Method of repairing or modifying turbine blades

Details Method of repairing or modifying turbine blades Method of repairing or modifying turbine blades

1990-03-21

1992-03-03

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 115Q, 2940218, 2940221, C21D 800

Patent

active

050929429

ABSTRACT:
A method of repairing or modifying a turbine blade wherein damage or erosion has occurred to the end part of a turbine blade or it is required to remove the end part so as to improve the efficiency of the blade as a whole comprises the steps of removing the damaged end part or a part requiring replacement, securing a new piece of material to the blade which may or may not be partly preformed, and after securing of the new piece of material to the blade and heat treatment processes, subsequently working the new piece of material so that it conforms to the desired shape. The working of the new piece of material only after securement and heat treatment ensures that discontinuities such as lacing wire holes, shroud band apertures, tenons etc., are not left with concentrations of inbuilt stress due to the welding or heat treatment operations and if required the new part may be oversize material which ensures that if slight misalignment occurs between the blade and the new piece of material there is sufficient materia to enable the part to be worked to the correct shape.

REFERENCES:
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patent: 2632944 (1953-03-01), Kittelson
patent: 3449816 (1969-06-01), Swick et al.
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patent: 3660882 (1972-05-01), Widowitz et al.
patent: 4028787 (1977-06-01), Cretella et al.
patent: 4866828 (1989-09-01), Fraser
patent: 4896408 (1990-01-01), Fraser
patent: 4953776 (1990-09-01), Fraser
Oates, J. A. Modern Welding Practice, vol. II, Caxton Publishing Co., London TT 21103 1958, pp. 298, 299.

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