6061-T6铝合金高速搅拌摩擦焊数值模拟  

Numerical Simulation on High Speed Friction Stir Welding of 6061-T6 Aluminum Alloy

作　　者：朱墨 武凯[1] 贾贺鹏 孙宇[1] ZHU Mo;WU Kai;JIA Hepeng;SUN Yu(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《热加工工艺》2024年第17期27-32,共6页Hot Working Technology

基　　金：江苏省科技成果转化专项项目(BA2019029);苏州市重点研发产业化重点项目(SGCC201914)。

摘　　要：基于耦合欧拉-拉格朗日方法,建立了6061-T6铝合金薄板的高速搅拌摩擦焊数值模型,研究高速焊接工艺条件下的温度场及变形场特点,采用示踪粒子方法研究焊接区材料塑性流动规律。开展高速搅拌摩擦焊试验,分别从温度场、宏观样貌和内部缺陷对数值模型进行验证。结果表明,采用该模型能够准确描述高速搅拌摩擦焊过程的温度场及变形场,也能精准预测焊接缺陷出现的位置及尺寸。相较于常规搅拌摩擦焊,高速搅拌摩擦焊在焊接方向和横截面都具有更密集的温度梯度,塑性应变区域也较为集中,其热影响区更小。Based on the Coupled Eulerian Lagrangian(CEL)method,the numerical model of high speed friction stir welding of 6061 aluminum alloy sheet was established,and the characteristics of temperature field and deformation field under high speed welding process were studied,and the plastic flow law of the material in welding zone was studied by using tracer particle method.High speed friction stir welding experiments were carried out to verify the numerical model from the temperature field,macroscopic appearance and internal defects.The results show that the application of the model can accurately describe the temperature field and deformation field during high speed friction stir welding,and it can also accurately predict the location and size of welding defects.Compared with conventional friction stir welding,high speed friction stir welding has a denser temperature gradient in the welding direction and cross-section,and the plastic strain area is more concentrated,and its heat affected zone is smaller.

关 键 词：高速搅拌摩擦焊 温度场 变形场 示踪粒子 数值模拟 

分 类 号：TG453.9[金属学及工艺—焊接]