Probing thermocapillary convection and multisolute dilution in laser welding of dissimilar miscible metals

Coupled with convection flow, multisolute dilution was investigated by an improved numerical model during laser dissimilar welding of 304 stainless steel and nickel. Thermal behavior firstly studied solidification characteristics were also analyzed. Then, dimensional analysis driving force carried out, the evolution surface tension shear stress quantitatively analyzed for a better understanding mechanism. Finally, species based on model, then compared binary clear illustration. Cooling rate found much larger at SS side, but morphology parameter changed little between different sides. Both relatively this difference decreased time. Surface reached 3390 Pa 2000 side Ni respectively, results in centrally outward Marangoni flow. Multisolute effect considered, distribution all main elements obtained one time high efficiency. Simulated result from showed great correspondence EDS observation. The fundamental conclusions work provided valuable insight into heat mass transfer process additive manufacturing.