In this study the high velocity impact welding was used to join thin plates made of low carbon steel (grade 1006). A flyer plate was accelerated by a powder gun to a velocity of 735 m/s and then impacted a non-moving parent plate at an angle of 15°. These conditions provided a high quality joining between the plates. The process of impact was observed using a high-speed video camera which allowed to detect formation of a re-entrant jet moving ahead of the collision point. The welded sample was characterized using optical microscopy. A typical wavy interface and molten regions were observed. The ferrite grains near the boundary between the plates were significantly elongated. The heat and deformation affected only a narrow zone along the interface, while the most part of material was not affected. The process of collision was simulated using SPH solver in Ansys Autodyn software. The formation of jet, waves and vortices was clearly reproduced. The temperature field and strain field were plotted and analyzed based on simulation results.

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