This work aims to weld 7075 Aluminum alloy by ATIG welding using ER4043 filler metal and to investigate the effect of adding  Nanoparticles to coating on microstructural and mechanical properties of welds. For this purpose, the Nanoparticles were first coated on the samples using a brush, and then the gas tungsten arc welding process was performed using the appropriate welding parameters on the samples. Microstructural and mechanical evaluations were performed on the samples. Microstructural studies revealed that the presence of Nanoparticles in the heat-affected zone reduced grain size and modified the microstructure. hardness test on gas tungsten arc welding joints specimens found that in the melting zone, the hardness in this area was reduced by approximately 20% compared to the base metal due to the coarse grain size and the Casting structure. Based on the results of the tensile test, it was observed that microstructural changes reduced tensile strength and yield strength for the welded sample compared to the base metal. The use of Nanoparticles increased the hardness in this area to approximately 120 HV. Also, the presence of Nanoparticles conforming to the strengthening mechanisms of Nanoparticles increased the tensile strength to 300MPa. According to the results of this study, the presence of Nanoparticles in the coating improves the welding properties of 7075 Aluminum alloy.