Investigation of flyer plate dynamic behavior in electromagnetic pulse welding

Abstract

Electromagnetic pulse welding (EMPW) is of increasing interest for industrial applications because of its advantages in dissimilar metals welding. During the EMPW process, the flyer plate is driven by the Lorentz force to impact the parent plate. The dynamic behavior of the flyer plate has been investigated in this work, based on the 3D finite element simulation, deformation experiment, and welding experiment of Cu/Al plates. And it can be divided into three stages: the deformation stage, collision stage, and expansion stage. There are two movement directions of the flyer plate, one is parallel to the welding direction, another is parallel to the coil direction, and the two directions are perpendicular each other. The welding also extends from the first collision point to the outside and the end, forming an elliptical welding ring seam gradually. When the discharge voltage is lower than 14 kV, the welding ring is not closed at the end, and when the discharge voltage is higher than 14 kV, the welding ring is closed. The simulation results are in good agreement with the experiment results.