Abstract—Resistance spot welding is widely used in the automobile, ship, and food industries. The durability and safety of the product being produced from these different industries depend on the spot welding joint’s connection quality, which makes it very important. However, there are a lot of poor quality resistance spot welding connections and this is caused by several factors, namely: material preparation, welding time, welding current, electrode pressure applied during welding, and post-welding treatment. This research was conducted to analyze how changing the joint surface’s roughness before welding and current parameters during welding could improve the quality of resistance spot welding joints. The experiments were conducted using a stainless steel plate material 304 with a size of 175x25 mm. Furthermore, mechanical testing was carried out the tensile shear and macrostructure using the Gwyddion software. The results showed that the parameters of the welding current, significantly affect the width of the welding nuggets and the quality of the spot welding resistance joint is improved by even the slightest roughness variation on the joint surface.