Numerical investigations of arc behaviour in gas metal arc welding using ANSYS CFX

作     者：M. SCHNICK U. FUESSEL M. HERTEL A. SPILLE-KOHOFF A. B. MURPHY 

作者机构：Institute of Surface and Manufacturing Technology Technische Universitat Dresden Dresden Germany CFX Berlin Software GmBH Berlin Germany CSIRO Materials Science and Engineering Lindfield NSW 2070 Australia 

出 版 物：《Frontiers of Materials Science》 (材料学前沿（英文版）)

年 卷 期：2011年第5卷第2期

页      面：98-108页

核心收录：

学科分类：081704[工学-应用化学] 081803[工学-地质工程] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0818[工学-地质资源与地质工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：DFG which is gratefully acknowledged.Many thank to J.J.Lowke,Prof.M.Tanaka and D.Uhrland for the discussions of these results 

主　　题：arc welding numericai simulation GMAW, ANSYS CFX 

摘      要：Current numerical models of gas metal arc welding（GMAW）are trying to combine magnetohydrodynamics （MRD） models of the arc and voiume of fluid （VoF） models of metal transfer They neglect vaporization and assume an argon atmosphere for the arc region, as it is common practice for models of gas tungsten arc welding, These models predict temperatures above 20 000K anda temperature distribution similar to tungsten inert gas （TIG） arcs： However. current spectroscopic temperature measuretemperatures. In contrast to TIG arcs temperature distrbution. The paper vapour and which is in a yery good res, Futhermore; the model is abile to predict the local central minimum in the radial temperature and the radial electric current density distributions for the first time. The axially symmetric model of the welding torch, the work piece, the wire and the arc （fluid domain） implements MHD as well as turbulent mixing and thermal demixing of metal vapour in argon. The mass fraction of iron vapour obtained from the simulation shows an accumulation in the arc core and another accumulation on the fringes of the arc at 2000 to 5000 K. The demixing effects lead to very low concentrations of iron between these two regions. Sensitive analyses demonstrate the influence of the transport and radiation properties of metal vapour, and the evaporation rate relative to the wire feed. Finally the model predictions are compared with the measuring results of Zielihska et al.