Modelling of arc welding : the importance of including the arc plasma in the computational domain

Murphy, Anthony B., Tanaka, Manabu, Yamamoto, Kentaro, Tashiro, Shinichi, Lowke, John J., & Ostrikov, Kostya (2010) Modelling of arc welding : the importance of including the arc plasma in the computational domain. Vacuum, 85(5), pp. 579-584.

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We present results of computational simulations of tungsten-inert-gas and metal-inert-gas welding. The arc plasma and the electrodes (including the molten weld pool when necessary) are included self-consistently in the computational domain. It is shown, using three examples, that it would be impossible to accurately estimate the boundary conditions on the weld-pool surface without including the arc plasma in the computational domain. First, we show that the shielding gas composition strongly affects the properties of the arc that influence the weld pool: heat flux density, current density, shear stress and arc pressure at the weld-pool surface. Demixing is found to be important in some cases. Second, the vaporization of the weld-pool metal and the diffusion of the metal vapour into the arc plasma are found to decrease the heat flux density and current density to the weld pool. Finally, we show that the shape of the wire electrode in metal-inert-gas welding has a strong influence on flow velocities in the arc and the pressure and shear stress at the weld-pool surface. In each case, we present evidence that the geometry and depth of the weld pool depend strongly on the properties of the arc.

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11 citations in Scopus
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18 citations in Web of Science®

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ID Code: 73790
Item Type: Journal Article
Refereed: Yes
Additional Information: Paper presented in The 7th International Symposium on Applied Plasma Science (ISAPS '09), Hamburg, Germany, 2009.
Additional URLs:
Keywords: Arc welding, Computational modelling, Demixing, Metal vapour, Shielding gas, Thermal plasma, Thermophysical properties
DOI: 10.1016/j.vacuum.2010.08.015
ISSN: 0042-207X
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 11 Jul 2014 02:10
Last Modified: 14 Jul 2014 00:26

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