Numerical simulation of effects of the minor active-element oxygen on the Marangoni convection and the weld shape

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	Numerical simulation of effects of the minor active-element oxygen on the Marangoni convection and the weld shape
	Dong Wenchao; Lu Shanping; Li Dianzhong; Li Yiyi
通讯作者	Lu Shanping(shplu@imr.ac.cn)
	2008-02-01
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	44 期号:2 页码:249-256
摘要	A mathematical model was developed to calculate the 3D transient temperature, velocity distribution and the evolution of weld pool shape in a stationary gas tungsten arc (GTA) weld pool of 304 stainless steels with different oxygen contents. The results indicate that when the oxygen content increased, the convection pattern in the weld pool changed from a dominant outward convection, outward on pool center together with inward on pool periphery, and finally to a dominant inward convection. Accordingly, the weld pool evolves from a shallow wide shape, a spoon-like shape to a deep narrow one. The minor active-element oxygen in the weld pool influences on the temperature coefficient of the surface tension (partial derivative gamma/partial derivative T) directly, which leads to the significant change of the Marangoni convection pattern and hence the weld shape. When the oxygen content is below 80X10(-6), an outward Marangoni convection pattern on the weld pool surface occurs, and forms a shallow and wide weld shape. As the oxygen content exceeding 120x10(-6), the Marangoni convection changes to inward direction and the weld shape varies from a shallow and wide shape to a deep and narrow one. When the oxygen content is between 80x10(-6) and 120x10(-6), the weld pool exhibits a spoon-like shape. And as time going, the outward convection region in the weld pool becomes smaller gradually, and the inward convection region becomes larger. The simulation results agree well with the experimental data under Ar-O-2 mixed shielding stationary GTA welding on SUS304 plates.
关键词	minor active-element oxygen Marangoni convection weld shape numerical simulation
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000253792500023
出版者	SCIENCE PRESS
引用统计	被引频次：24[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/95314
专题	中国科学院金属研究所
通讯作者	Lu Shanping
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Dong Wenchao,Lu Shanping,Li Dianzhong,et al. Numerical simulation of effects of the minor active-element oxygen on the Marangoni convection and the weld shape[J]. ACTA METALLURGICA SINICA,2008,44(2):249-256.
APA	Dong Wenchao,Lu Shanping,Li Dianzhong,&Li Yiyi.(2008).Numerical simulation of effects of the minor active-element oxygen on the Marangoni convection and the weld shape.ACTA METALLURGICA SINICA,44(2),249-256.
MLA	Dong Wenchao,et al."Numerical simulation of effects of the minor active-element oxygen on the Marangoni convection and the weld shape".ACTA METALLURGICA SINICA 44.2(2008):249-256.