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	Theoretical study of Marangoni convection and weld penetration under influence of high oxygen content in base metal
	Zhao, Y. Z. ; Zhao, H. Y. ; Lei, Y. P. ; Shi, Y. W.
	2010-05-10 ; 2010-05-10
关键词	A-TIG welding oxygen concentration flow patterns weld penetration SHAPE VARIATIONS POOL DEVELOPMENT SURFACE-TENSION FLOW PATTERNS FLUID-FLOW GTA STEEL Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering
中文摘要	A 3D mathematical model is developed to simulate the weld pool development in a moving weld pool of 304 stainless steels with different oxygen concentrations. It is shown that the oxygen can cause significant changes in fluid flow patterns and temperature fields. When oxygen content is,280 ppm, the weld penetration and depth/width ratios increase sharply with increasing oxygen content; positive and negative temperature coefficients of surface tension coexist and cause shallow and wide weld pool. When oxygen content is in the range of 280-500 ppm, positive temperature coefficient of surface tension dominates the flow patterns and causes deep and narrow weld pool. The weld penetration and depth/width ratios remain nearly constant. When oxygen content is >500 ppm, the weld penetration and depth/width ratios decrease again. Vortexes that have different positions, strength and directions may be found in the pool. The vortexes with opposite directions caused by positive temperature coefficient of surface tension can efficiently transfer the thermal energy from the arc, creating a deep weld pool.
语种	英语 ; 英语
出版者	MANEY PUBLISHING ; LEEDS ; STE 1C, JOSEPHS WELL, HANOVER WALK, LEEDS LS3 1AB, W YORKS, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/20291]
专题	清华大学
推荐引用方式 GB/T 7714	Zhao, Y. Z.,Zhao, H. Y.,Lei, Y. P.,et al. Theoretical study of Marangoni convection and weld penetration under influence of high oxygen content in base metal[J],2010, 2010.
APA	Zhao, Y. Z.,Zhao, H. Y.,Lei, Y. P.,&Shi, Y. W..(2010).Theoretical study of Marangoni convection and weld penetration under influence of high oxygen content in base metal..
MLA	Zhao, Y. Z.,et al."Theoretical study of Marangoni convection and weld penetration under influence of high oxygen content in base metal".(2010).

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