2024铝合金控冷搅拌摩擦焊温度场数值模拟研究

Numerical simulation of temperature field of control-cooling friction stir welding for 2024 aluminium alloy

基于Morfeo有限元分析平台,采用热流耦合、热力耦合相结合的方法,对空冷和水冷条件下2024铝合金搅拌摩擦焊初始阶段和稳定阶段的温度场分布、特征点焊接热循环进行了数值模拟,并对模拟结果进行了实验验证。结果表明:温度场高温区域均出现在搅拌工具轴肩下方的位置,且在搅拌工具后侧位置温度最高;空冷时各特征点焊接热循环的升温速率稍高于水冷的升温速率,而降温速率远远低于水冷时的速率。实际测试的焊接热循环与模拟预测值吻合较好。

Based on FEA software of Morfeo, the temperature distribution and weld thermal cycles of the friction stir welding （FSW） joints qf 2024 aluminium alloy are simulated under air and water cooling conditions using the method of thermal-fluent and thermal-mechanical coulping. The results show that the high-temperature zones are located at the interface between the shoulder of the stir tool and the top surface ofworkpiece. Moreover, the temperature at the back of the stir tool is higher than that at the front. The heating rate of the case in air welding is slightly faster than that in water welding, while the cooling rate in air welding is much lower than that in water welding. The experimental values involved in the weld thermal cycles coincide with the calculated results.