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:
Jul. 17, 2012
Filed:
Oct. 12, 2009
Cameron John Dasch, Bloomfield Hills, MI (US);
Cameron John Dasch, Bloomfield Hills, MI (US);
GM Global Technology Operations, Detroit, MI (US);
Abstract
On a friction stir spot welded workpiece having a first side including a friction stir spot weld hole and an opposing smooth second side, an eddy current probe is passed over the spot weld hole from the second side, and an eddy current signal representative of a material thickness of the workpiece is produced. The eddy current is analyzed via an eddy current analyzer, and a graphic representation of the analyzed eddy current signal is monitored as the probe passes over the spot weld hole, and a local minima of the graphic representation defined by a displayed characteristic J-shaped curve is identified, the local minima defining a remaining material thickness of the workpiece at the bottom of the spot weld hole. From the graphic representation, a value of the remaining material thickness is determined, and a weld strength of the spot weld as a function of the remaining material thickness is determined.