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:
Feb. 08, 2022
Filed:
Mar. 22, 2017
Jfe Steel Corporation, Tokyo, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
An object is to provide a friction stir welding method and apparatus that provide sufficient strength and good welding workability by advantageously eliminating plastic flow deficiency generated as a result of insufficient heating of workpieces. In friction stir welding for steel sheets () as workpieces, a pair of facing rotary tools () are inserted into a non-welded part from both one surface side and the other surface side of the steel sheets (), the rotary tools move in a welding direction while rotating, and in addition, a preheating process for heating steel sheets () is performed by heating means () provided in front of the rotary tools (). The configuration of the pair of facing rotary tools () and the surface temperature, area, position, and so forth of a heated region in the preheating process are strictly controlled.