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:
Jan. 13, 2009
Filed:
Jun. 28, 2005
Venkatasubramanian Ananthanarayanan, Beavercreek, OH (US);
Andrzej Marian Pawlak, Rochester Hills, MI (US);
James M. Payne, Lennon, MI (US);
Deepak K. Sharma, Troy, MI (US);
Kenneth E Johnson, South Lyon, MI (US);
Venkatasubramanian Ananthanarayanan, Beavercreek, OH (US);
Andrzej Marian Pawlak, Rochester Hills, MI (US);
James M. Payne, Lennon, MI (US);
Deepak K. Sharma, Troy, MI (US);
Kenneth E Johnson, South Lyon, MI (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
Welding apparatus includes a first electrode having an electrode surface adapted to contact an outward end fold of a heat-exchanger tube which is positioned in an orifice of a tubesheet with the fold contacting an outward-facing side of the tubesheet. A second electrode has an electrode surface adapted to contact the outward-facing side of the tubesheet. Another welding apparatus includes a first electrode having an electrode surface adapted to contact an end of a heat exchanger tube positioned in an orifice of a tubesheet. The first electrode is movable to create an outward end fold in the tube and deform the fold against the outward-facing side of the tubesheet. Another welding apparatus includes a second electrode having an electrode surface adapted to contact the outward-facing side of a tubesheet and having cutouts which surround each of a plurality of heat-exchanger tubes and which are adapted to receive a first electrode.