Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO(2)) Double Shielded GTA Welding

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	Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO(2)) Double Shielded GTA Welding
	S. P. Lu; H. Fujii; K. Nogi
	2010
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-CO(2) or CO(2) 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.
部门归属	[lu, shanping] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [fujii, hidetoshi; nogi, kiyoshi] osaka univ, joining & welding res inst, osaka 5670047, japan.;lu, sp (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;shplu@imr.ac.cn
关键词	Double Shielding Weld Shape Marangoni Convection Gas Tungsten Arc Welding Gas Tungsten Arc Fusion Zone Geometry Marangoni Convection Activating Flux Stainless-steel Oxide Fluxes Deep Penetration Pool Flow Tig
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31344
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. P. Lu,H. Fujii,K. Nogi. Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO(2)) Double Shielded GTA Welding[J]. Journal of Materials Science & Technology,2010,26(2):170-176.
APA	S. P. Lu,H. Fujii,&K. Nogi.(2010).Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO(2)) Double Shielded GTA Welding.Journal of Materials Science & Technology,26(2),170-176.
MLA	S. P. Lu,et al."Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO(2)) Double Shielded GTA Welding".Journal of Materials Science & Technology 26.2(2010):170-176.