The application of spiral welded pipes is very common. Do you know the production process and technical characteristics of spiral welded pipes?

Production process of spiral welded pipe

1. Uncoiled plate inspection: After uncoiling the steel plate, it enters the production line, and firstly, the whole plate is ultrasonically inspected.

2. Leveling and milling: The original curled steel plate is flattened by an anvil machine, and then double-sided milling is performed on both edges of the steel plate by an edge milling machine to make it reach the required plate width, plate edge parallelism and groove shape.

3. Shearing and forming of spiral welded pipe: on the production line, the steel plate is spirally coiled along the outer edge into a tubular shape.

4. Butt welding cutting: using advanced double-sided submerged arc welding technology to stop pre-welding, inner welding and outer welding. The welded and formed steel pipe is cut to standard length with a plasma ruler.

5. Visual inspection: some basic parameters are checked by professional technicians.

6. Ultrasonic flaw detection: 100% inspection of the inner and outer welds of the spiral welded pipe and the base metal on both sides of the weld.

7. X-ray flaw detection: 100% X-ray industrial TV inspection is performed on the internal and external welds, and an image processing system is used to ensure the flexibility of flaw detection.

8. Pressure test: Test the spiral welded pipe one by one on the hydraulic test machine to ensure that the steel pipe reaches the test pressure required by the specification.

9. Chamfered flat head: Process the spiral welded pipe that has passed the inspection to reach the requested pipe end bevel size

10. Final inspection: Stop the ultrasonic and X-ray flaw detection and stop the magnetic particle inspection of the pipe end again to check whether the spiral welded pipe has welding problems and pipe end defects.

11. Oiling and marking: The qualified spiral welded pipe shall be oiled to prevent corrosion, and the marking shall be stopped according to the user's request.

Technical characteristics of spiral welded pipe

1. During the forming process of the spiral welded pipe, the deformation of the steel plate is uniform, the residual stress is small, and the surface is not scratched. The processed spiral welded pipe has greater flexibility in the range of diameter and wall thickness of the steel pipe, especially in the production of high-grade thick-walled steel pipes, especially large-diameter thick-walled pipes, which have incomparable advantages in other processes. Meet more requirements of users in terms of steel pipe specifications;

2. The processing of the spiral welded pipe adopts the process of pre-welding and then internal and external welding (fine welding), which is not prone to defects such as misalignment, welding deviation and incomplete penetration, and it is easy to control the welding quality;

3. Carrying out the overall mechanical expansion can effectively improve the dimensional accuracy of the steel pipe and improve the distribution of the internal stress of the steel pipe, thereby avoiding the damage caused by stress corrosion, and at the same time, it is beneficial to the welding construction on site;

4. Carry out 9 100% quality inspections on the spiral welded pipe, so that the whole process of steel pipe production is under effective inspection and monitoring, which effectively guarantees the product quality of the spiral welded pipe;

5. All equipment of the whole production line has the function of networking with the computer data acquisition system to realize real-time data transmission, and the central control room collects the technical parameters and quality indicators in the production process.

The above is an introduction to the production process and technical characteristics of spiral welded pipes. If you have more questions, please contact Cangzhou Shenlong Pipe Manufacturing Co., Ltd.!