Abstract: The present invention relates to a method for repairing a wide crack in a hot gas path part for a gas turbine using brazing, the method including the steps of removing oxides from the inside of the wide crack of the hot gas path part, filling base metal powder and a filler into the wide crack from which the oxides have been removed, and bonding the wide crack by means of the br

Abstract: The present invention relates to a method for repairing a tooth of a labyrinth seal using 3D printing, the labyrinth seal consisting of an arch-shaped body and teeth protruding from the inner surface as one surface of the arch-shaped body, the method including the steps of: removing a damaged tooth from the body of the labyrinth seal; depositing a tooth onto the body by means of the 3D printing; and adjusting the surface roughness of the deposited tooth by means of machining.

Abstract: The present invention relates to a method for manufacturing a labyrinth seal using wire arc additive manufacturing, which is mounted between a diaphragm of a turbine and a turbine rotor to induce a smooth rotation of the turbine rotor and preventing gas leakage by minimizing friction between the diaphragm of a turbine and a turbine rotor when a rotating body such as the turbine rotor rotates inside a fixed body such as the diaphragm, and which includes a ring-shaped body part and a tooth part protruding on one side of the ring-shaped body part, wherein the labyrinth seal is deposition-manufactured by 3D printing, the body part is manufactured by the wire arc additive manufacturing, and the tooth part is manufactured by a directed energy deposition.

Abstract: The present invention relates to a method for manufacturing a labyrinth seal using wire arc additive manufacturing, which is mounted between a diaphragm of a turbine and a turbine rotor to induce a smooth rotation of the turbine rotor and preventing gas leakage by minimizing friction between the diaphragm of a turbine and a turbine rotor when a rotating body such as the turbine rotor rotates inside a fixed body such as the diaphragm, and which includes a ring-shaped body part and a tooth part protruding on one side of the ring-shaped body part, wherein the labyrinth seal is deposition-manufactured by 3D printing, the body part is manufactured by the wire arc additive manufacturing, and the tooth part is manufactured by a directed energy deposition.

Abstract: The present invention relates to a method for manufacturing a gas turbine rotor heat shielding segment, which is mounted on a rotor outer wall between a compressor and a turbine and shields the leakage of heat and gas so that gas of high-temperature and high-pressure is not transferred from a burner of a gas turbine to a rotor shaft during the operation of the gas turbine, and more specifically, to a method for manufacturing a gas turbine rotor heat shielding segment by three-dimensional printing, wherein a portion having a simplified shape is manufactured by casting, and a portion having a complex shape is manufactured by 3D printing.

Abstract: The present invention relates to a method for manufacturing a labyrinth seal for a turbine through the additive manufacturing of martensitic stainless steel using 3D printing, the method including the steps of: making a ring-shaped body of the labyrinth seal by means of centrifugal casting or a ring mill and a labyrinth part protruding from one surface of the ring-shaped body of the labyrinth seal by means of the 3D printing; and depositing a bonding layer onto top of the ring-shaped body to improve a bonding force between the ring-shaped body and the labyrinth part, the bonding layer having a composition similar to the composition of the metal powder or metal wire used in the 3D printing.

Abstract: A method of manufacturing a labyrinth sealing device mounted between a diaphragm and a turbine rotor of a turbine to induce smooth rotation of the turbine rotor and prevent a leakage of gas by minimizing friction is presented. A labyrinth sealing device includes a ring-shaped body and a labyrinth part protruding from one surface of the ring-shaped body. The ring-shaped body is manufactured by centrifugal casting or ring mill, and the labyrinth part is manufactured by 3D printing.