Turbine blade repair
First Claim
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1. A method of repairing a turbine blade, said method comprising the steps of:
- (a) applying heating means to selected areas of a turbine blade to be repaired;
(b) heating said areas of the turbine blade to desired temperatures;
(c) carrying out a repair step on said blade, said repair step involving the application of substantial thermal energy to the blade;
(d) controlling said heating means during said repair step so as to heat said selected areas in a manner to reduce forces acting upon the blade due to the occurrence of thermal expansion in the blade resulting from application of said substantial thermal energy;
(e) said heating means being positioned so that the heat transferred to the turbine blade tends to cause distortion of said blade in a direction substantially opposite to the distortion which is likely to be caused by the repair step involving the application of said substantial thermal energy;
(f) controlling said heating means after said repair step so as to maintain said turbine blade at a predetermined temperature for a predetermined length of time.
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Abstract
A method of repairing turbine blades including a repair step which involves the application of substantial thermal energy to the blade such as a welding or brazing operation includes a pre-heating step in which the blade is heated to a predetermined temperature in a controlled manner. The controlled heating may be continued both during the repair step involving the application of substantial thermal energy and after the repair step in order to minimize stress in the blade due to the application of considerable thermal energy to the blade.
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Citations
12 Claims
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1. A method of repairing a turbine blade, said method comprising the steps of:
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(a) applying heating means to selected areas of a turbine blade to be repaired; (b) heating said areas of the turbine blade to desired temperatures; (c) carrying out a repair step on said blade, said repair step involving the application of substantial thermal energy to the blade; (d) controlling said heating means during said repair step so as to heat said selected areas in a manner to reduce forces acting upon the blade due to the occurrence of thermal expansion in the blade resulting from application of said substantial thermal energy; (e) said heating means being positioned so that the heat transferred to the turbine blade tends to cause distortion of said blade in a direction substantially opposite to the distortion which is likely to be caused by the repair step involving the application of said substantial thermal energy; (f) controlling said heating means after said repair step so as to maintain said turbine blade at a predetermined temperature for a predetermined length of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification