TIG焊接电弧与熔池统一模型有限元分析
Finite Element Analysis on United Model of TIG Welding Arc and Pool
摘 要
根据磁流体动力学理论以及焊接的实际情况,建立了三维TIG焊接电弧与熔池的统一数学模型,避免了对电弧以及熔池界面条件的假定,使得对焊接电弧与熔池行为的分析与实际情况更近了一步.运用该数学模型对TIG焊接电弧和熔池的流场和热场进行了有限元分析.采用等效比热法来确定液相分数,假定固液相等同区来解决工件熔化区与非熔化区的移动边界.结果表明:用数学模型模拟出的电弧行为特征以及熔池形状与试验结果相吻合.
电弧与熔池
统一数学模型
有限元分析
TIG welding
arc and pool
united mathematical model
finite element method
Abstract
Based on the theory of magneto-hydro dynamics and real welding conditions,a three-dimension united mathematical model of TIG welding arc and weld pool was established.This model avoided the assumption of constant conditions of interface between welding arc and pool,and made analysis on behavior of arc and pool more near to real situation.Fluid flow and heat transfer of TIG welding arc and pool were analyzed based on built model with finite element analysis method.Equivalent latent heat was adopted to determine liquid quantity and solid-liquid identity was adopted to solve moving interface between molten and solid region.Computational results of welding arc and pool were close to those of the experiments.
中图分类号 TG44
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收稿日期 2004/10/13
修改稿日期 2004/12/22
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备注芦凤桂(1975-),女,山东聊城人,讲师,博士.
引用该论文: LU Feng-gui,TANG Xin-hua,LI Shao-qing,YAO Shun,LOU Song-nian. Finite Element Analysis on United Model of TIG Welding Arc and Pool[J]. Materials for mechancial engineering, 2006, 30(3): 31～34
芦凤桂,唐新华,李少青,姚舜,楼松年. TIG焊接电弧与熔池统一模型有限元分析[J]. 机械工程材料, 2006, 30(3): 31～34
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参考文献
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【2】Choo R T C,Szekely J,Westhoff R C.On the calculation of the free surface temperature of gas-tungsten-arc weld pools from first principles：part Ⅰ.modeling the welding arc[J].Metall Trans B,1992,23B:357-369.
【3】Choo R T C,Szekely J,Westhoff R C.On the calculation of the free surface temperature of gas-tungsten-arc weld pools from first principles：part Ⅱ.modeling the weld pool and comparision with experiments[J].Metall Trans B,1992,23B:371-384.
【4】Fan H G,Tsai H L,Na S J.Heat transfer and fluid flow in a partially or fully penetrated weld pool in gas tungsten arc welding[J].International Journal of Heat and Mass Transfer,2001,44:417-428.
【5】Wu C S.Computer simulation of three-dimensional convection in traveling MIG weld pool[J].Engineering Computations,1992,9:529-537.
【6】Hsu K C,Etemadi K,Pfender E.Study of the free-burning high-intensity argon arc[J].J Appl Phys,1983,54(3):1293-1299.
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