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:
Aug. 31, 2004
Filed:
Feb. 01, 2002
Hitachi, Ltd., Tokyo, JP;
Abstract
A rotary tool ( ) having on the end surface of a large-diameter portion ( ) facing a small-diameter portion ( ) grooves ( ) formed in arc-like shapes, and performing friction stir weld by inserting the end surface of the large-diameter portion ( ) and the small-diameter portion to members and rotating the tool ( ). By the rotation, the metal of the members moves along the grooves ( ) to the center axis direction of the rotary tool ( ). The arc-shaped grooves ( )are formed to curve toward the direction of rotation. Since the metal material of the members is moved toward the center, a good weld is realized even when only one of the members to be welded has a projection, or when a large gap is formed therebetween.