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:
May. 06, 2003
Filed:
Feb. 26, 2001
Hitachi, Ltd., Tokyo, JP;
Abstract
End portions of members are abutted against each other. A trapezoidal convex portion of the member is inserted into a trapezoidal concave portion of the member . A friction stir welding is performed by inserting a rotary tool from the side of raised portions . A small-diameter portion of the rotary tool is tapered and is provided with a screw thread . A large-diameter portion is of a member different from an axis portion of the rotary tool and is connected thereto by a pin . The screw thread of the screw thread portion could be formed in the vicinity of a concave surface of an end surface of the large-diameter portion , so that stirring near the end surface can be performed sufficiently. Therefore, good friction stir welding can be achieved.
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