A theoretical study of molten pool behavior and humping formation in full penetration high-speed gas tungsten arc welding
A theoretical study of molten pool behavior and humping formation in full penetration high-speed gas tungsten arc welding
复制标题
全熔透高速钨极氩弧焊熔池行为及驼峰形成的理论研究
DOI：
10.1016/j.ijheatmasstransfer.2018.12.004
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发表时间：
2019-04
影响因子：
5.2
通讯作者：
Qin Guoliang
中科院分区：
文献类型：
--
作者：
Meng Xiangmeng;Qin Guoliang
高速钨极气体保护焊（GTAW）熔池中复杂的多耦合输运现象使得对全熔深驼峰（FP-驼峰）形成的认识十分困难。本文采用灵敏度分析和量纲分析相结合的方法研究了熔池行为和FP驼峰的形成。首先，敏感性分析和实验验证的数值模型来澄清驱动力的特征熔池行为和缺陷形成的影响定量。结果表明，电弧压力和电弧剪应力对缺陷的形成都有显著的促进作用，且作用大小顺序相同。表面张力对抑制缺陷的形成起主要作用。随后，基于白金汉π-定理进行量纲分析，导出一些物理上有意义的无量纲变量。无因次驼峰频率是包含特征熔池变量和材料性质的无因次组的线性函数。通过附加的数值试验验证了量纲分析结果的合理性，并与试验结果吻合较好。本研究阐明了GTAW中FP峰缺陷的物理起源，并为抑制FP峰缺陷提供了一些基本的指导。
A clear insight into the full penetration humping (FP-humping) formation in high-speed gas tungsten arc welding (GTAW) is difficult owning to the complex and multi-coupled transport phenomena in molten pool. In this paper, sensitivity analysis and dimensional analysis are combined to study the molten pool behavior and FP-humping formation. Firstly, sensitivity analysis and an experimentally-verified numerical model are used to clarify the effect of driving forces on characteristic molten pool behaviors and defect formation quantitatively. The results show that both arc pressure and arc shear stress have considerable effects on promoting defect formation, and their significances are in the same order. The surface tension shows predominant role to suppress defect formation. Subsequently, dimensional analysis based on Buckingham π-theorem is performed to derive some physically meaningful dimensionless variables. The dimensionless humping frequency is a linear function of a dimensionless group containing characteristic molten pool variables and material properties. The reasonability of dimensional analysis result is tested by additional numerical data, and there is a good agreement. This study clarifies the physical origin of FP-humping defect in GTAW, and may also provide some fundamental guidelines for its suppression.
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影响因子：
3.9
作者：
Julia Frankfurter
通讯作者：
Julia Frankfurter
DOI：
--
发表时间：
1983
期刊：
--
影响因子：
--
作者：
S. Tsukamoto;H. Irie;M. Inagaki;T. Hashimoto
通讯作者：
S. Tsukamoto;H. Irie;M. Inagaki;T. Hashimoto
高速熔化极气体保护焊驼峰成形过程的数值模拟
DOI：
--
发表时间：
2009-09
期刊：
金属学报
影响因子：
--
作者：
武传松;陈姬
通讯作者：
陈姬
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