Method of repairing shroud tip overlap on turbine buckets
US6701616B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2002 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Jul 7, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49746
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Shroud covers 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 of high hardness material is applied along the radial inside surface of the overlapping cover and adjacent an intermediate edge of the Z-shaped edges of the covers. Additional weld beads 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.