Methods for manufacturing a nozzle box assembly for a steam turbine
US6754956B1 · kind B1 · utility
7Cited by
3References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2002 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Dec 4, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49998
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Halves of a torus, bridge ring and nozzle are fitted up on tapered fits and clamped one to the other. Weld preps are performed on the torus and nozzle surfaces to be welded. Weld material is applied along the inner and outer radii, initially in a root pass to consume the metal, in subsequent intermediate passes to build up the base metal and finally in a rapid deposition of weld material, e.g., using submerged arc process. The nozzle box assembly half is then stress-relieved, X-rayed and machine-finished.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.