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Artikel
The Role of Surfactant Mass Transfer in GTA-Welding.
| Författare: |
Winkler, C., Amberg, G.A., Koseki, T. |
| Dokumenttyp: |
Konferens |
| Tillstånd: |
Accepterad |
| Tidskrift: |
Mathematical Modeling of Weld Phenomena 5. Institute of Materials, London, 1999 |
| Volym: |
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| År: |
1999 |
AbstractOne shortcoming in modeling GTA-welding on stainless steel plates is the necessity of an adjustment of the concentration of surface active elements in order to achieve agreement in the weld pool shapes of experiment and simulation. In this study it is shown that this shortcoming can be overcome if the surfactant concentration is allowed to depart from its thermodynamical equilibrium. Thus, the surfactant concentration can vary in the liquid bulk and at the surface of the weld pool where it accumulates at stagnation points. The redistribution of surfactants in the bulk and at the surface is described by mass transfer equations for the surfactants. The physicochemical model incorporates molecular transport of surfactants due to convection, diffusion and sorption. The calculated redistribution of surfactants at the surface is checked and confirmed using surface analysis techniques as electron probe microanalysis and Auger electron spectroscopy.
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