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横向稳态磁场作用下微束等离子电弧数值分析
引用本文:刘海华,赵淘,张志臣,陈豪杰.横向稳态磁场作用下微束等离子电弧数值分析[J].材料科学与工艺,2021,29(1):59-65.
作者姓名:刘海华  赵淘  张志臣  陈豪杰
作者单位:天津市现代机电装备技术重点试验室(天津工业大学),天津300387;天津市现代机电装备技术重点试验室(天津工业大学),天津300387;天津市现代机电装备技术重点试验室(天津工业大学),天津300387;天津市现代机电装备技术重点试验室(天津工业大学),天津300387
基金项目:天津市教委科研计划项目(2019KJ011).
摘    要:为分析外加横向稳态磁场作用下电弧特性与电弧对工件热、力输入的变化规律,本文建立了微束等离子电弧三维模型,将外加磁场简化为背景场添加至模型,使用有限元分析软件COMSOL进行求解计算.结果表明:外加横向稳态磁场作用下,喷嘴内部各项特性均未发生较大变化,喷嘴下方电弧等离子体在洛伦兹力的作用下向x负方向移动,电弧温度、等离子...

关 键 词:稳态磁场  微束等离子  多场耦合  薄壁件  堆焊
收稿时间:2019/11/28 0:00:00

Numerical analysis of micro-plasma arc under the action of transverse steady state magnetic field
LIU Haihu,ZHAO Tao,ZHANG Zhichen,CHEN Haojie.Numerical analysis of micro-plasma arc under the action of transverse steady state magnetic field[J].Materials Science and Technology,2021,29(1):59-65.
Authors:LIU Haihu  ZHAO Tao  ZHANG Zhichen  CHEN Haojie
Affiliation:Tianjin Key Laboratory of Modern Mechatronics Equipment TechnologyTianjin Polytechnic University, Tianjin 300387, China
Abstract:In order to analyze the characteristics of the arc, and the evolution of the heat and force input from the arc to the workpiece under the external transverse steady-state magnetic field, a three-dimensional numerical model of the micro-plasma arc was established in this paper. The external magnetic field is simplified as a background and added to the model. The finite element analysis software COMSOL is used for calculation. The results show that under the external transverse steady-state magnetic field, the arc characteristics in the nozzle have not changed greatly, but the arc plasma under the nozzle moves to the x-negative direction due to Lorentz force, and all the arc temperature, plasma speed and current density deflect correspondingly, resulting in the decrease of heat input and pressure of the workpiece caused by the arc. Finally, the welding test of the thin-walled parts was carried out. The arc profile captured during the test was basically the same as the simulated one. The residual height of the cladding layer increased, the fusion width decreased, and the downward collapse of weld line on both sides disappear in the magnetic field. The external transverse steady-state magnetic field can reduce the heat and force input of the arc to the molten pool, thereby causing the shape change of the weld, and suppressing the downward collapse caused by excessive heat and force input during the welding of thin-walled parts, which is beneficial to the cladding of thin-walled parts.
Keywords:steady-state magnetic field  micro-plasma  multi-field coupling  thin-walled parts  cladding
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