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:
Nov. 16, 2010
Filed:
Oct. 11, 2006
Pei-chung Wang, Troy, MI (US);
Robert J. Gollehur, Macomb Township, MI (US);
Pei-Chung Wang, Troy, MI (US);
Robert J. Gollehur, Macomb Township, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A method is provided for welding a laminated metal sheet to a workpiece. The laminated metal sheet includes an outer metal sheet and an inner metal sheet bonded together by a polymer material that impedes the flow of weld current. A punch is applied against the outer metal sheet and driven through the laminated metal sheet to create a hole and also create an annular metallic burr that bridges across the polymer material layer between the outer metal sheet and the inner metal sheet. A weld electrode is positioned against the outer metal sheet at the punched hole and weld current is conducted through the first annular metallic burr to create an electric resistance weld between the laminated metal and the workpiece.