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. 14, 2001
Filed:
May. 17, 2000
Hitachi, Ltd., Tokyo, JP;
Abstract
Rotary tools,A and,B are disposed to weld along two joining lines. For this purpose spaced welding lines the two rotary tools are inserted and into respective welding joints moved at the same time along their respective welding lines. At a position P1 of a portion of a window,, the rotary tool,A is retreated from the welding joint so that the tool,A continues to move friction stir welding on that welding joint is stopped although the welding. At a position P3, the rotary tools,B are gradually withdrawn from their respective welding joints while they continue to move along the welding line. At a position P4, the moves of the rotary tools,A and,B is stopped, the rotary tool,B is made to retreat and the joining is made to stop. Next, the rotary tools,A and,B are inserted and the move are started again. An insertion amount of the rotary tool,B is larger than an insertion amount during the stop of the move of the rotary tool. In a case where plural line joining lines are carried out the friction stir joining and in a case of a portion which is unnecessary to carry out the friction stir joining, the good friction stir joining can be obtained.