Straight Seam Welded Pipe

1. Board probe: After the steel plate used to manufacture large-caliber submerged arc welded straight seam steel pipe enters the production line, the whole board is first ultrasonic inspected;

2. Edge milling: the two edges of the steel plate are double-sided milling through the edge milling machine to achieve the required plate width, plate edge parallelism and groove shape;

3. Pre-bending edge: the pre-bending machine is used to pre-bend the edge of the plate, so that the edge of the plate has the curvature of the requirements;

4. Forming: On the JCO forming machine, the first half of the pre-bent steel plate is pressed into a "J" shape after several steps, and then the other half of the steel plate is also bent and pressed into a "C" shape, and finally the "O" shape of the opening is formed

9. X-ray inspection I: 100% X-ray industrial TV inspection of internal and external welds, using image processing system to ensure the sensitivity of flaw detection;

10. Diameter expansion: the full length of the submerged arc welded straight seam steel pipe is expanded to improve the dimensional accuracy of the steel pipe and improve the distribution of the internal stress of the steel pipe;

11. Water pressure test: in the water pressure test machine to expand the steel pipe after the test to ensure that the steel pipe meet the standard requirements of the test pressure, the machine has automatic recording and storage function;

12. Chamfering: the inspected steel pipe will be processed at the end of the pipe to achieve the required size of the pipe end groove;