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	The study of surface-active element oxygen on flow patterns and penetration in A-TIG welding
	Zhao, Yuzhen ; Shi, Yaowu ; Lei, Yongping
	2010-05-10 ; 2010-05-10
关键词	TYPE-304 STAINLESS-STEEL FLUID-FLOW MARANGONI CONVECTION POOL DEVELOPMENT GTA METAL Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering
中文摘要	A three-dimensional mathematical model was developed to simulate the flow patterns and temperature distributions in a moving A-TIG weld pool of 304 stainless steels with different oxygen content using PHOENICS software. It is shown that the surface-active element, oxygen, is important, because it affects the weld shape by changing the flow patterns in the weld pool. The weld bead penetration and the depth/width ratio increase first sharply and then remain nearly a constant with increasing oxygen content. Depending upon the oxygen contents, three, one, or two vortexes that have different positions, strength, and directions may be found in the weld pool. Oxygen can cause significant changes in the weld shape by varying the sign of the surface tension coefficient. The situation with the maximum surface tension moves from the edge to the center with increasing oxygen content. As oxygen content exceeds a critical value, a positive surface tension coefficient dominates the flow patterns. The vortexes with opposite directions caused by positive surface tension coefficient can efficiently transfer the thermal energy from the arc, creating a deep weld pool. The critical oxygen content increases with the increase of the welding current.
语种	英语 ; 英语
出版者	MINERALS METALS MATERIALS SOC ; WARRENDALE ; 184 THORN HILL RD, WARRENDALE, PA 15086 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/21270]
专题	清华大学
推荐引用方式 GB/T 7714	Zhao, Yuzhen,Shi, Yaowu,Lei, Yongping. The study of surface-active element oxygen on flow patterns and penetration in A-TIG welding[J],2010, 2010.
APA	Zhao, Yuzhen,Shi, Yaowu,&Lei, Yongping.(2010).The study of surface-active element oxygen on flow patterns and penetration in A-TIG welding..
MLA	Zhao, Yuzhen,et al."The study of surface-active element oxygen on flow patterns and penetration in A-TIG welding".(2010).

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