High-frequency induction brazing of YG8 sintered-carbide to mild steel

YG8 sintered-carbide and mild steel was joined with BNi2 brazing filler metal and with the high frequency induction brazing.The high-frequency induction brazing equipment was rebuild,which measures the real-time temperature with the thermocouple thermodetector and controls the heating temperature of the equipment with the PID controller.The effect of processing parameters including brazing temperature and holding time on the joint mechanical property was discussed by scanning electron microscopes and energy dispersive X-ray spectroscopy.Results show that the maximum shear strength is 441 MPa when the brazing temperature is 1 030℃ and holding time is 5 min.In this case,fracture happens mainly at the YG8 sintered-carbide or the brazing seam.