东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (10): 1411-1416.DOI: 10.12068/j.issn.1005-3026.2017.10.009

• 材料与冶金 • 上一篇    下一篇

TIG焊流动、传热及界面跟踪动网格数值模拟

李林敏1,2， 李宝宽1， 刘立超1， 曹霞3   

  1. (1. 东北大学 冶金学院， 辽宁 沈阳110819; 2. 河海大学 能源与电气学院， 江苏 南京211100;3. 国家电网 椒江供电公司， 浙江 台州318000)
  • 收稿日期:2016-04-29 修回日期:2016-04-29 出版日期:2017-10-15 发布日期:2017-10-13
  • 通讯作者: 李林敏
  • 作者简介:李林敏(1990-)，男，浙江台州人，东北大学博士研究生; 李宝宽(1963-)，男，辽宁辽阳人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51574068).

Dynamic Mesh Simulation of Fluid Flow， Heat Transfer and Interface Tracking in TIG Welding Process

LI Lin-min1,2， LI Bao-kuan1， LIU Li-chao1， CAO Xia3   

  1. 1. School of Metallurgy， Northeastern University， Shenyang 110819， China; 2.College of Energy and Electrical Engineering， Hohai University， Nanjing 211100， China; 3. Jiaojiang Electric Power Company， State Grid Corporation of China， Taizhou 318000， China.
  • Received:2016-04-29 Revised:2016-04-29 Online:2017-10-15 Published:2017-10-13
  • Contact: LI Bao-kuan
  • About author:-
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摘要： 基于磁流体力学 (magnetohydrodynamics， MHD) 模型， 采用动网格技术(dynamic mesh method， DMM) 跟踪电弧-熔池界面， 建立了钨极惰性气体 (tungsten insert gas， TIG) 保护焊过程耦合流动、传热、凝固熔化及动网格界面跟踪的数学模型. 首先计算自由燃弧， 得到了准确的弧区速度、温度及压力等参数. 然后分别验证了熔池内电磁力、热浮力、等离子流曳力和Marangoni力4个驱动力. 考虑上述电弧-熔池相互作用， 基于压力的动态平衡跟踪界面， 计算了304不锈钢TIG焊过程， 得到了等离子体冲击造成的熔池中央下凹及边缘上凸现象. 结果表明， 本模型可以得到更准确的界面及熔池形状.

关键词: 数值模拟, 电弧等离子体, 磁流体力学, 界面跟踪, 动网格

Abstract: Based on the magnetohydrodynamic (MHD) model， the dynamic mesh method (DMM) was used to track arc-molten pool interface， and a mathematical model for coupled fluid flow， heat transfer， solidification/melting and dynamic interface tracking during TIG welding process was established. Firstly， a free-burning arc was simulated to obtain the accurate arc parameters， such as the speed， temperature and pressure. Then， the four driving forces of electromagnetic， thermal buoyancy， drag and Marangoni were validated respectively. Considering the arc-molten pool interaction and tracking the interface from pressure balance， the TIG welding process for the 304 stainless steel was simulated and the depression in the pool center and the lifting on the pool periphery caused by plasma shock were obtained. It is shown that the proposed model can simulate the arc-pool interface and molten pool shape more accurately in comparison with the experimental data.

Key words: numerical simulation, arc plasma, magnetohydrodynamics, interface tracking, dynamic mesh

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