LSAW Steel Pipe Production Technology 16 Process Analysis

The board used to making LSAW steel pipe, steel plate into the production line after the first full plate ultrasonic inspection;
　　2. The edge milling: through the two edges of the steel plate edge milling machine double-sided milling, make it meet the requirements of plate, plate edge parallelism and groove shape;
　　3. The bending edge: the use of bending machine for plate bending, make the edge of curvature;
　　4. Molding: on the JCO forming machine bending of the plate after half after many step punching, pressure into a "J" shape, and the other half of the steel plate bending, same pressure into a "C" shape, eventually forming the opening "O" shape
　　5. Early welding: the forming of lsaw mild steel pipe joint with gas protection welding and continuous welding (MAG);
　　6. The welding: the columns more wire submerged arc welding wire (up to 4) in the lsaw steel pipe inside;
　　7. The welding: adopting many wire submerged arc welding of columns in the side of DSAW steel pipe welding;
　　8. Ultrasonic inspection Ⅰ: inside and outside of lsaw steel pipe weld and weld on both sides of the base of 100% of the check;
　　9. X-ray Ⅰ: 100% of inside and outside weld X-ray industrial TV inspection, using image processing system to ensure the sensitivity of detection;
　　10. Hole enlargement, submerged arc welding hole diameter straight seam steel pipe length to improve the size precision of steel tube, and improve the distribution of stress in steel tube;
　　11. Hydraulic pressure test: steel pipe after hydrostatic testing machine for hole enlargement by root inspection to ensure the test pressure of carbon steel pipe meet the standard requirements, the machine has the function of automatic recording and storing;
　　12. Chamfering: after the inspection of steel pipe to pipe processing, meet the requirements of tube end groove size;
　　13. The ultrasonic inspection Ⅱ: root by ultrasonic inspection to check again after the lsaw steel pipe in the hole diameter, water pressure may produce defects;
　　14. X-ray Ⅱ: for hole enlargement and after water pressure test of tube X-ray industrial TV inspection and pipe weld shooting;
　　15. The pipe magnetic powder inspection: check on this to find out the pipe defect;After
　　16. Corrosion protection and coating: qualified coating steel pipe according to user requirements for corrosion protection and coating.