铝合金搅拌摩擦焊温度场数值模拟及参数影响分析  

Numerical Simulation of Temperature Field and Parameter Influence Analysis of Friction Stir Welding of Aluminum Alloy

作　　者：周文静 杜柏松[1] 卢小明 ZHOU Wenjing;DU Baisong;LU Xiaoming(School of Architecture and Construction,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074

出　　处：《热加工工艺》2021年第7期156-160,共5页Hot Working Technology

基　　金：重庆交通大学研究生创新项目(2018S0122)。

摘　　要：对10 mm厚6061-T6铝合金,应用有限元软件COMSOL建立了搅拌摩擦焊有限元模型,模拟搅拌摩擦焊稳态温度场并分析焊速、转速变化对温度场影响。结果表明:温度分布曲线在x、y方向呈非对称的M型,返回侧峰值温度比前进侧峰值温度低约10℃,搅拌头后侧峰值温度比搅拌头前侧峰值温度高约25℃;焊接速度越大,峰值温度差值越大,转速越大,峰值温度差值也越大。焊接速度不变,转速等值增加时,x、y方向温度分布曲线等值上移,具有一定的平行性和相似性。转速不变,焊接速度等值增加时,x、y方向温度分布曲线以越来越小值下移。与转速相比,焊接速度改变对椭圆形的热影响区改变大,对椭圆率改变明显,对温度场影响显著。For the 6061-T6 aluminum alloy with a thickness of 10 mm, the finite element model of friction stir welding was established by the finite element software COMSOL, the steady temperature field was simulated and the influence of welding speed and rotation speed on the temperature field was analyzed. The results show that the temperature distribution curve presents an asymmetric M shape in the x and y directions, the peak temperature on the return side is about 10℃ lower than that on the forward side, and the peak temperature on the back side of the stirring head is about 25℃higher than that on the front of the stirring head. The larger the welding speed is, the larger the peak temperature difference is, and the larger the rotation speed is, the larger the peak temperature difference is. When the welding speed remains unchanged and the rotation speed equivalently increases, the equivalent value of the temperature distribution curve in the x and y directions moves up,showing certain parallelism and similarity. When the rotation speed remains unchanged and the welding speed equivalent increases, the temperature distribution curve in the direction of x and y moves down with smaller and smaller values.Compared with the rotation speed, the change of welding speed has a significant effect on the elliptic heat affected zone, the elliptic rate change obviously, which has significant effect on the temperature field.

关 键 词：搅拌摩擦焊 温度场 参数改变 峰值温度 温度分布曲线 

分 类 号：TG457.14[金属学及工艺—焊接]