Abstarct: Abstract Nowadays, Severe Plastic Deformation (SPD) processes have attracted significant attention from various industries due to their ability to produce nanostructured ultra-fine-grained components with unique mechanical properties. One of the most important features of this method is the application of extremely high strain without dimensional changes in the product, resulting in components that are high-strength, lightweight, and environmentally friendly. Accumulative Roll Bonding (ARB) is one of the SPD techniques applied to mextal sheets. The ability to join mextal sheets using various mextallurgical and mechanical methods is highly significant for fabricating products such as car bodies, aerospace structures, marine structures, and more. In this thesis, the ARB process was first performed on 1050 aluminum sheets up to three passes, and then the ARB-processed samples were joined together using Resistance Spot Welding (RSP). The RSP parameters, including current levels of 50, 70, and 90 percent of the machine's maximum current and electrode pressures of 2, 4, and 6 bars, were varied, and welding was conducted on as-received (non-ARB) samples and samples processed with 1 to 3 ARB passes. To evaluate weldability, the mechanical properties of the joints were first assessed by performing lap joint strength tests on all samples. The maximum force, displacement to failure, and energy absorbed until failure of the joint were calculated and evaluated. After the samples were separated, the weld nugget geometry—including the major and minor diameters, weld surface area, and electrode penetration depth—was measured and compared for each joint using an Vision Measuring Machine (VMM). The results showed that ARB-processed aluminum samples are weldable using the resistance method. Additionally, the optimal pressure and current parameters for welding were determined for samples subjected to 1 to 3 ARB passes. It was found that as the number of ARB passes increases, the electrode pressure must be increased to achieve a high-quality weld.