The paper theoretically considers aspects of aluminum welding, including specific challenges that arise when welding this metal. Aluminum, known for its lightness and corrosion resistance, presents particular difficulties during welding due to its high thermal conductivity, tendency to form an oxide layer, and porosity in the welded joints. These difficulties can affect the quality of the welds and require special techniques and settings for efficient welding. The role of helium as a shielding gas in the welding process is also discussed. Helium, as a shielding gas, plays a significant role due to its unique properties that can significantly improve the quality of welds when working with aluminum. The use of helium can result in increased heat input, leading to deeper penetration and a wider weld. The AC MIG (Alternating Current Metal Inert Gas) method of aluminum welding is explored, which allows for better heat input management and reduction of oxide formation thanks to the alternating current flow. This method helps overcome some of the fundamental challenges of welding aluminum, providing cleaner and higher-quality welds. In the experimental part of this work, build-up welding using aluminum 5083, known for its good weldability and corrosion resistance, is demonstrated. The experiment detailed how various welding parameters, such as EN ratio and the proportion of helium in the shielding gas, affect the quality and geometry of the build-up. After build-up welding, macro sections were prepared on which the geometry of the build-up was analyzed depending on the EN ratio and the proportion of helium in the shielding gas. The results show how significantly the EN ratio affects the geometry of the build-up, and how the proportion of helium increases penetration and reduces the impact of EN ratio.