Analysis on Non-climbing Slope of Brazing Filler Material during Brazing of Motor Rotor

In order to solve the non-climbing slope problem of brazing filler material in the olocalization process of brazing filler material and flux for motor rotors in India branch, the oxygen content, melting temperature range and inclusion content of the brazing filler material were tested by using the ONH instrumental determination, DSC differential scanning calorimetry and energy disperse spectroscopy（EDS）, respectively. The microstructure of the brazing filler material was analyzed by using scanning electron microscopy（SEM）. The flux spreadability and wetting behavior of the brazing filler material were analyzed using high temperature wetting furnace. The reason of non-climbing slope of the brazing filler material was found out, which is high O, S and P content of the brazing filler material and weak ability to remove oxide film of the brazing flux at high temperature. The measures of increasing brazing temperature and prolonging brazing time were taken, and the localization verification of the brazing filler material for rotor brazing in India branch had been completed.