Aluminum7075 Aluminum welding by tungsten-gas arc method using electrodes containingnanoparticles and reviewing aging treatment on microstructure and mechanicalproperties. Thepurpose of this research was to investigate aluminum alloy 7075 welding in T6mode using arc welding of tungsten gas using filler-containing metalnanoparticles and investigating the effect of aging and microstructureevaluation and mechanical properties of the welds. For this purpose, twodifferent filler metals of 4043 ER and 5356 ER were used for arc welding oftungsten gas. Nanoparticles of TiO2 were introduced into the pond by thecoating method on the filler metal. After the welding process, a number ofsamples were used for aging at 140 ° C and 10 hours. In order to evaluate themicrostructure of the optical microscope, a scanning electron microscopeequipped with an elemental analysis system was used. Microstructural,cross-sectional and shear stress tests were used to evaluate mechanicalproperties. Microstructural investigations revealed that the size of the grainsin the boiling region of nanoparticulate welded samples using both reducedfiller metals and aging operations caused a significant change in the formationof sediments and their distribution in the boiling region. Also,microstructural studies showed that grain size in welding using filler material4043 was lower than that of welding with filler metal 5356. Microstructure teston the samples connected to arc welding of tungsten gas revealed that in thearea of ??fuziun , due to the grinding of the grain size and the existence of ahardening structure, it was reduced with both filler metals. It was alsoobserved that the use of nanoparticles as well as aging operations increasedthe difficulty in this area. Based on the results of tensile test and shearstress tests, the microstructural changes reduced the tensile strength andyield strength for the welded sample compared to the base metal. The use ofnanoparticles as well as aging operations increased the strength of the area.According to the results of this study, the connection of gas tungsten weldingusing nanoparticle-coated metal filler 5356 in aged conditions has the bestmicrostructural and mechanical properties. keywords Aluminum7075, reinforcement, coating, arc welding of tungsten gas, aging treatment