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:
Apr. 09, 2002
Filed:
Dec. 06, 2000
Hans-Dieter Gall, Duisburg, DE;
Thyssen Krupp Stahl AG, Dusseldorf, DE;
Abstract
The invention relates to a method for welding a double layer sheet metal ( ) having an intermediate layer ( ), in particular, a sheet metal with knobs, with a bonding sheet metal ( ) by spot or roll seam welding. Before welding of the bonding sheet metal ( ) with the two cover sheet metals ( ), spaced apart by the intermediate layer ( ) of the double layer sheet metal, is carried out, the area ( ) about the welding location ( ) is burned free of the intermediate layer ( ) by the current which is introduced over a large surface area into the cover sheet metals ( ) via the welding electrodes ( ) placed thereat and guided via a shunt adjacent to the welding location ( ). Only thereafter, the sheet metals are brought into conducting contact with one another by a directed local pressure application, and the welding process is carried out.