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龚嘴电站装机七台,单机容量11万仟瓦,水轮机为混流式,转轮为HC702—550型。因受运输条件限制,转轮在厂家分瓣制造,运到安装现场再组成整体。上冠以螺栓把合,下环用焊接方式组合。由于部分转轮采用的新钢种15MnMoVCu铸钢存在一些问题,加之焊接工艺不当,同种材质的1~#、3~#转轮在焊后热处理过程中都产生了裂缝。裂缝的部位均在焊缝的热影响区及附
Gongzui station installed capacity of seven units, single capacity of 110,000 kilowatts, turbine for Francis, runner HC702-550 type. Due to transport constraints, runner manufacturers in the manufacture of points, shipped to the installation site and then formed the whole. On the crown to the bolt, under the ring with a combination of welding. As some of the new steel used in the runner 15MnMoVCu cast steel there are some problems, coupled with improper welding process, the same material 1 #, 3 ~ # runner in the post-weld heat treatment process have cracks. Cracks in the weld heat affected zone and attached