With the development of China's national economy, large-caliber self-seamed steel pipe hydraulic test machines are increasingly being subjected to oil and gas, pulp transportation, and other advantages such as high pressure bearing capacity, low resistance, low temperature resistance, corrosion resistance, and convenient equipment maintenance. Professionals such as steel structure engineering are welcome.

The main production process of large-caliber self-seam welded pipe is explained:

1. Plate exploration: After the steel plate used to make large-diameter submerged arc welded steel pipes enters the production line, the whole plate is firstly subjected to ultrasonic inspection;

2. Milling: Double-sided milling of both sides of the steel plate by an edge milling machine to reach the required board width, parallelism of the board edges and the shape of the groove;

3. Pre-bending: use the pre-bending machine to pre-bend the board, so that the board has the curvature that meets the requirements;

4. Forming: On the JCO forming machine, first half of the pre-bent steel plate is repeatedly pressed into a "J" shape through repeated step punching, and then the other half of the steel plate is equally zigzag and pressed into a "C" shape, forming an " O "shape

5. Pre-welding: The formed straight seam welded steel pipe is welded and gas maintenance welding (MAG) is selected for continuous welding;

6.Inner welding: use multi-wire submerged arc welding (up to four wires) in the longitudinal direction to weld inside the straight seam steel pipe;

7. Outer welding: choose multi-wire submerged arc welding on the outside of straight seam submerged arc welded steel pipe;

8. Ultrasonic inspection Ⅰ: 100% inspection of the front and back welds and the base metal on both sides of the straight seam welded steel pipe;

9. X-ray inspection Ⅰ: 100% X-ray industrial television inspection of the welds on the surface and the surface, using an image processing system to ensure the sensitivity of flaw detection;

10. Expansion: Expand the diameter of the submerged arc welded straight seam steel pipe to improve the dimensional accuracy of the steel pipe and improve the distribution of the internal stress of the steel pipe;

11. A hydraulic test : In the hydraulic test machine after the pipe-by-diameter steel pipe reaches the root check to ensure that the test pressure specifications, it has a function to record and store active;

12. Chamfering: Pipe end processing will be performed on the steel pipe that has passed the inspection to reach the required pipe end bevel size;

13. Ultrasonic inspection Ⅱ: Perform ultrasonic inspection one by one to check the shortcomings of the straight seam welded steel pipe that may occur after diameter expansion and water pressure;

14. X-ray inspection Ⅱ: X-ray industrial television inspection and tube-end weld seam filming of the steel pipe after the diameter expansion and hydraulic pressure experiments;

15. Tube end magnetic particle inspection: Perform this check to find tube end defects;

16. Anti-corrosion and coating: The qualified steel pipe is anti-corrosion and coated according to user requirements.