Method for connecting impeller cover of closed impeller with impeller

The invention belongs to the technical field of impeller machining, and particularly relates to a method for connecting an impeller cover of a closed impeller with the impeller. The method is providedfor overcoming the defect that a blind area exists in the machining process of an existing closed impeller. The method comprises the following steps that the impeller is machined in an integrated manner, the split impeller cover is machined, impeller cover petals are assembled on the impeller, and a plurality of impeller cover petals are welded together through diffusion welding. According to themethod, the impeller cover is welded in a decomposition and synthesis manner, the conventional thinking manner is broken through, and meanwhile springback deformation, thermal deformation, cracks andthe like generated by welding after direct split manufacturing are reduced. 本发明属于叶轮加工技术领域，具体为一种闭式叶轮的叶轮罩与叶轮的连接方法，是针对现有闭式叶轮在加工过程中存在"盲区"的缺陷所提出，其包括如下步骤：叶轮采用一体式加工方式、加工分体式叶轮罩、将叶轮罩瓣装配在叶轮上、通过扩散焊将多个叶轮罩瓣焊接在一起。本发明将叶轮罩采用分解再合成的焊接方式，该方法突破了常