This paper proposes a new arc based additive manufacturing method assisted with external longitudinal static magnetic field. An electromagnetic coupling numerical model has been established, which consists of droplet impingement, heat transfer and dynamics of molten pool. Comparing the simulation results between normal deposition and external longitudinal magnetic filed assisted deposition, it shows that the external longitudinal static magnetic field induces the tangential stirring force in molten pool and drives the molten metal moving to the edge of the pool. This can reduce the temperature gradient in forming region. Furthermore, the related comparison experiments of single-bead deposition and multi-beads overlapping deposition are performed, it was found that the tangential stirring force can reduce the height of single-bead as well as increase the width of single-bead. The experimental results are in accordance with the simulation results. The changing of morphology of the bead is beneficial to multi-beads overlapping and capable of improving the surface accuracy for arc based additive manufacturing parts.
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