Abstract: The invention relates to a resistance welding process for welding metal parts together. To improve the quality of the weld, at least one welding electrode (4) is embodied as a circular cylinder, which is seated so that it rotates around its cylinder axis. In accordance with the invention, the welding electrode (4) in the shape of a circular cylinder is caused to rotate at least during the welding of the metal parts (1, 2), so that by means of creating a sliding friction between the surface area of the welding electrode (4) and the surface of the metal part (2) resting against it the surface of the latter is freed of possible impurities. The process is particularly well suited for welding sand-blasted molybdenum foils and tungsten wires together.