Numerical analysis of external magnetic field for mitigating backward flow momentum in weld pool  

作　　者：李琰 武传松 高进强 

机构地区：[1]Key Laboratory for Liquid-Solid Structure Evolution and Materials Processing (Ministry ofEducation), and Institute for Materials Joining, Shandong University, Jinan, 250061

出　　处：《China Welding》2014年第3期9-15,共7页中国焊接（英文版）

基　　金：The authors are grateful to the financial support for this research from the National Natural Science Foundation of China （ Grant No. 51275276） and the Research Fund for the Doctoral Program of Higher Education of China （ Grant No. 20120131130009）.

摘　　要：The external magnetic field is applied to mitigating backward flow jet of molten metal in weld pool so that humping bead may be suppressed during high speed gas metal arc welding（GMAW）. Therefore, the external magnetic field distribution in workpiece is critical to understand the interaction mechanisms of the external magnetic field with molten metal flow. In this study, the steady state external magnetic field induced by excitation device is numerically analyzed by using the the finite element software ANSYS and the three dimensional static magnetic scalar method. The distribution of external transverse magnetic field By in workpiece and arc area is calculated, and the influence of excitation current and air-gap distance on the distribution of transverse magnetic field By has been discussed. The magnetic field distribution in workpiece is measured by using a Tesla-Meter and compared with the simulated result. It is found that both are in good agreement.The external magnetic field is applied to mitigating backward flow jet of molten metal in weld pool so that humping bead may be suppressed during high speed gas metal arc welding（GMAW）. Therefore, the external magnetic field distribution in workpiece is critical to understand the interaction mechanisms of the external magnetic field with molten metal flow. In this study, the steady state external magnetic field induced by excitation device is numerically analyzed by using the the finite element software ANSYS and the three dimensional static magnetic scalar method. The distribution of external transverse magnetic field By in workpiece and arc area is calculated, and the influence of excitation current and air-gap distance on the distribution of transverse magnetic field By has been discussed. The magnetic field distribution in workpiece is measured by using a Tesla-Meter and compared with the simulated result. It is found that both are in good agreement.

关 键 词：external magnetic field numerical analysis high-speed GMAW molten flow mitigation 

分 类 号：TM311[电气工程—电机] O241[理学—计算数学]