Method for Manufacturing Stay Vane Module of Large Francis Turbine

摘要

The present invention relates to a method for manufacturing a stay vane module of a large Francis turbine, capable of remarkably reducing the loss of flowrate passing a stay vane. According to the present invention, the method for manufacturing a stay vane module of a large Francis turbine includes: a step (a) of manufacturing an upper stay vane module (210) having an upper stay ring (230) and multiple upper stay vanes (240) integrally formed without a bonding unit on the lower surface of the upper stay ring (230); a step (b) of manufacturing a lower stay vane module (220) in which a lower stay ring (250) and multiple lower stay vanes (260) are integrally formed without the bonding unit; a stay vane module welding step (c) of welding the upper and lower stay vanes (240, 260) after arranging the upper and lower stay vane modules (210, 220) so that a first connection unit (241) formed at a lower end of each upper stay vane (240) and a second connection unit (261) formed at an upper end of each lower stay vane (260) are in contact; and a polishing step (d) of polishing a welding unit.