A method for repairing shroud tip overlap on turbine buckets

摘要

Shroud covers (14) for buckets of gas turbines sometimes overlap one another. To repair a shroud cover overlap and preclude further overlap during turbine operation, a first weld bead (38) of high hardness material is applied along the radial inside surface (28) of the overlapping cover and adjacent an intermediate edge of the Z-shaped edges of the covers. Additional weld beads (40, 42) of a more ductile material are applied along the same surface behind the initial weld bead to structurally support the high hardness initially applied weld material. By building up weld material along the inside radial face of the overlapping cover adjacent the overlapped edge of the adjoining cover, the thickness of the overlapping cover is increased to preclude shroud cover overlap during further turbine operation.