Abstract: In order to improve the durability, high temperature corrosion resistance, and strength of SS316L in industrial applications, Inconel625 was used as a more efficient and expensive covering material. In this paper, SS316L/Inconel625 thin-walled functionally graded materials with a gradient of 5% were prepared by twin-wire double-pulse metal inert gas welding (MIG) and plasma welding. The morphology, microstructure, and properties of the fabricated samples were compared and analyzed. The results show that both deposited samples exhibit good morphology, and no macroscopic defects are observed. The deposition process is stable, and both of the surface roughnesses are less than 4%. Furthermore, scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) analysis show that the microstructure of the deposited samples is columnar crystal and exhibits epitaxial growth. The microcrack is not observed in the 67% SS316L region. The hardness and horizontal tensile properties of two process samples show an increasing tendency from the baseplate to the top, and their average values are approximately the same. These findings show that the samples obtained by two different processes with the same gradient have similar properties and no obvious anisotropy, and the tensile fracture of the two deposited samples shows typical ductile fracture characteristics.