TURBINE BLADE TIP RAIL FORMATION

Methods of forming or repairing a tip rail (150) of a turbine (106) are disclosed. One method may include repairing the tip rail (150), or adding material to form the tip rail (150), by laser (254) irradiating a wire material (252) with a laser (254) in an inert gas (262) in a vicinity of a tip plat...

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Bibliographic Details
Main Authors WASSMER, Klaus-Dieter, MANGANO, Fabrizio, CAFARELLI, David, LUCKE, Norbert, BISSIG, Hans
Format Patent
LanguageEnglish
French
German
Published 11.09.2019
Subjects
COMBINED OPERATIONS
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
OTHER WORKING OF METAL
PERFORMING OPERATIONS
TRANSPORTING
UNIVERSAL MACHINE TOOLS
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Summary:Methods of forming or repairing a tip rail (150) of a turbine (106) are disclosed. One method may include repairing the tip rail (150), or adding material to form the tip rail (150), by laser (254) irradiating a wire material (252) with a laser (254) in an inert gas (262) in a vicinity of a tip plate (148). The laser (254) irradiating the wire material (252) includes modulated pulsing the laser (254) through: a warm up phase during which an on-power of the laser (254) is increased over time to a maximum target on-power, a melt and bond phase during which the wire material (252) is melted and during which the on-power is less than the maximum target on-power, and a stress releasing phase during which the on-power of the laser (254) is less than the on-power during the melt and bond phase. Exterior surface coatings (220) and/or TBC (222) may be sprayed onto the tip rail (150) to protect it.
Bibliography:Application Number: EP20190161139