摘要
为了更深入地探究电子束焊接过程中的机理问题,基于对电子束点焊熔池中液态金属冲刷效应的理论分析,利用边界层理论对该效应进行数学建模.使用有限体积法数值软件Fluent,对20mm厚的2219铝合金电子束点焊熔池的温度场和流场进行三维瞬态数值模拟,研究了液态金属冲刷效应对熔池的作用规律.模拟结果表明,液态金属冲刷效应会对熔池温度场、匙孔稳定性、熔池流场和固液界面形状与位置四个方面产生影响.模拟结果与试验结果吻合良好,验证了数学模型的合理性.
The molten pool behavior of electron beam welding was analysed in order to have a further investigation on the mechanism problems.Based on the theoretical analysis of the the molten pool of electron beam spot welding and boundary layer theory,the flushing effect of liquid metal was mathematically modeled.A three-dimensional transient model was employed to simulate the molten pool in electron beam spot welding based on finite volume method,and the influence of liquid metal flushing effect on temperature field and flow field of molten pool were discussed.The simulation results showed that the liquid metal flushing effect played an important role in temperature field of molten pool,stability of keyhole,flow field of molten pool and position of solid liquid interface.The simulated fusion line of the weld bead follows a good agreement with the experimental result,approving the validation of the mathematical model.
作者
房玉超
杨子酉
何景山
FANG Yuchao;YANG Ziyou;He Jingshan(State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2019年第6期137-142,I0007,共7页
Transactions of The China Welding Institution
关键词
电子束点焊
液态金属冲刷效应
熔池行为
数值模拟
electron beam spot welding
liquid metal flushing effect
molten pool behavior
numerical simulation
