Effect of welding parameters on GTA weld shape for pure iron plate under Ar-O-2 mixed shielding

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	Effect of welding parameters on GTA weld shape for pure iron plate under Ar-O-2 mixed shielding
	S. P. Lu; H. Fujii; K. Nogi
	2006
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	22 期号:3 页码:359-366
摘要	Weld shape variation for different welding parameters is investigated on pure iron plate under gas tungsten arc (GTA) welding with argon-oxygen mixed shielding. Results showed that small addition of oxygen to the argon base shielding gas can effectively adjust the oxygen adsorption to the molten pool. An inward Marangoni convection occurs on the pool surface when the oxygen content in the weld pool is over the critical value, 80x10(-6), for pure iron plate under Ar-0.3% O-2 mixed shielding. Low oxygen content in the weld pool changes the inward Marangoni to an outward direction under the Ar-0.1% O-2 shielding. The GTA weld shape depends to a large extent on the pattern and strength of the Marangoni convection on the pool surface, which is determined by the content of surface active element, oxygen, in the weld pool and the welding parameters. The strength of the Marangoni convection on the liquid pool is a product of the temperature coefficient of the surface tension (d sigma/dT) and the temperature gradient (dT/dr) on the pool surface. Different welding parameters will change the temperature distribution and gradient on the pool surface, and therefore, affect the strength of Marangoni convection and the weld shape.
部门归属	chinese acad sci, inst met res, shenyang 110016, peoples r china. osaka univ, joining & welding res inst, ibaraki, osaka 5670047, japan.;lu, sp (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china;shplu@imr.ac.cn
关键词	Weld Shape Oxygen Marangoni Convection Mixed Shielding Gas Type-304 Stainless-steel Surface-active Elements Nitrogen Absorption Pool Development Activating Flux Gas Arc Penetration Metal Variables
URL	查看原文
WOS记录号	WOS:000238133800018
引用统计	被引频次：5[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/321006/34384
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. Effect of welding parameters on GTA weld shape for pure iron plate under Ar-O-2 mixed shielding[J]. Journal of Materials Science & Technology,2006,22(3):359-366.
APA	S. P. Lu,H. Fujii,&K. Nogi.(2006).Effect of welding parameters on GTA weld shape for pure iron plate under Ar-O-2 mixed shielding.Journal of Materials Science & Technology,22(3),359-366.
MLA	S. P. Lu,et al."Effect of welding parameters on GTA weld shape for pure iron plate under Ar-O-2 mixed shielding".Journal of Materials Science & Technology 22.3(2006):359-366.