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:
Sep. 23, 2003
Filed:
Feb. 26, 2001
Masakuni Ezumi, Kudamatsu, JP;
Kazushige Fukuyori, Kudamatsu, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A face plate is butted against a frame , from which a segment for overlapping with the rear surface of a face plate is projected. The frame includes a raised portion . A friction stir welding is performed by inserting a rotary tool into the raised portion . The rotary tool is rotated clockwise as seen from the large-diameter portion , so that the pressure of fluidized metal is higher at the right-hand side of the axial center of the rotary tool . There exists the overlapping surface of the face plate and the projecting segment at the side with high pressure of metal. The raised portion exists at the left-hand side of the axial center of the rotary tool . Thus, the occurrence of continuous metal oxide or a notch at the overlapping surface can be restrained.