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Method for controlling brazing

United States Patent

August 1, 2006
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A method for making a braze joint across a discontinuity in a work piece using alternating current. A filler metal is pre-placed at a location sufficiently close to the discontinuity such that, when an alternating current is applied across a work piece to heat the work piece and melt the filler metal, the filler metal is drawn into the discontinuity. The alternating current is maintained for a set residence time, generally less than 10 seconds and more particularly less than 3 seconds. The alternating current is then altered, generally by reducing the current and/or voltage such that the filler metal can solidify to form a braze joint of desired quality and thickness.
Hosking; F. Michael (Albuquerque, NM), Hall; Aaron C. (Albuquerque, NM), Givler; Richard C. (Albuquerque, NM), Walker; Charles A. (Albuquerque, NM)
Sandia Corporation (Albuquerque, NM)
10/ 777,666
February 10, 2004
This invention was made with Government support under Contract No. DE-AC04-94AL85000 awarded by the Department of Energy. The Government has certain rights in the invention.