METHOD FOR REPAIRING TURBINE BLADE

摘要

PROBLEM TO BE SOLVED: To provide a repairing a crack of a turbine blade. SOLUTION: In the method, a first surface of the turbine blade 10 in a neighborhood of a trailing edge part 26 where the crack 16 is positioned is shaved and a second surface of the turbine blade 10 in the neighborhood of the trailing edge part 26 where the crack 16 exists is shaved. In each shaving, the crack 16 is removed by shaving each surface larger than a length of the crack 16 and for a depth smaller than a radius of the trailing edge part 26, and the trailing edge part 26 is formed after shaving. A composite radius is used for preventing transition to the trailing edge part 26 causing aerodynamic loss and reducing stress of a root part of an air foil part 22. The method also includes applying heat insulating coating to the turbine blade 10 for extending usable life. Before coating, a tip of the turbine blade is corrected for corresponding to change of a thermal characteristic of the turbine blade 10.