Abstract
Electromagnetic pulse welding (EMPW) is a process that achieves metallurgical bonding through the collision of metal plates driven by a Lorentz force. EMPW has several advantages, including high welding efficiency, low overall welding temperature, and no pollution. It is suitable for a wide range of metal plate connections. Single H-type and double H-type coils are commonly used in plate welding due to their simple structure, small size, and convenient assembly. The majority of existing research has focused on the influence of process parameters on the quality of plate welding, with a paucity of comparative studies on the welding performance of these two coils. In this paper, two types of coils are employed to weld a Cu-Al plate using the finite element method, with the initial relative velocity of collision, energy utilization rate, and effective welding width analyzed. The results indicate that, in terms of the initial relative velocity of the collision, the double H-type coil will exceed the single H-type coil as the distance between the plates increases. Furthermore, the double H-type coil can apply Lorentz force to two plates simultaneously, resulting in a higher energy utilization rate. In terms of effective weld width, in the case of a small distance between plates, with the increase of discharge voltage, a single H-type coil can also achieve a better welding performance. The above relevant conclusions will provide some guidance in choosing which H-type coils to use in electromagnetic pulse welding of plate.
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