Numerical simulation and experimental research on high frequency induction welding of RF connector

Abstract

The welding process of RF connector based on high frequency induction heating was studied by means of numerical simulation of multi-physical field coupling and experiment methods. The distribution of inductive magnetic field, inductive current and temperature field are analyzed. The effects of copper wire radius, coil radius, current frequency, coil current, coil turns and coil-to-shell distance on the heating temperature are analyzed emphatically. The parameter optimization were carried out and verified by experiment. The results show that the copper wire radius and coil radius have little influence on heating temperature. The induction heating temperature increases with the increase of coil turns, coil current and current frequency, and the decrease of coil-to-shell distance. According to the results of stereo microscope and X-ray examination, when the frequency is 800 kHz, the current is 550 A, the distance between coil and shell is 1.5 mm, and the number of coil turns is 2, Sn63Pb37 solder can melt rapidly, filling the solder slot and assembly gap, forming a good combination between RF connector and shell.