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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.:

US 10005151 B1

PDFFull Text
Date of Patent:
Jun. 26, 2018

Filed:

Sep. 29, 2014

Friction stir welding method for steel sheets and method of manufacturing joint

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Koichi Taniguchi, Tokyo, JP;

Muneo Matsushita, Tokyo, JP;

Rinsei Ikeda, Tokyo, JP;

Assignee:

JFE Steel Corporation, , JP;

Attorney:

DLA Piper LLP (US)

Primary Examiner:

Kiley Stoner

Int. Cl.
CPC ...
B23K 20/12 (2006.01); B23K 20/227 (2006.01); C21D 9/50 (2006.01); C21D 1/42 (2006.01); B23K 20/22 (2006.01); B23K 20/24 (2006.01); B23K 20/26 (2006.01); B23K 31/02 (2006.01); B23K 101/18 (2006.01); B23K 103/04 (2006.01);
U.S. Cl.
CPC ...
B23K 20/122 (2013.01); B23K 20/1235 (2013.01); B23K 20/22 (2013.01); B23K 20/227 (2013.01); B23K 20/24 (2013.01); B23K 20/26 (2013.01); B23K 31/02 (2013.01); C21D 1/42 (2013.01); C21D 9/50 (2013.01); B23K 2201/18 (2013.01); B23K 2203/04 (2013.01); B23K 2203/05 (2015.10); Y02P 10/253 (2015.11);
Abstract

A friction stir welding method for steel sheets includes inserting a rotating tool into an unwelded portion where two or more steel sheets are overlapped or butted together; moving the rotating tool along portions to be welded while rotating the tool so that a softened portion is formed in the steel sheets by friction heat generated between the rotating tool and the steel sheets, and the steel sheets are welded together by utilizing a plastic flow generated by the softened portion being stirred; and preheating the unwelded portion before welding by the rotating tool by a pair of heating devices disposed over and under the unwelded portion and ahead of the rotating tool in the advancing direction to enable high speed welding without the risk of generation of welding defects and damage to the welding tool.

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