{"title":"Effect of Helium-Argon Mixtures on the Heat Transfer and Fluid Flow in Gas Tungsten Arc Welding","authors":"A. Traidia, F. Roger, A. Chidley, J. Schroeder, T. Marlaud","volume":49,"journal":"International Journal of Mechanical and Mechatronics Engineering","pagesStart":223,"pagesEnd":229,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/4755","abstract":"A transient finite element model has been developed\nto study the heat transfer and fluid flow during spot Gas Tungsten\nArc Welding (GTAW) on stainless steel. Temperature field, fluid\nvelocity and electromagnetic fields are computed inside the cathode,\narc-plasma and anode using a unified MHD formulation. The\ndeveloped model is then used to study the influence of different\nhelium-argon gas mixtures on both the energy transferred to the\nworkpiece and the time evolution of the weld pool dimensions. It is\nfound that the addition of helium to argon increases the heat flux\ndensity on the weld axis by a factor that can reach 6.5. This induces\nan increase in the weld pool depth by a factor of 3. It is also found\nthat the addition of only 10% of argon to helium decreases\nconsiderably the weld pool depth, which is due to the electrical\nconductivity of the mixture that increases significantly when argon is\nadded to helium.","references":"[1] W.H. Kim, and S.J. Na, \"Heat and fluid flow in pulsed current GTA\nweld pool\", in Int. J. Heat Mass Tran., 1998, vol 41, pp. 3213-3227.\n[2] H.G. Fan, H.L. Tsai, and S.J. Na, \"Heat transfer and fluid flow in a\npartially or fully\", in Int. J. Heat Mass Tran., 2001, vol 44, pp. 417-428.\n[3] F. Lu, S. Yao, S. Lou, and Y. Li, \"Modeling and finite element analysis\non GTAW arc and weld pool\", in Comput. Mater. Sci., 2004, vol 29, pp.\n371-378.\n[4] A. Traidia, F. Roger, and E. Guyot, \"Optimal parameters for pulsed gas\ntungsten arc welding in partially\", in Int. J. Therm. Sci., 2010, vol 49,\npp. 1197-1208.\n[5] M. Tanaka, and J.J. Lowke, \"Predictions of weld pool profiles using\nplasma physics\", in J. Phys. D: Appl. Phys., 2007, vol 40, pp. R1-R23.\n[6] A.B. Murphy, M. Tanaka, S. Tashiro, T. Sato, and J.J. Lowke, \"A\ncomputational investigation of the effectiveness of different shielding\ngas mixtures for arc\", in J. Phys. D: Appl. Phys., 2009, vol 42, 115205.\n[7] A.B. Murphy et al, \"Modeling of thermal plasmas for arc welding_ the\nrole of the shielding gas properties and of metal vapour \", in J. Phys. D:\nAppl. Phys., 2009, vol 42, 194006.\n[8] P. Sahoo, T. DebRoy, M.T. McNallan, \"Surface tension of binary metal\nsurface active solute systems under conditions relevant to welding\nmetallurgy\", in Metall. Trans. B., 1988, vol 19B, pp. 483-491.\n[9] F. Lago, JJ. Gonzalez, P. Freton, and A. Gleizes. \"A numerical\nmodelling of an electric arc and its interaction with the anode: Part I.\nThe two-dimensional model\", 2004, in J. Phys. D: Appl. Phys. Vol 37,\npp. 883-897.\n[10] JJ. Gonzalez, F. Lago, P. Freton, M. Masqu\u00e8re, and X. Franceries. \"A\nnumerical modelling of an electric arc and its interaction with the\nanode: Part II. The three-dimensional model- influence of external forces\non the arc column\", 2005, in J. Phys. D: Appl. Phys, vol 38, pp. 306-\n318.\n[11] J. Goldak, M. Bibby, J. Moore, and B. Patel, \"Computer modeling of\nheat flow in welds\", in Metall. Trans B. 1986, vol 17, pp. 587-600.\n[12] A.B. Murphy, \"Transport coefficients of Helium and Argon-Helium\nplasmas\", in IEEE Transactions on plasma science, 1997, vol. 25, n\u252c\u2591 5.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 49, 2011"}