异质铝合金激光深熔焊热固耦合数值模拟研究
Numerical Simulation of the Couple of Thermal and Stress in Deep Penetration Laser Welding of Heterogeneous Aluminum Alloys
吴雁 1叶佳庆 2孙国锋 2李朝阳 2刘旭辉2
作者信息
- 1. 上海应用技术大学机械工程学院,上海 201418;上海物理气相沉积(PVD)超硬涂层及装备工程技术研究中心,上海 201418
- 2. 上海应用技术大学机械工程学院,上海 201418
- 折叠
摘要
为提高车用动力电池极耳焊接质量,基于ANSYS仿真平台建立1050/6061异质铝合金薄板非线性瞬态热固耦合分析模型,通过APDL语言完成高斯面热源的移动加载.模拟在给定工艺参数下激光深熔焊温度场与应力场,并将模拟结果与试验结果对比分析.结果表明,模拟的熔池形状和大小与试验结果吻合良好,具有可靠性.激光束加热和冷却速度极快,热源附近温度梯度大,等温线密集.焊缝中心处的应力集中是导致焊接接头产生细微裂纹等缺陷的主要原因,焊后有必要通过退火处理来降低等效残余应力.
Abstract
To enhance the welding quality of vehicle power battery pole ears,a nonlinear transient thermo-structural coupling analysis model was developed for 1050/6061 heterogeneous aluminum alloy sheets using the ANSYS simulation platform.The Gaussian surface heat source was applied using APDL language,and the temperature and stress fields of laser deep penetration welding were simulated under specified process parameters.The simulated molten pool shape and size were compared with ex-perimental results,showing good agreement and reliability.The rapid heating and cooling of the laser beam resulted in a large temperature gradient near the heat source and dense isotherms.Stress concentration at the weld center was identified as the main cause of small cracks and other defects in the welded joint,suggesting the need for annealing treatment to reduce equiva-lent residual stress after welding.
关键词
异质铝合金/激光深熔焊/热固耦合/温度场/应力场Key words
heterogeneous aluminum alloy/deep penetration laser welding/thermo-structural coupling/temperature field/stress field引用本文复制引用
基金项目
上海市科委地方院校能力建设项目(20090503000)
上海市科委科技型中小企业技术创新资质项目(220H1131900)
出版年
2024
NETL
NSTL
万方数据