This research explores the impact of cooling time on the distribution of alloying elements within weld metals of high-strength steel, a critical factor in optimizing welding processes for advanced structural applications. Using gas metal arc welding (GMAW) and two different filler materials, this study systematically varies cooling times to analyze the resulting chemical compositions. Energy Dispersive X-ray (EDX) analysis was employed to examine the alloy content in the weld metal, base material, and heat-affected zone (HAZ). The results demonstrate that cooling time significantly influences the concentration of alloying elements, such as chromium, nickel, and manganese, within the weld metal, revealing complex diffusion behaviours that are dependent on the thermal cycles introduced during welding. Notably, an in-depth analysis of the HAZ shows a distinct diffusion pattern for silicon, indicating intricate microstructural changes. These findings highlight the importance of controlling cooling time to optimize the microstructural and chemical properties of welded joints in high-strength steels, with implications for improving weld performance and reliability.