搅拌摩擦焊接中的接触界面材料行为分析  

Analysis of material behaviors on contact interface in friction stir welding

作　　者：张昭[1] 陈金涛[1] 刘亚丽[1] 张洪武[1] 

机构地区：[1]大连理工大学工程力学系,工业装备结构分析国家重点实验室,大连116024

出　　处：《塑性工程学报》2011年第3期111-114,共4页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(10802017);国家重点基础研究发展计划(973计划)资助项目(2010CB832704)

摘　　要：通过有限元模型,模拟不同工况下的搅拌摩擦焊接过程发现,焊接构件的中下部搅拌针,与焊接构件接触面上材料流动的速度以及厚度方向上的位置无关,但是靠近上表面的材料流动速度明显增加,而且靠近上表面的材料流动速度与厚度方向上的坐标均呈近似的线性关系。搅拌头轴肩下方的区域是材料流动的主要区域,在轴肩外边缘区域,材料流动速度迅速降低。焊接温度和材料流动速度随搅拌头转速的增加而增加,滑动系数随搅拌头转速的增加而增加。预热时间的变化,对无缺陷搅拌摩擦焊接过程的影响较小。Friction stir welding process was simulated in different cases.There is no relation between the flow velocities of the materials near the bottom surface and the positions of material particles in the thickness direction.But the material near the top surface can be affected by the movement of the shoulder.A linear relation can be found between the flow velocity and the coordinate in the thickness direction near the top surface.The material flows mainly occur under the shoulder.Near the border of the shoulder,the material flow velocity is obviously decreased.The temperature and flow velocity are increased with the increase of the angular velocity of welding tool,as well as the slipping coefficient.The effect of preheating time on defect-free friction stir welding is very small.

关 键 词：搅拌摩擦焊接 有限元模型 材料流动 

分 类 号：TG402[金属学及工艺—焊接]