In Cold Spray Additive Manufacturing (CSAM), the 'tamping effect'—resulting from continuous impact of incoming particles enhances the mechanical properties of deposited layers. While the impact of tamping on porosity is well-studied, its influence on inter-splat bonding remains unexplored. In this study a multiparticle simulation based on Finite Element Analysis (FEA) is employed, featuring 120 particles distributed across 12 layers to model the deposition process in cold spray. A methodology is developed to discern the effect of tamping, enabling the estimation of particle boundary temperatures under conditions with and without tamping. Energy analysis and inter-splat boundary temperature variations obtained from simulations are examined to understand the contribution of tamping to bonding. Our findings reveal a significant increase in inter-splat boundary temperatures, attributed to energy transfer from overlying layers, positively impacting bonding. The proposed hypothesis is substantiated through mechanical testing and the assessment of inter-splat bonding-related properties, including hardness, tensile strength, scratch resistance, and corrosion resistance, as a function of deposit thickness. CSAM IN718 and Cu deposits with a thickness of 4 mm are used as subjects for this study.