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

【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 B_y in workpiece and arc area is calculated,and the influence of excitation current and air-gap distance on the distribution of transverse magnetic field B_y 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.更多还原

【Abstract】 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 B_y in workpiece and arc area is calculated,and the influence of excitation current and air-gap distance on the distribution of transverse magnetic field B_y 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.更多还原