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Method for laser welding a fin and a tube

United States Patent

October 9, 2001
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A method of laser welding a planar metal surface to a cylindrical metal surface is provided, first placing a planar metal surface into approximate contact with a cylindrical metal surface to form a juncture area to be welded, the planar metal surface and cylindrical metal surface thereby forming an acute angle of contact. A laser beam, produced, for example, by a Nd:YAG pulsed laser, is focused through the acute angle of contact at the juncture area to be welded, with the laser beam heating the juncture area to a welding temperature to cause welding to occur between the planar metal surface and the cylindrical metal surface. Both the planar metal surface and cylindrical metal surface are made from a reflective metal, including copper, copper alloys, stainless steel alloys, aluminum, and aluminum alloys.
Fuerschbach; Phillip W. (Tijeras, NM), Mahoney; A. Roderick (Albuquerque, NM), Milewski; John O (Santa Fe, NM)
Sandia Corporation (Albuquerque, NM)
09/ 535,070
March 23, 2000
This invention was made with Government support under Contract No. DEAC04-94AL85000 awarded by the Department of Energy. The Government has certain rights in the invention.