电机转子感应钎焊用钎料钎剂性能对比和失效分析OACSTPCD

In order to investigate the reasons of product failure resulting from a lot of pores and inclusions at the interface of brazing joints during induction brazing motor rotors using the same grade filler metals produced by different manufacturers,the oxygen content,microstructure and tensile strength of domestic and Indian brazing materials were compared,and the ef-fects of different brazing materials combinations on wettability and brazing joint strength were investigated.The results showed that the average tensile strength of the domestic filler metal was 382.7 MPa,which was 3.8%higher than that of the Indian filler metal.The Indian filler metal with high oxygen content was more likely to form oxidation inclusions with Ca,Fe,P and other inclusion elements in the raw materials,resulting in a significant decrease in the strength of the filler metal.Furthermore,the average wetting area of domestic brazing materials was 286.96 mm2,which was 36.7%higher than that of Indian brazing materials.During brazing with Indian brazing materials,numerous residues containing F and K as well as oxi-dized slag were present in the braze zone,resulted reduced joint strength.Therefore,it was crucial not only to select clean filler metal with excellent fluidity and performance during brazing,but also consider choosing an appropriate flux exhibits high activity levels.