超薄壁不锈钢圆管的磁控微束等离子弧焊接数值模拟

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Abstract： Ultra-thin-walled stainless steel round pipe has become an important material for high-precision welding becauseof its excellentcharacteristicssuchas light weight，high strengthandcorrosionresistance.Because ofits thin wallthicknessand high thermal sensitivity，the useof traditional micro-beam plasma arc welding process is prone to problems such asunstable welding performance.Therefore，using numerical simulation method to studythe process of magnetic-controlled microbeam plasma arc weldingof ultra-thin-walled stainless steel round tubecan provide theoretical guidance for optimizing welding process and improving welding quality.In the processof micro-beam plasmaarc weldingof ultra-thin-walled stainless stelround tube under alternating transverse magnetic field，the heattransfer processofmicro-beamplasmaarcisaffected bythecombinedactionof induced magnetic field，internal electric field，flow fieldandexteral magneticfield，andthemulti-physical fieldcouplingof“electric-heat-fluidmagnetic field”is formed.A two-dimensional magnetohydrodynamic model was established according to the multiphysical coupling relationship of the magnetic-controlled microbeam plasma arc discharge.The two-dimensional numerical simulation of the multi-physical fieldof the magnetic-controlled microbeam plasma arc discharge was caried out by using COMSOL software. The temperature field、flow field and electric field distribution of the microbeam plasma arc in the discharge range and the temperature distribution at the heating point of the ultra-thinwalled stainlessteel round tube were obtained.The results show that the alternating transverse magnetic field can change the shapeofthe micro plasmaarcand thus change the heat input on the surfaceof the ultra-thin wallstainless steel round tube. This effectively improves the welding forming quality.

Keywords： ultra-thin-walled stainlesssteel round tube; alternating transverse magnetic field; microbeam plasma arc; numerical simulation

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近几年，超薄不锈钢薄壁板材（壁厚 <0.3mm 在精密仪器制造、核工业、航空航天等领域得到了广泛应用[1]。（剩余6958字）