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:
Feb. 11, 1992
Filed:
Jan. 26, 1990
Robert W Fawley, San Diego, CA (US);
R G Keetley, San Diego, CA (US);
William D Treece, LaMesa, CA (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
Combustors of gas turbine engines in which components are brazed to the combustor are not easily repairable by conventional welding because the brazed joint includes a melting point depressant which may not only cause the joint to be brittle but also the melting point of the joint to be near or below the temperatures required for welding. These problems are solved by a relatively simple and inexpensive process for producing a weld repairable combustor which includes using a brazing powder mix comprising a metal powder compatible with the metals of the combustor and the article to be brazed to the combustor, and suitable melting point depressant in powder form, heating the brazing powder mix to a first temperature sufficient to cause the brazing powder mix to become molten, and finally heating the brazing powder mix at a second temperature for a sufficient time to cause the melting point depressant to substantially diffuse away from the brazed area. The resulting combustor formed by this process can be repaired by welding when cracks or other discontinuities requiring a weld repair are situated near or at the brazed joint, and this process avoids the expensive requirement of redesign of the combustor to a welded combustor configuration which would require major tooling, equipment and processing changes.