Longitudinal: straight seam steel is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction. For the transport of liquids: water supply, drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: as piling pipe, for bridges; piers, roads, buildings and other structures tube. Molding process: large diameter welded pipe major production processes: 1. Board: being used to manufacture large diameter submerged arc welding straight seam steel pipe into the production line, the first full-plate ultrasonic testing; 2. Milling: The milling machine the two-sided edge steel milling, so as to meet the requirements of the plate width, plate edge parallelism and groove shape; 3. Pre-curved edges: the use of pre-bending machine plate edge pre-bending, the plate has to meet the requirements of the curvature of the edge ; 4. Molding: Molding Machine On JCO first half pre-bent steel plate after stepping through several punching, pressed into a "J" shape, the other half and then the steel sheet of the same bent, pressed into a "C" shape, and finally the formation the opening "O" ring 5. Pre-welding: make straight seam welded steel pipe seam after forming and using gas welding (MAG) welding continuously; 6. internal welding: The tandem multi-wire submerged arc welding (up to four-wire) in the medial straight seam welded steel pipe; 7. Welded: The tandem multi-wire submerged arc welding on the outside of LSAW steel pipe welding; The ultrasonic inspection Ⅰ: inside and outside of the straight seam welded steel pipe and weld on both sides of the weld base metal 100% inspection; 9. X-ray examination Ⅰ: inside and outside welds 100% X-ray television industry inspection using image processing system to ensure the detection sensitivity; 10. expanding: for SAW straight seam steel pipe is expanded in diameter to increase the entire length of the dimensional accuracy of the steel pipe, and to improve the distribution of internal stress of the steel pipe; 11. The hydrostatic test: On pressure testing machine after expanding the steel pipe by-root test to ensure Pipe test pressure requirements of the standard, the machine has an automatic recording and storage capabilities; 12. chamfer: The steel pipe inspection conducted after the end of the process, to meet the requirements of the pipe end beveling size; 13. Ultrasonic Inspection Ⅱ: again by Root ultrasonic testing to check in straight seam welded steel pipe flaring may occur after the water pressure deficiencies; 14. X-ray examination Ⅱ: expanding steel pipe after hydrostatic test and X-ray television industry inspection and pipe end welds film; 15. Magnetic particle inspection pipe ends: this check is to find defects in the pipe ends; 16. corrosion and coating: after passing the steel according to user requirements for corrosion and coatings serve you is my pleasure! I plant production and sales of a variety of pipe complete specifications, reliable quality, welcome to visit or inquire! Tel: 022-68290618 13312110395