Electromagnetic Pulse Welding Simulation for H-Type Coil and Analysis of the Influence of Coil Cross-Sectional Structure
Li Chengxiang1, Shi Xin1, Zhou Yan1, Du Jian1,2, Yao Chenguo1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 2. State Grid Chongqing Electric Power Company Yongchuan Power Supply Branch Chongqing 402160 China
Abstract：Electromagnetic pulse welding is an environmentally friendly and convenient solid-state welding technology, which has broad application prospects in dissimilar metal welding. The welding coil, as the main component of the welding system, its structure is one of the key factors affecting the welding quality. In this paper, focusing on the commonly used H-type welding coils, the finite element simulation analysis model for the electromagnetic pulse welding of copper plate and aluminum plate is built, which couples the circuit module, magnetic field module and solid mechanics module. The current of the discharge circuit during the welding process, the distribution of the magnetic field, the eddy current and the Lorentz force on the workpiece, the deformation speed and displacement of the workpiece are calculated. Moreover, the collision process of the workpiece and the welding effect in electromagnetic pulse welding using three typical cross-section H-type coils (5-5H, 2.5-5H, 7.5-5H) are compared and analyzed based on the welding window theory. The results show that the displacement and deformation area of the copper and aluminum plates will change under different cross-section coils, thereby causing differences in the collision angle, the collision speed, the movement speed of the tip of the collision and their changes. Under the same welding energy, the time intervals of the collision angle and the coil tip movement speed of 2.5-5H, 5-5H, 7.5-5H coils within the welding window range are 0.5μs, 0.5μs and 0.65μs, respectively, and the corresponding lengths of the welding seam are 1.015 0mm, 1.202 6mm and 1.440 7mm, respectively. It can be seen that for H-type coils, within a certain range, the wider the coil on the copper plate side is than that on the aluminum plate side, the better it is to realize welding. This paper provides a reference for the design of H-type welding coils.
李成祥, 石鑫, 周言, 杜建, 姚陈果. 针对H型线圈的电磁脉冲焊接仿真及线圈截面结构影响分析[J]. 电工技术学报, 2021, 36(23): 4992-5001.
Li Chengxiang, Shi Xin, Zhou Yan, Du Jian, Yao Chenguo. Electromagnetic Pulse Welding Simulation for H-Type Coil and Analysis of the Influence of Coil Cross-Sectional Structure. Transactions of China Electrotechnical Society, 2021, 36(23): 4992-5001.
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