Abstract: Using argon tungsten arc welding the technology research and manufacture was carried out for three-layer bellows with the diameter of 350 mm or 230 mm. The theory rigidity and fatigue intensity of welded bellows were experimently confirmed, the reasonable welding parameters was selected, and three-layer welded bellows with the diameter of 350 mm or 230 mm were manufactured. Quality of welded bellows accords with techniques standard.