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:
Dec. 05, 2017
Filed:
Sep. 29, 2014
Jfe Steel Corporation, Tokyo, JP;
JFE Steel Corporation, , JP;
Abstract
A friction stir welding method for welding steel sheets together includes a heating device disposed ahead of a rotating tool in an advancing direction that preheats an unwelded portion before the welding thereof by the rotating tool and at the time of preheating, the surface temperature distribution in a direction perpendicular to the advancing direction in a position at which the welding by the rotating tool is initiated is set such that given that Tis the Acpoint of a steel sheet, the maximum temperature (T) thereof is 0.6×T<T<1.8×T, and given that L is the width of the heating region exceeding a temperature (T)=0.6×T, 0.3×d≦L≦2.0×d is satisfied with a diameter (d) of the shoulder.