等离子弧焊接多物理场耦合输运模型  

A Multiphysics Coupled Transport Model for Plasma Arc Welding

作　　者：李岩 陈岩[1] 王领 武传松 LI Yan;CHEN Yan;WANG Ling;WU Chuan-Song(College of Mechanical and Transportation Engineering,China University of Petroleum-Beijing,Beijing 102249,China;Beijing Key Laboratory of Process Fluid Filtration and Separation,China University of Petroleum-Beijing,Beijing 102249,China;MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing,Institute of Materials Joining,Shandong University,Jinan 250061,China)

机构地区：[1]中国石油大学(北京)机械与储运工程学院,北京102249 [2]中国石油大学(北京)过程流体过滤与分离技术北京市重点实验室,北京102249 [3]山东大学材料液固结构演变与加工教育部重点实验室,济南250061

出　　处：《工程热物理学报》2021年第8期2113-2121,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.52076216,No.51706246)。

摘　　要：本文基于电场、磁场、温度场和流场的多物理场耦合,建立了简单实用的电弧与工件一体化模型,既准确表征等离子弧焊接过程中的多物理场输运作用,又无需使用流体体积函数(VOF)计算气液两相界面,大大减少计算时间和成本。模型计算出电弧压力分布,将其简化为压力源项作用于工件表面,同时该界面上电弧与工件耦合传热,实现了电弧与工件的热-力传递。获得了焊接过程电弧和工件的温度、速度、电流密度和电磁力的分布规律,揭示了焊接熔池的形成和演变机制,并开展实验验证了模型的准确性。最后分析了不同工艺参数对电弧热流密度和压力的影响规律,为焊接质量优化提供理论指导。Based on multiphysics coupling of electric field,magnetic field,temperature field and flow field,a user-friendly integrated model of plasma arc and workpiece was established in this paper.It can accurately represent the multiphysics interactions in plasma arc welding but greatly reduce calculation time and cost,since it need not use Volume of Fluid(VOF)method to calculate the gas-liquid two-phase interface.The model calculates a precise arc pressure distribution,and then it acts on the workpiece as a source term.Meanwhile,the hot arc conduct heat to workpiece through the interface so that both heat and pressure force can transport from the arc to the workpiece.Temperature,velocity,current density and electromagnetic force of the arc and workpiece during the welding process are obtained,and the formation and evolution mechanism of weld pool are revealed.Welding experiment is carried out and verifies the model’s accuracy.Finally,influence of different process parameters on heat flux and arc pressure is analyzed by the model to provide theoretical guidance for the optimization of welding quality.

关 键 词：多物理场 等离子弧焊接 热流密度 电弧压力 焊接熔池 

分 类 号：TK121[动力工程及工程热物理—工程热物理]