风力发电机转子为合金钢42CrMo和Q235B异种钢焊接结构,采用SMAW和NAG复合热源焊对其进行焊接试验,通过金相显微镜、万能力学试验机和扫描电镜等分析方法观察和分析接头的组织性能及冲击断口形貌.结果表明:焊接热输入的增加会降低42CrMo和Q235B焊接接头的弯曲性能及低温冲击性能,实际电机转子焊接时应控制焊接热输入、预热温度和层间温度;小热输入焊接工艺制备的42CrMo和Q235B异种钢焊接接头的金相组织、力学性能和冲击断口形貌等技术指标满足企业相关规范,对后续的电机转子的焊接提供有力的技术支持.%The wind turbine rotor is alloy steel 42CrMo and Q235B dissimilar steel structure,the SMAW and MAG hybrid welding are used to perform the welding experiments.Through metallographic microscope,universal mechanical testing machine and scanning electron microscope analysis,the microstructure properties and appearance of fracture of the welded joints are observed and analyzed.The results show that the increase of welding heat input will reduce the bending properties and low temperature impact properties of welded joints of 42CrMo and Q235B,in the actual welding of motor,the welding heat input,preheat temperature and interpass temperature should be controlled;the microstructure,mechanical properties and the appearance of impact fracture and other technical indicators of welded joints in the 42CrMo and Q235B dissimilar steels prepared by a welding technology with a small heat input all meet the relevant standards,which provides strong technical support for the welding of motor rotor.
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