As many of us might not know, spiral steel pipe is a spiral seam steel pipe made of strip steel coil as raw material, extruded at room temperature, and welded by automatic double-wire double-sided submerged arc welding process. Because spiral steel pipes have many advantages such as high strength, corrosion resistance, high temperature resistance, and high pressure resistance, they have been widely used in pipeline transportation fields such as municipal administration, water supply, petroleum, and chemical industries.

Today we will dive into the exact production process of spiral steel pipes step by step.

1.Uncoiling and Straightening

of all, we need to have our carefully-selected steel plates of top quality straightened using the straightening machine to make them flat and straight, which lays a solid foundation for subsequent forming and welding.
2.Forming

Next, under the action of the forming machine, the steel plates pass through multiple passes of forming rollers and are gradually curled into a tube shape. During the molding process, it is crucial to control the spacing and speed of the rollers to ensure the accuracy of the tube diameter and wall thickness.
3.Internal and External Welding

Then comes the welding process for the pipe blanks. We use advanced submerged arc welding machines and double-sided welding machines to achieve welding on both inner and outer sides. During the welding process, welding equipment and automatic tracking systems ensure the quality of welds.
4.Pipe Cutting

After welding is completed, we accurately cut the pipes using plasma technology according to the specified size.
5.Inspection

The significance of inspection is sometimes ignored but it can’t be skipped in any circumstance. Advanced technical means such as ultrasonic flaw detector and X-ray inspection equipment are used to comprehensively inspect the weld to ensure its quality. In case of any defect, we need to carry out timely repair and welding until each welded pipe meets the standard.
6.Pipe End Processing

At this stage, it is time to process the pipe end of the steel pipes that have passed the inspection to achieve the required pipe end bevel size. The spiral welded pipe is cleaned by a cleaning machine to remove oil stains and impurities on the surface. An Anti-corrosion treatment needs to be carried out through spraying equipment to provide long-term and effective protection for welded pipes. After this series of treatments, a high-quality spiral welded pipe is finally born.