The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 2020
Filed:
Jan. 30, 2015
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Fuminori Watanabe, Tokyo, JP;
Yasunobu Miyazaki, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
The present invention has as its object to provide a spot welded joint and spot welding method which raise the fracture toughness of spot welded metal to raise the strength of the spot welded joint. In the present invention, there is provided a spot welding method comprising a melt zone forming step forming a melt zone by conduction and, after the melt zone forming step, a solidification step of running a current lower than the current run in the melt zone forming step so as to cause the melt zone to solidify, wherein, in the solidification step, electromagnetic vibration is applied to the melt zone, and a frequency fof the electromagnetic vibration, a solidification speed νwhen the melt zone solidifies, and an arm interval of dendrites λwhen the melt zone solidifies satisfy 0.2≤ν/(λ·f)≤4.0.