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Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK
Laser metal deposition as repair technology for a gas turbine burner made of Inconel 718
Fraunhofer-Gesellschaft
2016
,
Petrat, Torsten
,
Graf, Benjamin
,
Gumenyuk, Andrey
,
Rethmeier, Michael
Maintenance, repair and overhaul of components are of increasing interest for parts of high complexity and expensive manufacturing costs. In this paper a production process for laser metal deposition is presented, and used to repair a gas turbine burner of Inconel 718. Different parameters for defined track geometries were determined to attain a near net shape deposition with consistent build-up rate for changing wall thicknesses over the manufacturing process. Spot diameter, powder feed rate, welding velocity and laser power were changed as main parameters for a different track size. An optimal overlap rate for a constant layer height was used to calculate the best track size for a fitting layer width similar to the part dimension. Deviations in width and height over the whole build-up process were detected and customized build-up strategies for the 3D sequences were designed. The results show the possibility of a near net shape repair by using different track geometries with laser metal deposition.