METALLIC BELLOWS STRUCTURE, ITS MANUFACTURING DEVICE AND ITS WELDING METHOD, ACCUMULATOR AND ITS ASSEMBLING METHOD

PROBLEM TO BE SOLVED: To simply and surely join by forming the combined part resistance welded at least one side end of a cylinder-like or discoid metallic bellows and a metallic parts into a loop shape as a line-like or band-like weld zone. SOLUTION: With regard to the relation between the inner diameter of the metallic bellows 1 and the outer diameter of the metallic parts 3, the inner diameter of the metallic bellows 1 is set to be slightly smaller, and the metallic parts is forced into the metallic bellows under the state that the inner diameter of the metallic bellows 1 generates elastic elongation at the time of forcing. The metallic bellows 1 and the metallic parts 3 are fixed to a welding machine, the electrode using as a fixing chuck 6 is formed into the shape such as e.g. a conical chuck and made of a copper alloy so as not to cause any trouble in the case of feeding an electric current. Also, since the chuck 6 rotates automatically, the weld point is allowed to transfer. After chucking the metallic parts 3, four discoid electrodes 7a, 7c or the like are pressed on the weld zone from surrounding four directions under the prescribed pressure. These four electrodes are made to mutually maintain the positional relation of 90 deg..