Method of refurbishing cast gas turbine engine components and refurbished component

Patent 4878953 Issued on November 7, 1989. Estimated Expiration Date:

January 13, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Method of refurbishing turbine vanes and the like
Patent #: 4050133
Issued on: 09/27/1977
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Superalloy article cleaning and repair method
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Inventors

Assignee

Metallurgical Industries, Inc.

Application

No. 143513 filed on 01/13/1988

US Classes:

148/512, Surface melting (e.g., melt alloying, etc.)29/889.1, Repairing or disassembling148/903, Directly treated with high energy electromagnetic waves or particles (e.g., laser, electron beam)228/119Repairing, restoring, or renewing product for reuse

Examiners

Primary: Kastler, S.

Attorney, Agent or Firm

Kenyon & Kenyon

International Class

C21D 001/09

Abstract

The refurbishing process permits an overlay to be formed on a casting to repair cracks, distortions and the like as well as to build up undersized sections. During refurbishing, a plasma arc is established under an electric current of less than 30 amps to form a shallow pool of molten metal on a casting. Powdered metal is delivered slightly above the molten pool and, subsequently, the melted powder and molten pool solidify to an overlay having a high integrity, cast structure which is metallurgically bonded to the casting with minimal dilution.