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某电厂1号机组系我厂生产的N_(70)—90—1型汽轮机,一九七九年和一九八一年进行大修时,先后发现20、21级叶轮外包小脚裂纹多处。叶轮为外包双T型叶根,如图1
Unit 1 of a power plant was a type N_ (70) -90-1 turbine produced by our factory. When overhauling in 1979 and 1981, it was found that there were many cracks in the 20 and 21 levels of impeller outsourcing. Impeller outsourcing double T-shaped root, shown in Figure 1