US Patent Issued to JFE STEEL on April 14 for "Friction stir spot welded joint and production method therefor, and friction stir spot welding method" (Japanese Inventors)

ALEXANDRIA, Va., April 15 -- United States Patent no. 12,599,987, issued on April 14, was assigned to JFE STEEL Corp. (Tokyo).

"Friction stir spot welded joint and production method therefor, and friction stir spot welding method" was invented by Daiki Yamagishi (Tokyo), Katsutoshi Takashima (Tokyo), Hiroshi Matsuda (Tokyo), Ryoji Ohashi (Kobe, Japan), Yoshitaka Muramatsu (Kobe, Japan) and Takuya Fukuda (Kobe, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a friction stir spot welded joint having high joint strength even in the case where a high strength steel sheet, particularly a steel sheet with a tensile strength (TS) of 980 MPa or more, is used as a material to be welded. An annular gr...