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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Dikran, A. Barhanko Åberg, Niclas R. Olov, H. Andersson |
| Copyright Year | 2018 |
| Abstract | The SGT-700 gas turbine currently rated at 33 MW (simple cycle) and with an efficiency of ∼ 37% has been in service since 2002. In order to reduce life cycle cost, a repair process with an acceptable repair yield needed to be developed for turbine blade stage 1. The stage 1 blade is made from the polycrystalline cast alloy IN792, and the blade is coated with PtAl or MCrAlY+TBC depending on engine model. The blade is internally air cooled. After the row 1 vane, the stage 1 blade is forced to withstand the highest temperatures. The combination of high temperatures, and thermomechanical fatigue loading results in blade tip degradation, which leads to a loss of thermal efficiency. The blade tip repair process described in this document is one step in a continuous repair development plan for the SGT-700. To ensure quality in each reparation, the blade tip repair described here was developed using Siemens’ Product Development Process (PDP). The development of the repair procedure include: • Coating removal • Pre- and post-weld heat treatment • Machining of oxidized areas • Hot box welding with manual GTAW • Grinding to final air foil shape • Re-opening of the cooling holes with EDM • EDM to restore the squealer tip • Recoating and air flow check This technical paper describes the repair process developed together with a sub-supplier. The project resulted in a successful repair process for the component as well as repaired blades with higher blade tip oxidation resistance compared with the original design. |
| Sponsorship | International Gas Turbine Institute |
| File Format | |
| ISBN | 9780791851128 |
| DOI | 10.1115/GT2018-75696 |
| Volume Number | Volume 6: Ceramics; Controls, Diagnostics, and Instrumentation; Education; Manufacturing Materials and Metallurgy |
| Conference Proceedings | ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition |
| Language | English |
| Publisher Date | 2018-06-11 |
| Publisher Place | Oslo, Norway |
| Access Restriction | Subscribed |
| Subject Keyword | Cycles Temperature Blades Welding Machining High temperature Coatings Grinding Engines Thermomechanics Design Gas turbines Oxidation Coating processes Shapes Life cycle costing Turbine blades Cooling Alloys Fatigue Gas tungsten arc welding Maintenance Electrical discharge machining Air flow Product development Thermal efficiency Heat treating (metalworking) |
| Content Type | Text |
| Resource Type | Article |
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