导言随着我国水电建设事业的飞跃发展,单机容量日益增大。水力发电机组所需的毛坯也就越来越大。这些大型毛坯如采用整铸,则往往由于冶铸能力、进度与质量等因素限制,不能满足生产需要。其中尤以大型混流式水轮机转轮最为突出。该转轮不仅重量,体积大,而且形状复杂,线形尺寸要求也严格。唯有改为分铸拚焊结构,才能使上述问题迎刃而解。因此, Introduction With the rapid development of hydropower construction in our country, the stand-alone capacity is increasing day by day. The horsepower required for hydroelectric power plants is also growing. Such as the use of large castings such as casting, it is often due to the ability to smelter, progress and quality constraints and other factors, can not meet the production needs. Among them, the large Francis turbine is the most prominent. The wheel is not only heavy, bulky, and complex shape, linear size requirements are also strict. Only to cast cast welded structure, in order to solve the above problems solved. therefore,