Investigation of heat transfer and fluid flow in high current GTA welding by a unified model
Investigation of heat transfer and fluid flow in high current GTA welding by a unified model
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通过统一模型研究大电流 GTA 焊接中的传热和流体流动
DOI：
10.1016/j.ijthermalsci.2019.04.005
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发表时间：
2019-08
影响因子：
4.5
通讯作者：
Fan Ding
中科院分区：
文献类型：
--
作者：
Wang Xinxin;Luo Yi;Fan Ding
本研究旨在了解大电流钨极气体保护焊（GTAW）过程中电弧等离子体和焊池表面发生显著变形时的传热和流体流动情况。根据实验观测，预先设定一个自由表面变形，建立了包括钨电极、电弧等离子体和低碳钢焊接熔池在内的统一模型。考虑浮力、洛伦兹力、等离子体阻力和马兰戈尼力，研究了自由表面大凹陷时熔池的动力学特性。通过分析熔池表面的热流密度、电流密度、马兰戈尼力和等离子体阻力，了解电弧等离子体向熔池传递热量和动量的过程。结果表明：在凹陷熔池表面，热流密度、电流密度和温度分布呈双峰型；表面严重凹陷的熔池中金属液的流动由等离子体阻力而非马兰戈尼力决定。洛伦兹力的作用比浮力更重要，但比马兰戈尼力弱。所得结果与已有的实验和理论结果一致。
This research is aimed to understand the heat transfer and fluid flow of the arc plasma and weld pool with a significant deformation of the weld pool surface during high current gas tungsten arc welding (GTAW). A unified model including the tungsten electrode, arc plasma and the weld pool of low carbon steel is developed by presetting a free surface deformation from the experimental observations. Buoyance, Lorentz force, plasma drag force and Marangoni force are taken into account to investigate the weld pool dynamics with a great depressed free surface. Heat flux, current density, Marangoni force and plasma drag force at the weld pool surface are presented to understand the heat and momentum transfer from the arc plasma to the weld pool. It is found that the distributions of the heat flux and current density as well as temperature at the depressed weld pool surface are double-peak profiles; the molten metal flow of the weld pool with severe surface depression are determined by the plasma drag force rather than the Marangoni force. The effect of the Lorentz force is more important than that of the buoyance, but weaker than the Marangoni force. The results are consistent with the existing results of both the experiment and the theory.
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影响因子：
4.5
作者：
N. Yadaiah;S. Bag
通讯作者：
N. Yadaiah;S. Bag
DOI：
10.1016/j.ijheatmasstransfer.2015.09.016
发表时间：
2016
影响因子：
5.2
作者：
Yan Li;Yanhui Feng;Yafei Li;Xinxin Zhang;Chuansong Wu
通讯作者：
Yan Li;Yanhui Feng;Yafei Li;Xinxin Zhang;Chuansong Wu
DOI：
10.1007/bf02645925
发表时间：
1986-12
期刊：
Metallurgical Transactions A
影响因子：
--
作者：
Sindo Kou;Y. Wang
通讯作者：
Sindo Kou;Y. Wang
影响因子：
2
作者：
Who Kim;H. Fan;S. Na
通讯作者：
Who Kim;H. Fan;S. Na
DOI：
--
发表时间：
2013
期刊：
--
影响因子：
--
作者：
M. Lin;T. Eagar
通讯作者：
M. Lin;T. Eagar