Influence of welding parameters and shielding gas composition on GTA weld shape

IMR OpenIR

	Influence of welding parameters and shielding gas composition on GTA weld shape
	Lu, SP ; Fujii, H ; Nogi, K
通讯作者	Lu, SP(shplu@jwri.osaka-u.ac.jp)
	2005
发表期刊	ISIJ INTERNATIONAL
ISSN	0915-1559
卷号	45 期号:1 页码:66-70
摘要	The interaction between the variable welding parameters and shielding gas composition in determining the weld shape in Ar-CO2 shielded gas tungsten arc (GTA) welding with SUS304 stainless steel is discussed. The GTA weld shape depends to a large extent on the pattern and strength of the Marangoni convection on the pool surface, which is controlled by the content of surface active element, oxygen, in the weld pool and the welding parameters. Results showed that oxygen absorption into the liquid pool during the welding process is sensitive to the CO2 concentration in the shielding gas. An inward Marangoni convection occurs on the pool surface when the oxygen content is over 100 ppm in the welding pool under Ar-0.3%CO2 shielding. A low oxygen content in weld pool changes the inward Marangoni convection to an outward direction under the Ar-0.1%CO2 shielding. 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.
关键词	GTA welding Marangoni convection penetration oxygen mixed shielding gas
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000228609300011
出版者	IRON STEEL INST JAPAN KEIDANREN KAIKAN
引用统计	被引频次：25[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/321006/82716
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, Osaka 5670047, Japan 2.Chinese Acad Sci, Met Res Inst, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Lu, SP,Fujii, H,Nogi, K. Influence of welding parameters and shielding gas composition on GTA weld shape[J]. ISIJ INTERNATIONAL,2005,45(1):66-70.
APA	Lu, SP,Fujii, H,&Nogi, K.(2005).Influence of welding parameters and shielding gas composition on GTA weld shape.ISIJ INTERNATIONAL,45(1),66-70.
MLA	Lu, SP,et al."Influence of welding parameters and shielding gas composition on GTA weld shape".ISIJ INTERNATIONAL 45.1(2005):66-70.