Numerical simulation of effects of different driving force on surface deformation of weld pool

	Numerical simulation of effects of different driving force on surface deformation of weld pool
	Huang, Yong; Li, Hui; Wang, Xinxin; Yao, Yuhang; Lu, Suzhong
刊名	Hanjie Xuebao/Transactions of the China Welding Institution
	2016-08-25
卷号	37 期号:8 页码:45-49
关键词	Buoyancy Deformation Gas welding Inert gases Surface tension Temperature Vortex flow Welds Driving forces Enthalpy-porosity method Free surface deformations Liquid-solid phase change Surface deformation Tungsten inert gas welding VOF method Weld pool
ISSN号	0253360X
英文摘要	A three-dimensional transient mathematical model of weld pool for a stationary tungsten inert gas welding was established based on the fluid dynamic equations. In this model, enthalpy-porosity method was used to handle liquid-solid phase change, VOF method was employed to track the free surface deformation of the weld pool. By solving these equations, the deformation behavior of surface and the distributions of temperature and velocity were obtained under the independent action by buoyancy, Marangoni force, electromagnetic force and arc pressure, respectively. The results indicate that,at high welding current (I≥250 A), a surface projection forms in weld pool when buoyancy, Marangoni force with positive temperature coefficient of surface tension and electromagnetic force were acted independently, while a surface depression formsunder the action of arc pressure, Marangoni force with negative temperature coefficient of surface tension. At high welding current, weld pool depression phenomenon appears for both TIG welding and activated flux TIG welding. For TIG welding, there exists an inward vortex in the central zone of the weld pool, while a outward vortex appears in the periphery.For activated flux TIG welding, two inward vortexes are induced by different factors in the central zone and periphery of the weld pool,respectively. The magnitude of surface deformation was not superimposed simply by each driving force. © 2016, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.
语种	中文
出版者	Harbin Research Institute of Welding
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112516]
专题	材料科学与工程学院
作者单位	State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Huang, Yong,Li, Hui,Wang, Xinxin,et al. Numerical simulation of effects of different driving force on surface deformation of weld pool[J]. Hanjie Xuebao/Transactions of the China Welding Institution,2016,37(8):45-49.
APA	Huang, Yong,Li, Hui,Wang, Xinxin,Yao, Yuhang,&Lu, Suzhong.(2016).Numerical simulation of effects of different driving force on surface deformation of weld pool.Hanjie Xuebao/Transactions of the China Welding Institution,37(8),45-49.
MLA	Huang, Yong,et al."Numerical simulation of effects of different driving force on surface deformation of weld pool".Hanjie Xuebao/Transactions of the China Welding Institution 37.8(2016):45-49.