The article presents the results of studies of capacitor welding of WS-M8–30 studs made of 1010 to ASME SA-516 Gr 70 steel with a thickness of 4 mm for the installation of a vibration floor in a cement tanker. The equipment used by European manufacturers does not regulate the static pressing force, and there are no digital values of the welding mode parameters (current, voltage) on the control panel, which makes it difficult to optimize the parameters of thermal force action during capacitor welding in production conditions. The parameters of welding modes were recorded by contactless sensors: current flow time and its amplitude, voltage during welding in the permissible range for a given stud diameter, temperature. The results of mechanical tear tests allowed us to establish the optimal mode for welding studs: welding current 497 A with a flow time of 380 ms and a static force pressing the stud to the sheet of 120 N. Metallographic analysis revealed the most frequently occurring defects in welded joints. The causes are described, and recommendations are given to reduce the likelihood of their occurrence. The causes of changes in hardness in the base metal, weld-affected zone, and welded joint are described.