摘要
用数值模拟的方法解释了大功率激光高速焊接时熔池呈窄而长形状的形成原因。在PHOENICS 3.4软件中建立了激光焊接的三维数学模型,假设小孔呈GAUSS曲面体形状,并在其上加载反蒸发力,重点考虑反蒸发力对熔池形状的影响,模拟了SUS304不锈钢在激光功率10kW、焊速为4～20m/min时的熔池的温度场和流场。计算结果表明,大功率激光高速焊接时喷发的等离子体加速了"匙孔"附近液态金属的流动,是大功率激光焊时产生长熔池现象的主要原因。
A mathematical model was developed to describe the moving laser welding by using the rotary Gauss body heat source model and taking the effect of recoil pressure into account.Numerical simulation was conducted by PHOENICS 3.4 software.The mathematical mode explains formation of the long-narrow pool in high power laser welding (Laser power:10 kW,Welding speed:4 -20 rn/min).The results show that the plasma accelerates the velocity of liquid metal around the keyhole at high welding speed,and it is the main reason for the formation of the long-narrow pool in high power laser welding.
出处
《焊接》
北大核心
2009年第10期29-33,共5页
Welding & Joining
基金
广东省教育部产学研资助项目(2009B090300250)
甘肃省自然科学基金资助(0710RJZA064)
关键词
大功率激光焊
小孔
反蒸发力
high power laser welding
keyhole
recoil pressure
