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:
Jun. 05, 2007
Filed:
Dec. 10, 2004
Yen-lung Chen, Troy, MI (US);
Thomas Arthur Perry, Bruce Township, MI (US);
Yang-tse Cheng, Rochester Hills, MI (US);
Anita M. Weiner, West Bloomfield, MI (US);
Yen-Lung Chen, Troy, MI (US);
Thomas Arthur Perry, Bruce Township, MI (US);
Yang-Tse Cheng, Rochester Hills, MI (US);
Anita M. Weiner, West Bloomfield, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A surface of an article is heated and subjected to pressure by operation of a friction stir tool. The pressure of the face of the tool on the article surface, and the speed of rotation of the tool and of its progression along the surface of the article, are controlled to progressively hot-work a specified surface area. The face of the tool may be round and have a profiled, axially extending, smaller diameter pin for higher concentration of frictional heat and load and for plasticizing a surface layer of the workpiece. Such hot work may be applied for reducing surface porosity or for producing another change in the surface microstructure, or for effecting another change in surface material properties.