Formability of laser welded steel/magnesium dissimilar metal with Sn powder-adhesive interlayer

Abstract The exploratory experiments of laser fusion welding with Sn powder and the automotive adhesive addition were conducted for DP590 dual-phase steel AZ31B magnesium alloy in an overlap steel-on-magnesium configuration. characteristics metal vapor/plasma analyzed by collecting analyzing plasma shape spectra. microstructure welded was characterized scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS). temperature field distribution joint simulated COMSOL finite-element software. results showed that transfer heat from to is hindered layer, which conducive simultaneous melting large differences boiling points. In addition, width molten pool increases, but depth shallow on side. Meanwhile, recoil pressure induced splashing reduces, surface quality weld improved. Some intermetallic compounds (IMCs), such as FeSn, Fe 1.3 Sn, 3 are formed inside pool, while columnar dendrite Mg 2 phase also produced. presence these phases helps realize bidirectional metallurgical bonding steel/magnesium dissimilar metals.