Screw can all form a complete set of production equipment, automatic welding production line and water roll kaiping shear plate, arc, forming, welding sequence, and USES the gas shielded welding, stable product quality, reasonable by force, beautiful appearance, safe and reliable performance. Eliminated due to the traditional production process quality problem, can not only improve the quality of the oil tank, and shortened the manufacturing period, is the largest oil companies designated production factory.