Energy efficiency improvement method of magnetic pulse welding based on auxiliary capacitance

To solve the problem of energy loss caused by low energy utilization rate in the process of magnetic pulse welding (MPW), this paper presents a method to recover the energy after the first half wave of pulse current by using auxiliary capacitance. A detailed introduction of the working process of the improved discharge circuit was first carried out. Then experimental investigation of the current waveform of the main discharge circuit and analyzed numerically of the improved MPW system were investigated. The experimental results of the current waveform of the main discharge loop agree well with the simulation results, which verifies the feasibility of the proposed method. The simulation results show that the energy loss decreases from 95.3% before the improvement to 36% after the improvement, and the energy utilization rate increases by 261.5%. According to the welding window theory, the welding quality of this method is the same as that of the traditional method. It shows that this method can greatly improve the energy utilization rate of magnetic pulse welding without reducing the welding quality and verifies the effectiveness of this method.