RESISTANCE WELDING METHOD

PURPOSE:To decrease the fluctuation in joining strength even in case of resistance welding of microparts such as electronic parts by executing welding of works dividely in two stages and specifying the respective pressurizing forces and welding currents. CONSTITUTION:The welding of the works 4, 5 is executed by dividing the welding to preliminary joining and normal joining. The pressurizing force at the time of the preliminary joining is set larger than the pressurizing force at the time of the normal welding and the welding current at the time of the preliminary joining is set smaller than the welding current at the time of the normal welding. The joint surfaces of the works 4, 5 are made into the joint surfaces having the stable resistance welding value in this way. Welding of the joint surfaces having the stable contact resistance value by the prescribed welding current is possible at the time of the normal joining. The fluctuation in the joining strength of the microparts such as electronic parts for which high quality is required is, therefore, decreased and the deformation of the joint part is minimized.