Porosity is known as the main problem of aluminum alloys regardless of the method for formation of aluminum components due to the unique thermophysical properties of this metal. The larger the heat input is, the higher the likelihood is of formation of pores within the structure of the components, whether be they caused by the gas adsorption or due to the expansion and then shrinkage of the material during the heating/cooling cycle. Since the pore formation mechanisms of additively manufactured specimens is still unclear, during the present work a wire arc additively manufactured specimen was used in order to study the concentration of pores within the structure of the last along its volume. Additionally, the less studied cold arc pulse (CAP) mode was employed during the specimens manufacturing. Since the structure directly influences the mechanical properties of the components, a microhardness map was prepared as well as investigation of the microhardness as a function of the specimen’s height. The results were summarized and indicated an increasing trend of the porosity of the specimen towards its top section. The larger defects were observed closer towards the bottom of the specimen due to the lower interpass temperature, this the worse fusion of the aluminum. Despite this the microhardness along the face-wall of the specimen and its cross section remained the same within the margin of error. The possibility of decreasing the porosity and increasing the quality of the deposited components was discussed.