Abstract
The methods used to model thermal plasmas, including treatments of diffusion in arcs in gas mixtures, are reviewed. The influence of thermophysical properties on the parameters of tungsten-inert-gas (TIG) welding arcs, particularly those that affect the weld pool, is investigated using a two-dimensional model in which the arc, anode and cathode are included self-consistently. The effect of changing each of six thermophysical properties on the characteristics of an argon TIG arc is assessed. The influence of the product of specific heat and mass density is found to be particularly important in determining the arc constriction. By examining the influence of the different properties on the heat flux density, current density and shear stress at the anode, it is concluded that the weld pool depth can be increased by using shielding gases with high specific heat, thermal conductivity and viscosity. The effect of metal vapour on the arc and weld pool properties is assessed. The most important effect of the metal vapour is found to be the increased electrical conductivity at low temperatures, which leads to lower heat flux density and current density at the weld pool, implying a shallower weld pool. (review article)
Murphy, A B;
Lowke, J J;
[1]
Tanaka, M;
Yamamoto, K;
Tashiro, S;
[2]
Sato, T
[3]
- CSIRO Materials Science and Engineering, PO Box 218, Lindfield NSW 2070 (Australia)
- Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047 (Japan)
- Taiyo Nippon Sanso Corp., 3054-3 Shimokurosawa, Takane-cho, Hokuto-shi, Yamanashi 408-0015 (Japan)
Citation Formats
Murphy, A B, Lowke, J J, Tanaka, M, Yamamoto, K, Tashiro, S, and Sato, T.
Modelling of thermal plasmas for arc welding: the role of the shielding gas properties and of metal vapour.
United Kingdom: N. p.,
2009.
Web.
doi:10.1088/0022-3727/42/19/194006.
Murphy, A B, Lowke, J J, Tanaka, M, Yamamoto, K, Tashiro, S, & Sato, T.
Modelling of thermal plasmas for arc welding: the role of the shielding gas properties and of metal vapour.
United Kingdom.
https://doi.org/10.1088/0022-3727/42/19/194006
Murphy, A B, Lowke, J J, Tanaka, M, Yamamoto, K, Tashiro, S, and Sato, T.
2009.
"Modelling of thermal plasmas for arc welding: the role of the shielding gas properties and of metal vapour."
United Kingdom.
https://doi.org/10.1088/0022-3727/42/19/194006.
@misc{etde_21473068,
title = {Modelling of thermal plasmas for arc welding: the role of the shielding gas properties and of metal vapour}
author = {Murphy, A B, Lowke, J J, Tanaka, M, Yamamoto, K, Tashiro, S, and Sato, T}
abstractNote = {The methods used to model thermal plasmas, including treatments of diffusion in arcs in gas mixtures, are reviewed. The influence of thermophysical properties on the parameters of tungsten-inert-gas (TIG) welding arcs, particularly those that affect the weld pool, is investigated using a two-dimensional model in which the arc, anode and cathode are included self-consistently. The effect of changing each of six thermophysical properties on the characteristics of an argon TIG arc is assessed. The influence of the product of specific heat and mass density is found to be particularly important in determining the arc constriction. By examining the influence of the different properties on the heat flux density, current density and shear stress at the anode, it is concluded that the weld pool depth can be increased by using shielding gases with high specific heat, thermal conductivity and viscosity. The effect of metal vapour on the arc and weld pool properties is assessed. The most important effect of the metal vapour is found to be the increased electrical conductivity at low temperatures, which leads to lower heat flux density and current density at the weld pool, implying a shallower weld pool. (review article)}
doi = {10.1088/0022-3727/42/19/194006}
journal = []
issue = {19}
volume = {42}
place = {United Kingdom}
year = {2009}
month = {Oct}
}
title = {Modelling of thermal plasmas for arc welding: the role of the shielding gas properties and of metal vapour}
author = {Murphy, A B, Lowke, J J, Tanaka, M, Yamamoto, K, Tashiro, S, and Sato, T}
abstractNote = {The methods used to model thermal plasmas, including treatments of diffusion in arcs in gas mixtures, are reviewed. The influence of thermophysical properties on the parameters of tungsten-inert-gas (TIG) welding arcs, particularly those that affect the weld pool, is investigated using a two-dimensional model in which the arc, anode and cathode are included self-consistently. The effect of changing each of six thermophysical properties on the characteristics of an argon TIG arc is assessed. The influence of the product of specific heat and mass density is found to be particularly important in determining the arc constriction. By examining the influence of the different properties on the heat flux density, current density and shear stress at the anode, it is concluded that the weld pool depth can be increased by using shielding gases with high specific heat, thermal conductivity and viscosity. The effect of metal vapour on the arc and weld pool properties is assessed. The most important effect of the metal vapour is found to be the increased electrical conductivity at low temperatures, which leads to lower heat flux density and current density at the weld pool, implying a shallower weld pool. (review article)}
doi = {10.1088/0022-3727/42/19/194006}
journal = []
issue = {19}
volume = {42}
place = {United Kingdom}
year = {2009}
month = {Oct}
}