Patent ID: 6268581
Filing Date: 2001-07-31
Classification: B23K

Abstract:
A seam welding machine comprising:circular electrodes for applying pressure to an overlapping portion where edges of members being welded overlap and welding said overlapping portion by imparting an electric current thereto while moving; anda circular electrode pressure cylinder for generating a force for pressing said circular electrodes against said overlapping portion of said members being welded,said circular electrode pressure cylinder having:a plurality of pistons, wherein each of said pistons is capable of operating separately and the plurality of pistons are disposed in series along the direction of pressure applied to said circular electrodes so as to contact each other; anda plurality of cylinder portions for housing said pistons,the pressure output of said circular electrode pressure cylinder being capable of being set in a plurality of stages by allowing pistons in the end away from said circular electrodes to contact said pistons in the near end appropriately so as to be operate together and adding together the pressure output of each of said pistons.