本文以流滩坝电站灯泡式贯流机组(下称灯泡机组)为实例,对灯泡式机组结构件焊接特殊性进行分析。灯泡机组的结构件中,焊接结构所占比重高于立式水电机组;单位容量的结构尺寸大,构件刚度相对较弱;对结构件的尺寸和焊缝致密性便提出了较高的要求。在焊接结构设计和制造过程中必须从质量和效率两个角度予以认真研究。 In this paper, Liu Tanba Hydropower Bulb-type turbine unit (hereinafter referred to as the bulb unit) as an example, the structural characteristics of the bulb-type welding unit analysis. Bulb unit structure, the proportion of welding structure is higher than the vertical hydropower unit; unit capacity of the structure size is large, the rigidity of the member is relatively weak; the structure of the size and tightness of the weld put forward higher requirements. In the welding structure design and manufacturing process must be carefully studied both from the perspective of quality and efficiency.