[en] Highlights: • The wettability of the braze filler on the base material is increased significantly by providing a Ni coating. • Bare AISI 321 base metal possess moderate wettability due to the presence of Mn alloying element. • Ni coating helps in improving the joint shear strength and also minimizes the interganular attack by braze metal. • Effect of varying brazing parameters (temperature, time and filler thickness) are addressed in this study. • The solidified braze metal comprises of a Cu-rich solid solution (α_p and α_e phases) and an Ag-rich solid solution. In this study, a Cu-37.5Ag-8Mn-5Zn braze filler with a liquidus temperature of 810 °C was used for brazing of Martensitic Stainless Steel (MSS) to AISI 321 Austenitic Stainless Steel (ASS). By providing a layer of Ni coating (5 μm) over the base materials, satisfactory wetting and spreading of the braze filler was achieved. Brazing experiments were carried out at different temperatures (835 °C to 935 °C) for different times (5 to 25 min) employing braze foils of different thicknesses (75 μm to 300 μm) to arrive at the optimum brazing conditions. The joints brazed at 910 °C for 15 min using a braze foil of 150 μm thickness showed the highest lap-shear strength of 213 MPa. The microstructure of braze metal consisted of Cu- and Ag-rich solid solution phases with varying amount of Ag/Cu, Mn, Zn, and Ni. The Ni coating was found to minimize the intergranular penetration of the braze metal into the base materials. The changes in tensile properties of the base materials after the brazing thermal cycle were also discussed.