2024, under International application No.PCT/JP2024/000631.
Disclaimer: Curated by HT Syndication.
