薄壁舱体构件电子束焊接变形模拟分析与优化
Simulation analysis and optimization of electron beam welding deformation of thin-walled aero-module
张新瑞 1王晨 1雷正龙 1孙少波 2步贤政 2王志敏2
作者信息
- 1. 哈尔滨工业大学,材料结构精密焊接与连接全国重点实验室,哈尔滨 150001
- 2. 北京航星机器制造有限公司,北京 100013
- 折叠
摘要
大型、多焊缝的薄壁类航天舱体构件在电子束焊接后,存在焊后变形校正难的问题,模拟计算可以预测变形趋势并优化焊接工艺以获得最小变形量.该文对铝合金航天用舱体结构进行了焊接过程的数值模拟,采用平板结构进行了有限元模型的建立与校核,对舱体结构进行了建模,研究了焊接顺序、焊接工艺参数对焊后最大变形量的影响及构件焊后变形趋势.结果表明,构件整体弯曲变形,优先焊接 2 条纵缝会导致较大的变形量,热输入越大,构件焊后变形量越大.在达到 6mm熔深时,采用高焊接速度 35 mm/s及较小的功率 5.4 kW可以获得最小的焊接变形,为 0.35 mm.该文为薄壁大型舱体结构焊接工艺参数优化提供了依据.
Abstract
After electron beam welding,it is difficult to correct deformation of large and multi-weld thin-walled aerospace module components.The simulation calculation can predict deformation trend and optimize welding process to obtain the minimum deformation.Simulation was used to predict deformation trends and optimize welding process to minimize post-weld deformation.The study involved numerical simulation of welding process on an aluminum aeronautical module.After establishing and verifying finite element model using a flat plate structure,aero-module was then modeled.The investigation focused on influence of welding sequence and welding parameters on the maximum deformation after welding,as well as deformation trend of the module.The findings indicated that the module's deformation trend was downward and that prioritizing the welding of the two longitudinal seams led to a larger deformation.And greater heat input resulted in increased post-weld deformation.When adhering to the demand for a 6mm depth of fusion,the minimum welding deformation(0.35 mm)could be achieved by high welding speed(35 mm/s)and low power(5 400 W).The paper aims to provide a basis for optimizing welding parameters for thin-walled,large-scale aero-module structures.
关键词
薄壁舱体/焊接变形/电子束焊接/有限元模拟Key words
thin-walled aero-module/welding deformation/electron beam welding/finite element simulation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据