文献类型：会议论文

英文题名：Laser welding of lightweight structures: Finite element modeling of a thin aluminum plate

作者：An, Yuansheng[1];Semetay, Cumah[2];Nied, Herman F.[2]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai, Peoples R China;[2]Lehigh Univ, Dept Mech Engn & Mech, Bethlehem, PA 18015 USA

会议论文集：International Conference on Health Monitoring of Structure, Material and Environment

会议日期：OCT 16-18, 2007

会议地点：SE Univ, Nanjing, PEOPLES R CHINA

主办单位：SE Univ

语种：英文

外文关键词：laser welding; aluminum; finite element; LENS; residual stress; distortion

摘要：Laser welding is recognized as a high power density joining process. Unlike traditional welding processes where the heat penetration is limited due to the lower power density, laser welding offers a more accurate and less destructive joining method for even hard to weld metals like aluminum. However, distortion is still an issue for very thin structures. In order to optimize the welding parameters to obtain a less distorted shape, it is important to understand how the welding parameters influence the residual stresses and distortion. In this study finite element analysis and a set of experiments are performed to examine the distortional behavior. A thin aluminum plate subjected to autogenous laser welding is modeled using SYSWELD (a commercial finite element package), specifically developed for welding problems. Experimental welding is done using a LENS (Laser Engineering Net Shaping) machine. In this study, the LENS machine simply provides a precisely controlled laser heat source and programmable x - y translation table, to accurately laser weld small aluminum parts. Final displacements at certain locations in the welded plate are measured and compared with the predicted distortions from finite element analysis. Strategies for developing improved models for distortion predictions are discussed.