Abstract
A numerical study of time-dependent penetration processes in stainless steel with convective forces by stationary gas tungsten arc is described. The numerical solution technique based on finite-difference method was adopted in the development of mathematical models for investigating heat transfer problem in the weld pool. The computational model consists of the transport equations and considers driving forces of fluid flow ; electromagnetic force, surface tension force, and plasma stream shear stress. Surface tension data depending on temperature and sulfur concentration were given in the calculation. It is shown that both of the penetration shape and the surface temperature distribution are affected by convective flow in the weld pool.
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