中文摘要：

搅拌摩擦焊接过程中的材料塑性变形流场与温度场对焊接接头的组织演化及最终的力学性能有着十分重要的影响，许多学者对此进行了大量的研究．近年来的研究结果表明，该过程是一个极其复杂的热力耦合过程，温度场与材料塑性变形流场之间具有相互耦合效应．运用流体力学和传热学原理对准稳态热力耦合过程进行了数值模拟研究，通过计算得到了焊件材料的流场和温度场分布，并设计了相关实验对温度场进行了验证，结果表明该计算结果可以较准确地描述搅拌摩擦焊准稳态热力耦合状态．

英文摘要：

The flow field of plastic deformation and the temperature field during the process of friction stir welding can directly affect the structure evolution of the welded joint, and also have a great influence on mechanical properties of the final joint. In this respect, therfore, a lot of researches have been carried out. The recent research results show that this process is an extremely complex coupled thermal-mechanical process, the temperature field couples together with the flow field of plastic deformation of the material. In this paper, the coupled process is simulated based on hydromechanics and heat transfer theory; the flow field of plastic deformation and the temperature field are calculated; an experiment is designed to measure the temperature field, which indicates that the computed results can exactly describe the coupled thermal-mechanical condition of the friction stir welding in quasi-steady-state.