Effect of axial magnetic field in the laser beam welding of stainless steel to aluminum alloy

摘要

External magnetic field has been favored in the welding, due to the beneficial effects on the weld pool dynamics. The overlapping welding in a keyhole mode with a magnetic field perpendicular to the welding direction was carried out between stainless steel 301 and aluminumalloy 5754 in this study. The results indicated that the application of the magnetic field can modify the weld bead appearance and microstructure of the weld by the Lorenz force and thermoelectric magnetic force induced in the molten pool. Furthermore, the reaction area between steel/Al decreased due to the diffusion of the Al atoms was suppressed, consequently reducing the microhardness and then strengthening the transverse tensile force by 54.6% from 1.81 kN to 2.91 kN. (C) 2016 Elsevier Ltd. All rights reserved.