| Title | Weld Repair of Geothermal Turbine Rotors |
|---|---|
| Authors | Chaney, Craig E. |
| Year | 1989 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Power Generation; USA; Sonoma; The Geysers; Corrosion; Erosion; Dissimular Metal Rotors; Metalurgy; Stress Corrosion Cracking; Shot Peening; Heat Affected Zone |
| Abstract | In the past ten years PG&E has been experiencing stress corrosion cracking in its geothermal turbine rotors at an increasing rate. The Geysers Turbine Rotor Restoration Project was formed to developed cost effective alternatives to replacing damaged rotors. One of the primary alternatives evaluated by this project has been the weld repair of turbine rotors. This paper describes some of the unique metallurgical requirements that were considered when a 55 MW turbine rotor was weld repaired for the power plant. It also points out how turbine rotor welding technology may be exploited in the future to fabricate dissimilar metal rotors that will have superior resistance to stress corrosion cracking and general erosion/corrosion damage. |