1. Detective: After the steel plate enters the production line, the full board ultrasonic inspection is performed first;
2. Milling edge: Double -sided milling on the two edges of the steel plate by the milling machine can achieve the required plate width, parallel parallel degree and slope shape;
3. Pre -bending edge: Use the pre -bending machine to pre -bending on the edge of the board to make the edge of the board have a curved curvature;
4. For molding: First of all, half of the steel plates after the pre -curved steel plate were stamped multiple times on the JCO molding machine, pressed into a J -shaped, and then the other half of the steel plate was also bent, pressed into a shape, and finally formed an O -shaped open;
5. Pre -welding: After the formation is formed, the steel pipe is sewed and the gas protection welding (MAG) is used for continuous welding;
6. Internal welding: Use the columns to bury the arc welding (up to four wires) on the inside of the straight steel pipes;
7. External welding: Welded on the outside of the spiral arc welded steel pipe with the use of the columns of multi -buried arcs;
Ultrasonic test
Check a 100%inspection of the mother material of welded and welded seams and welds inside and outside the spiral steel pipe;
8. X -ray inspection: 100%X -ray industrial TV inspection of welded seams internal and external welds, using an image processing system to ensure the sensitivity of the detection;
9. Expansion: The full length of straight steel pipes is expanded to improve the size and accuracy of the steel pipe and improve the distribution state of the stress in the steel pipe;
10. Water pressure test: The steel pipe after the diameter expanded on the hydraulic test machine is inspected to ensure the test pressure of the steel pipe to meet the standard requirements. The machine has an automatic recording and storage function;
11. Inverted edges: The pipe ending of the steel pipe after the inspection is passed to meet the required pipe end slope size;
Ultrasonic test II: Ultrasonic inspection is performed again to check the defects that the straight welding steel pipes may produce after the diameter and water pressure;
X -ray examination Ⅱ: X -ray industrial TV inspection and pipe welded filming of the steel pipes after the diameter and hydraulic test;
Tube end magnetic powder test: conduct this inspection to discover tube -end defects;
Corruption and coating: The qualified steel pipes are preserved and coated according to user requirements.
