Abstract: Considering the significant differences in the physical and chemical properties of aluminum and iron, the poor weldability of conventional welding methods, and the low joint strength, this study analyzes the effects of various collision speeds and angles on the interface behavior and product distribution in vaporization foil actuator welding of 3003 aluminum alloy and 0Cr18Ni10Ti stainless steel through a combination of numerical simulation and experimental research. The SPH method is employed to analyze the interface behavior and temperature distribution during the vaporization foil actuator welding process, and the influence of various process parameters on the interface waveform characteristics is examined. The conditions for the generation of interface jets and the formation mechanism of interface characteristics are determined, and the changing trends of interface waveform characteristics and the distribution characteristics of interface products under different process conditions are compared. The numerical simulation and experimental results are highly significant for the engineering application of vaporization foil actuator welding in dissimilar metal materials.