Marangoni convection and weld shape variations in He-CO(2) shielded gas tungsten arc welding on SUS304 stainless steel

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	Marangoni convection and weld shape variations in He-CO(2) shielded gas tungsten arc welding on SUS304 stainless steel
	S. P. Lu; H. Fujii; K. Nogi
	2008
发表期刊	Journal of Materials Science
ISSN	0022-2461
卷号	43 期号:13 页码:4583-4591
摘要	Bead-on-plate GTA welding (gas tungsten arc welding) on a SUS304 substrate is carried out to investigate the effect of carbon dioxide gas in the helium base shielding on the oxygen content in the weld pool and the weld shape variations. Experimental results show that small addition of carbon dioxide to the shielding gas can precisely adjust the weld metal oxygen content and change the weld shape from wide shallow type to narrow deep one when the weld pool oxygen content is over the critical value, which is from 68 to 82 ppm, due to the Marangoni convection reversal from the outward to inward mode on the pool surface. The weld depth/width ratio increases two times suddenly when the carbon dioxide content in the torch gas is over 0.4 or 0.2% for 1 mm or 3 mm arc length, respectively. The GTA weld shape depends to a large extent on the pattern and magnitude of the Marangoni convection on the pool surface, which is influenced by the active element oxygen content in the SUS304 pool, temperature coefficient of the surface tension (d sigma/dT), and the temperature gradient on the pool surface (dT/dr, r is the radius of the weld pool surface). Changing the welding parameters will alter the temperature distribution and gradient on the pool surface, and thus, affect the magnitude of the Marangoni convection and the final weld shape.
部门归属	[lu, shanping] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [lu, shanping; 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	Activating Flux Oxide Fluxes Penetration Pool Flow Parameters Elements Metal
URL	查看原文
WOS记录号	WOS:000256090100029
引用统计	被引频次：32[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/321006/32996
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. Marangoni convection and weld shape variations in He-CO(2) shielded gas tungsten arc welding on SUS304 stainless steel[J]. Journal of Materials Science,2008,43(13):4583-4591.
APA	S. P. Lu,H. Fujii,&K. Nogi.(2008).Marangoni convection and weld shape variations in He-CO(2) shielded gas tungsten arc welding on SUS304 stainless steel.Journal of Materials Science,43(13),4583-4591.
MLA	S. P. Lu,et al."Marangoni convection and weld shape variations in He-CO(2) shielded gas tungsten arc welding on SUS304 stainless steel".Journal of Materials Science 43.13(2008):4583-4591.