Marangoni convection and weld shape variations in Ar-O-2 and Ar-CO2 shielded GTA welding

doi:10.1016/j.msea.2004.05.057

IMR OpenIR

	Marangoni convection and weld shape variations in Ar-O-2 and Ar-CO2 shielded GTA welding
	Lu, SP ; Fujii, H ; Nogi, K
通讯作者	Lu, SP(shplu@jwri.osaka-u.ac.jp)
	2004-08-25
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	380 期号:1-2 页码:290-297
摘要	Increasing the oxygen or the carbon dioxide concentration in the argon-based shielding gas leads to an increase in the weld metal oxygen content when the oxygen or carbon dioxide concentration is to be lower than 0.6 vol. % in the shielding gas. However, when the O-2 or CO2 concentration is higher than 0.6vol.% in the Ar-based shielding gas, the weld metal oxygen is maintained around 200ppm-250ppm. An inward Marangoni convection mode in the weld pool occurs when the weld metal oxygen content is more than 100 ppm. When it is lower than 100 ppm, the Marangoni convection would change to the outward direction and the weld shape varies from a deep narrow to a shallow wide shape. The effective ranges of O-2 and CO2 concentrations for deep penetration are same. A heavy layer of oxides is formed when the O-2 or CO2 concentration in the shielding gas is more than 0.6 vol.%. Based on the thermodynamic calculation of the equilibrium reactions of Fe, Si, Cr and Mn with oxygen in liquid iron for the oxide products, FeO, SiO2, Cr2O3 and MnO and the experimental oxygen content in the weld metal, Cr2O3 and SiO2 oxides are possibly formed at the periphery area of the liquid pool surface under the arc column during the welding process. One model is proposed to illustrate the role of the oxide layer on the Marangoni convection on the pool surface at elevated temperature. The heavy oxide layer inhibited the fluid flow induced by the Marangoni convection and also became a barrier for the oxygen absorption into the molten weld pool. (C) 2004 Elsevier B.V. All rights reserved.
关键词	Marangoni convection weld shape mixed shielding gas oxide layer
DOI	10.1016/j.msea.2004.05.057
收录类别	SCI
语种	英语
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000223330200033
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：126[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/321006/81067
专题	中国科学院金属研究所
通讯作者	Lu, SP
作者单位	1.Osaka Univ, Joining & Welding Res Inst, Ibaraki, Osaka 5670047, Japan 2.Chinese Acad Sci, Inst Mat Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Lu, SP,Fujii, H,Nogi, K. Marangoni convection and weld shape variations in Ar-O-2 and Ar-CO2 shielded GTA welding[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2004,380(1-2):290-297.
APA	Lu, SP,Fujii, H,&Nogi, K.(2004).Marangoni convection and weld shape variations in Ar-O-2 and Ar-CO2 shielded GTA welding.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,380(1-2),290-297.
MLA	Lu, SP,et al."Marangoni convection and weld shape variations in Ar-O-2 and Ar-CO2 shielded GTA welding".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 380.1-2(2004):290-297.