Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO2) Double Shielded GTA Welding

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	Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO2) Double Shielded GTA Welding
	Lu, Shanping 1; Fujii, Hidetoshi 2; Nogi, Kiyoshi 2
通讯作者	Lu, Shanping(shplu@imr.ac.cn)
	2010-02-01
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	26 期号:2 页码:170-176
摘要	Double shielded gas tungsten arc welding (GTAW, also known as tungsten inert gas (TIG) welding) of an SUS304 stainless steel with pure inert argon as the inner layer shielding and the Ar-CO2 or CO2 active gas as the out layer shielding was proposed in this study to investigate its effect on the tungsten electrode protection and the weld shape variation. The experimental results showed that the inner inert argon gas can successfully prevent the outer layer active gas from contacting and oxidizing the tungsten electrode during the welding process. Active gas, carbon dioxide, in the outer layer shielding is decomposed in the arc and dissolves in the liquid pool, which effectively adjusts the active element, oxygen, content in the weld metal. When the weld metal oxygen content is over 70x10(-6), the surface-tension induced Marangoni convection changes from outward into inward, and the weld shape varies from a wide shallow one to a narrow deep one. The effect of the inner layer gas flow rate on the weld bead morphology and the weld shape was investigated systematically. The results show that when the flow rate of the inner argon shielding gas is too low, the weld bead is easily oxidized and the weld shape is wide and shallow. A heavy continuous oxide layer on the liquid pool is a barrier to the liquid pool movement.
关键词	Double shielding Weld shape Marangoni convection Gas tungsten arc welding
资助者	National Science Foundation of China ; Science Program of Shenyang City
收录类别	SCI
语种	英语
资助项目	National Science Foundation of China[50874101] ; Science Program of Shenyang City[1071275-0-02]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000275625900013
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：33[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/321006/102752
专题	中国科学院金属研究所
通讯作者	Lu, Shanping
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Osaka Univ, Joining & Welding Res Inst, Osaka 5670047, Japan
推荐引用方式 GB/T 7714	Lu, Shanping,Fujii, Hidetoshi,Nogi, Kiyoshi. Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO2) Double Shielded GTA Welding[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2010,26(2):170-176.
APA	Lu, Shanping,Fujii, Hidetoshi,&Nogi, Kiyoshi.(2010).Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO2) Double Shielded GTA Welding.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,26(2),170-176.
MLA	Lu, Shanping,et al."Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO2) Double Shielded GTA Welding".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 26.2(2010):170-176.