外加磁场对薄壁零件堆焊层形貌的影响

针对薄壁零件在微束等离子堆焊过程中两侧的液态金属下淌导致成形不好的问题，开展薄壁零件在堆焊过程中熔池力学行为分析和熔池成形的控制策略研究. 提出了外加磁场的方法，向熔池施加指向内侧的电磁力，对向下流淌的液态金属进行干预，从而抑制液态金属的流淌. 采用有限元软件COMSOL对工件上产生的电磁场、涡流场及附加电磁力进行仿真分析. 在304不锈钢上开展单道多层堆焊试验，获得了不同磁感应强度下的堆焊层形貌. 结果表明，外加磁场能明显改变微束等离子焊的力学行为和成形规律，并能有效抑制边沿液态金属流淌.

Effect of magnetic field on the welding cladding morphology of thin walled parts

For the problem of poor forming in the process of microbeam plasma welding caused by the downward flow of molten metal on both sides of thin-wall parts, the analysis of molten pool mechanical behavior and the research of pool forming control strategy are studied. The method of the external magnetic field is proposed for adding the inside of the electromagnetic pressure to the molten pool, intervening the downward flowing molten metal. The finite element software COMSOL is used to simulate the magnetic flux density, the induced current density and the electromagnetic force on the workpiece. Experiments of single-channel multi-layer welding are performed on 304 stainless steel, and the welding cladding morphology under different magnetic flux density was obtained. The results show that the magnetic field can significantly change the mechanical behavior and forming rules on the microbeam plasma welding, and can effectively restrain the flow of molten metal on the edge.