The straight seam welded pipe is now used in many areas, and let's take a look at how it was manufactured.
1. Steel plate probe: The buried arc welded large diameter tube connector behind the steel plate is a straight line. First, check the entire board's ultrasonic inspection.
2. Edge milling: Use the milling machine to perform double -sided milling on both sides of the steel plate to meet the requirements of the width, parallel parallel side and slot shape of the plate;
3. Pre -bending edge: Use the pre -bending machine to pre -bending the edge node to make the edge of the board have a curved curvature;
4. molding: On the JCO forming machine, the semi -curved steel plate was pressed multiple times into "J", then the other half of the steel plate was bent into "C", and the opening "O" shape was finally formed.
5 Pre -welding: Preparation of straight seam welding steel pipes, using gas welding (MAG) continuous welding;
6. Internal welding: Welded inside the straight seam steel pipes with longitudinal multi -wire buried arc welding (not exceeding four lines).
7. External welding: The vertical multi -filament arc welding is used for the outer welding of the stitched arc welded steel pipe.
8. Ultrasonic Detective I: 100 % check the metal on both sides of the welds and welds inside and outside the tube of the straight seams;
9. X -ray Detective I: 100 % X -ray industrial TV inspection of welding seam information internal and external welds can be performed. The use of these image data processing management systems can ensure the sensitivity of the detection.
10. Diameter expansion: The full length of buried arc welding straight seam steel pipes is expanded to improve the size and accuracy of the steel pipe and improve the distribution of stress in the steel pipe.
11. Water pressure test: The steel pipes after the diameter swelling are checked one by one on the hydraulic test machine to ensure that the steel pipe reaches standard test pressure. The machine has the function of automatic recording and storage.
12. Facking: The inspection of the steel pipe is processed at the end of the tube to meet the signs required by the end of the pipeline.
13. Ultrasonic examination II: Ultrasonic check again to check the defects that may occur after the diameter expansion and water pressure of the straight seam welded steel pipe.
14.X ray test II: X -ray industrial examination and tube -end welding sewing membrane diameter expansion and hydraulic test;
15. Magnetic powder test at the end of the tube: This test is to find out the defects of the end of the tube;
