Blade Platform Repair and Redesign (01-Oct-2009)
A tip repair method for gas turbine engine blade platforms. The method, applicable to extensively damaged platforms, provides an alternative to the replacement of a damaged blade platform with a new blade platform. The method involves rebuilding damaged portions of the platform and includes the closing of some cooling channels and the forming of other additional cooling channels. The additional channels enable improved cooling of the platform and thus the service life of the platform may be extended beyond that of the original platform.
Blade Platform Repair/Redesign
Base material: Nickel base superalloy material
Weld Filler: Nickel base weld filler or material similar to base metal
Background: Turbine Blade suffers from extensive damage at the platform during high temperature turbine operation. The following are the damages and not limited to:
· Oxidation
· TMF cracks
· LCF cracks
· Foreign object damage
These damages are being repaired during reconditioning to restore the lifetime of the component or increase the platform performance for it to be able to perform another cycle rather than replacing it with a new blade thus being a cost effective solution for the turbine operator.
This document describes the damages seen on the blade platform, steps and methods to repair these damages, implementation of cooling configuration and the design of the new platform feature.
State of the art:
The damages were weld repaired. The blade is Fluoride Ion Cleaned (FIC) to remove oxides inside cracks also to ensure proper braze repair. Crack brazing is done to repair remaining cracks. However, the holes shall be clear from braze material by inserting ceramic pin into the holes thus the original cooling configuration remains.
Repair Method:
The blade coating shall be stripped and then heat-treated to improve weld ability of the base material. The damages and cracks shall then be removed by automated or manu...
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