EFFECT OF VARIOUS DRIVING FORCES ON HEAT AND MASS TRANSFER IN ARC WELDING
EFFECT OF VARIOUS DRIVING FORCES ON HEAT AND MASS TRANSFER IN ARC WELDING
复制标题
DOI：
10.1080/10407789708913910
复制
发表时间：
1997-11
影响因子：
2
通讯作者：
Who Kim;H. Fan;S. Na
中科院分区：
文献类型：
--
作者：
Who Kim;H. Fan;S. Na
摘要 在这项研究中，研究了使用氩气保护气体的固定式钨极气体保护焊中熔池的传热和流体流动。从焊接电弧到母材表面的传输现象，如电流密度、热通量、电弧压力和作用在熔池表面的剪切应力，均来自相应焊接电弧的模拟结果。考虑了焊池对流的各种驱动力：自感电磁、表面张力、浮力和撞击等离子弧力。此外，还考虑了由于电弧压力作用于熔池表面而导致的表面凹陷的影响。由于焊接过程中熔合边界具有弯曲且形状未知的特点，采用边界拟合坐标系来精确描述动量方程的边界。将数值模型应用于AISI304不锈钢并与实验结果进行比较。
Abstract In this study the heat transfer and fluid flow of the molten pool in stationary gas tungsten arc welding using argon shielding gas were investigated. Transporting phenomena from the welding arc to the base material surface, such as current density, heat flux, arc pressure, and shear stress acting on the weld pool surface, were taken from the simulation results of the corresponding welding arc. Various driving forces for the weld pool convection were considered: self-induced electromagnetic, surface tension, buoyancy, and impinging plasma arc forces. Furthermore, the effect of surface depression due to the arc pressure acting on the molten pool surface was considered. Because the fusion boundary has a curved and unknown shape during welding, a boundary-fitted coordinate system was adopted to precisely describe the boundary for the momentum equation. The numerical model was applied to AISI304 stainless steel and compared with the experimental results.