Analysis of Metal Jet Emission at High-Speed Oblique Collision Interface and Impact Welding Mechanism of Dissimilar Metal Joints

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Metal jet emission and weld interface formation in impact welding were investigated for dissimilar metal lap joints. Numerical simulation of oblique collision between metal plates was performed using smoothed particle hydrodynamics(SPH) method for various plate thicknesses, collision velocities, and collision angles. Metal jet emission and formation of the characteristic wavy weld interface in impact welding were reproduced successfully. The composition of the metal jet was governed by the degree of relative density difference between two metals. Several types of lap joints were fabricated by magnetic pulse welding(MPW). Experimental results were in good agreement with the simulation results.