旋转速度对静止轴肩搅拌摩擦焊温度场和应力场的影响  

Effect of Rotational Velocity on Temperature and Residual Stress Field by Stationary Shoulder Friction Stir Welding

作　　者：贺巍亮 王伟[1] 李华芳[1] 李晓燕 HE Weiliang;WANG Wei;LI Huafang;LI Xiaoyan(Dept.of Aeronautical Engineering,Shaanxi Polytechnic Inst.,Xianyang 712000,China;Xi'an Zhonghui Zhuoyue Education and Technology Co.,Ltd.,Xi'an 710000,China)

机构地区：[1]陕西工业职业技术学院航空工程学院,陕西咸阳712000 [2]西安中汇卓越教育科技有限公司,陕西西安710061

出　　处：《电焊机》2024年第1期86-94,共9页Electric Welding Machine

基　　金：陕西工业职业技术学院自然科学类一般项目(2023YKYB-007);陕西省创新能力支撑计划资助(2023KJXX-079)。

摘　　要：针对3 mm厚的2024-T4铝合金,采用ABAQUS软件建立静止轴肩搅拌摩擦焊热源三维模型,分析2024-T4铝合金静止轴肩搅拌摩擦焊温度场和应力场的有限元模拟,研究了恒定150 mm/min焊接速度下,旋转速度从800 mm/min到1 200 mm/min对焊接接头残余应力的影响。结果表明:常规搅拌摩擦焊焊缝横截面高温区域呈现碗状分布,而静止轴肩搅拌摩擦焊呈类似于搅拌针形貌分布。相比于常规搅拌摩擦焊,静止轴肩可以获得更窄的搅拌区宽度,并且有效降低焊缝中心的峰值温度。焊后垂直于焊缝区域的纵向残余应力呈现“M”形分布,随着搅拌头旋转速度的增大,两种工艺下的焊后残余应力均增大。此外,静止轴肩在焊接过程中对焊缝区域持续碾压,使得焊后试样的纵向残余应力峰值相比较于传统搅拌摩擦焊能降低45.6%。Based on 3 mm thickness 2024-T4 Alloys,the three-dimensional model for heat source of stationary shoulder friction stir welding is established by using numerical simulation software ABAQUS.The temperature and residual stress field distributions of stationary shoulder friction stir welding of 2024-T4 is analyzed,and the effects of rotational velocities ranging from 800 mm/min to 1200 mm/min on residual stress were investigated in detail.The results show that the high temperature region of the cross-section appeared to be a bowl-shaped distribution,and the shape for the stationary shoulder friction stir welding was similar to the rotating pin.Stationary shoulder friction stir welding was beneficial to decreasing the peak temperature of stir zone and then obtaining a narrower area compared with conventional shoulder.The shape of the longitudinal residual stress in section perpendicular to the weld presented“M”after welding.The residual stress increased with the increase of rotational velocity under different processes.The stationary shoulder provided synchronous rolling during welding,which reduced 45.6%peak residual stress.

关 键 词：2024-T4铝合金 静止轴肩搅拌摩擦焊 旋转速度 残余应力 

分 类 号：TG402[金属学及工艺—焊接]