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

CORC > 金属研究所 > 中国科学院金属研究所

	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
刊名	Journal of Materials Science & Technology
	2006
卷号	22 期号:3 页码:359-366
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
ISSN号	1005-0302
中文摘要	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.
原文出处	://WOS:000238133800018
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/34384]
专题	金属研究所_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.