Status of three-dimensionalweld pool surface and weld penetration in tig welding

doi:10.11900/0412.1961.2013.00819

	Status of three-dimensionalweld pool surface and weld penetration in tig welding
	Zhang, Gang; Shi, Yu; Li, Chunkai; Huang, Jiankang; Fan, Ding
刊名	Jinshu Xuebao/Acta Metallurgica Sinica
	2014-08-11
卷号	50 期号:8 页码:995-1002
关键词	CCD cameras Gas welding Inert gas welding Inert gases Arc welding process Complete joint penetrations Free surfaces Intelligent welding Laser vision Partial penetration TIG-welding Weld joints
ISSN号	04121961
DOI	10.11900/0412.1961.2013.00819
英文摘要	Measurement of the weld pool surface is a difficult but urgent task in the welding community. It plays an important role in developing the next generation intelligent welding machines, in particular, controlling the weld joint penetration in automatic welding. In this work, the images of front-side free surface and back-side width of the weld pool are synchronously captured with two CCD cameras in tungsten inert gas (TIG) arc welding process based on laser vision, and the three dimensional weld pool surface is reconstructed using designed algorithm. Then, the correlation between the weld pool surface under different weld joint penetration and its back-side width is analyzed qualitatively. The variation of reflected laser dots shape is reversely simulated under different depths of weld pool surface, which represents the different weld joint penetration, after established the standard model of weld pool, incident, reflected ray and imaging plan's mathematical model. It is found that the change of weld pool surface obtained by this method has an intimate immanent correlation with the weld joint penetration. When the weld joint penetration changes from partial penetration to complete joint penetration, the weld pool surface's shape changes from convexity to concave, and its depth is increasing with the increased back-side width. The row curvature of reflected laser dots is diminishing. When the penetration achieves excessive penetration, the depth of the weld pool surface is more rapidly increased, and the row curvature is also increased. The gathered laser dots is drawn back again at parallel direction. The simulated results associate with the measurement very well. The variations of reflected laser dots shape can represent the degree of weld joint penetration. This research lays a good foundation for the control of weld joint penetration using the characteristics of weld pool surface. © copyright.
语种	中文
出版者	Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112734]
专题	材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室
作者单位	State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Zhang, Gang,Shi, Yu,Li, Chunkai,et al. Status of three-dimensionalweld pool surface and weld penetration in tig welding[J]. Jinshu Xuebao/Acta Metallurgica Sinica,2014,50(8):995-1002.
APA	Zhang, Gang,Shi, Yu,Li, Chunkai,Huang, Jiankang,&Fan, Ding.(2014).Status of three-dimensionalweld pool surface and weld penetration in tig welding.Jinshu Xuebao/Acta Metallurgica Sinica,50(8),995-1002.
MLA	Zhang, Gang,et al."Status of three-dimensionalweld pool surface and weld penetration in tig welding".Jinshu Xuebao/Acta Metallurgica Sinica 50.8(2014):995-1002.