Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第31卷    第7期    总第268期    2021年7月

[PDF全文下载]        [Flash在线阅读]

    

文章编号:1004-0609(2021)-07-1786-12
镁合金载流静轴肩搅拌摩擦焊接数值模拟
陈树君,王 磊,蒋晓青,王奕琳,袁 涛

(北京工业大学 机械工程与应用电子技术学院,北京 100124)

摘 要: 传统镁合金搅拌摩擦焊接过程中材料流动性能较低,从而焊缝容易出现缺陷。本文利用COMSOL仿真软件,建立一种镁合金载流静轴肩搅拌摩擦焊(SSFSW)双热源数值模型,研究输入电流对材料流动性能的影响。通过改变输入电流参数进行数值模拟得到焊接过程温度场,应力场和速度场的演变规律。发现随着电流的提高,温度场分布沿焊缝厚度方向趋于均匀化,焊缝的温度梯度降低,应力场峰值从532 MPa降低至461 MPa,呈明显降低趋势,证明此时焊缝中材料流动性得到显著提高。在电流达到150 A时,焊接温度峰值接近于材料熔点650 ℃,在此温度下易于得到无缺陷的焊缝和性能优异的焊接接头。数值模拟有效地预测实际焊接实验中可能会出现的结果,减少为了得到合理焊接参数所需大量实验的成本,并且仿真结果对工艺参数的选择有重要的指导意义。

 

关键字: AZ31镁合金;载流静轴;肩搅拌摩擦焊;数值模型;温度场;应力场

Numerical simulation of electric assisted stationary shoulder friction stir welding of magnesium alloy
CHEN Shu-jun, WANG Lei, JIANG Xiao-qing, WANG Yi-lin, YUAN Tao

College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China

Abstract:In the traditional magnesium alloy friction stir welding process, the material flow performance is low, so the weld is prone to defects. In this paper, COMSOL simulation software was used to establish a dual heat source numerical model for magnesium alloy current-carrying static shaft shoulder friction stir welding (SSFSW), and the influence of input current on material flow performance was studied. The evolution law of temperature field, stress field and velocity field in welding process was obtained by numerical simulation by changing the input current parameters. The results show that with the increase of the current, the temperature field distribution tends to be homogenized along the direction of the weld thickness, the temperature gradient of the weld decreases, and the peak stress field decrease from 532 MPa to 461 MPa, showing an obvious decreasing trend, which proves that the material liquidity in the weld is significantly improved at this time. When the current reaches 150 A, the peak welding temperature is close to the melting point of the material at 650 ℃. At this temperature, it is easy to get the weld without defect and the welded joint with excellent performance. The numerical simulation can effectively predict the possible results in actual welding experiments, reduces the cost of a large number of experiments in order to obtain reasonable welding parameters, and the simulation results will have important guiding significance for the selection of process parameters.

 

Key words: AZ31B magnesium alloy; electric assisted stationary shoulder friction stir welding; numerical mode; temperature field; stress field

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com