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. 24, 2004
Filed:
Jan. 30, 2002
Hitachi, Ltd., Tokyo, JP;
Abstract
A rim member forming an entrance and a plate ( ) are friction stir welded by moving a rotary tool along the rim member . The rotary tool is tilted along the direction of movement. Welding is started at right block R, and when the tool reaches corner portion P between the right block R and a center block C, the tool is pulled out of the rim member and plate ( ). Next, the tool is tilted toward the direction of movement along center block C. Thereafter, the tool is lowered and inserted to position, and friction stir welding is restarted. According to the invention, the direction of the rotary tool is not changed while the tool is inserted to the rim member . This prevents generation of excessive friction heat, and thereby realizes a good weld.