Diffusion bonding method is an alternate method to join similar and dissimilar materials with minimum dimensional tolerance. It is one of solid state process in which two metallic surfaces are made to contact at the elevated temperature and pressure. Diffusion bonding process provides elevated quality joints without post weld machining. The main process parameters of diffusion bonding include temperature, pressure and holding time. In diffusion bonding technique microstructural changes were fashioned in the base metal which determines the mechanical properties of the bond at the boundary. Diffusion bonding method can be used to weld the dissimilar materials with different chemical and mechanical properties. The present work determines the control of process parameters on diffusion bonded joints of AISI 304 stainless steel plates. Experimental investigation on the microhardness, lap shear test were made for diffusion bonded couples and outcome are summarized.