On the calculation of the free surface temperature of gas-tungsten-arc weld pools from first principles: Part II. modeling the weld pool and comparison with experiments |
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Authors: | R T C Choo J Szekely S A David |
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Affiliation: | (1) Department of Metallurgy and Materials Science, University of Toronto, M5S 1A4 Toronto, ON, Canada;(2) Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139 Cambridge, MA;(3) Metals and Ceramics Division, Oak Ridge National Laboratory, 37381 Oak Ridge, TN |
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Abstract: | By combining a mathematical model of the welding arc and of the weld pool, calculations are presented to describe the free
surface temperature of weld pools for spot welding operations. The novel aspects of the treatment include the calculation
of the heat and current fluxes falling on the free weld pool surface from first principles, a realistic allowance for heat
losses due to vaporization, and a realistic allowance for the temperature dependence of the surface tension. The most important
finding reported in this article is that the free surface temperature of weld pools appears to be limited by Marangoni convection,
rather than heat losses due to vaporiza-tion. Furthermore, it was found that once thermocapillary flow can produce high enough
surface velocities (>25 cm/s), the precise nature of the relationship between temperature and surface tension will become
less important. |
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Keywords: | |
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