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:
Apr. 09, 2019
Filed:
Sep. 11, 2014
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
NIPPON STEEL & SUMITOMO METAL CORPORTION, Tokyo, JP;
Abstract
An overlapped bodyincludes at least three steel platesandand in which at least one steel plate interfacehas a contact resistance different from the contact resistance of another steel plate interface. A molten pool is formed at the steel plate interfaces so as to join the steel platesand, and an energization pointis formed at the steel plate interfacehaving the largest contact resistance. Initial spot welding is performed under a condition in which a branch current is generated in the energization pointso as to form the molten pool. By doing so, it makes it difficult to generate the expulsion and surface flash at the steel plate interface where resistive heating is large and form the molten pool having a sufficiently large size at the steel plate interface where resistive heating is small.