文献类型：会议论文

中文题名：Laser Welding of Lightweight Structures: Finite Element Modeling of a Thin Aluminum Plate

作者：Yuansheng An;Cumali Semetay;Herman F. Nied

机构：[1]School of Mechanical and Power Engineering, East China University of Science and Technology, China,;[2]Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, PA 18015, USA, 1(6;

会议论文集：结构、材料与环境健康监测国际会议（International Conference on Healt

会议日期：20071016

会议地点：南京

主办单位：东南大学

语种：英文

中文关键词：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.