What operations should be performed to ensure uniform and consistent thickness of 3PE-coated steel pipes?
Release time:
2021-06-23
Improve the dimensional accuracy of 3PE-coated steel pipes, ensuring smooth weld seams and reducing weld height. At the same time, strengthen weld reinforcement control to ensure smooth weld transitions. When necessary, grind the weld seams to minimize weld reinforcement. In terms of pipe forming, enhance the positioning accuracy of the forming rolls, maintain flexible operation of each roll, and ensure that the surfaces of all rolls are perfectly level. During welding, increase the bevel angle of the weld seam. When feeding the steel strip, add a set of vertical rolls upstream of the guide plates. These measures can improve the stability of both forming and conveying processes, resulting in smoother weld seams, reduced weld height, and minimized deviations in pipe shape. Furthermore, to further reduce weld reinforcement, install comprehensive weld-grinding equipment.
1. Improve 3PE anti-corrosion steel pipe The dimensional accuracy of the external shape ensures smooth weld seams and reduces weld height. At the same time, enhanced control over weld reinforcement is implemented to guarantee a smooth transition at the weld. When necessary, weld seams should be ground down to minimize weld reinforcement. In terms of pipe forming, improving the positioning accuracy of the forming rolls and ensuring that each roll operates smoothly with consistent surface levels are crucial steps. During welding, increasing the bevel angle of the weld seam can further enhance the process. Additionally, by adding a set of vertical rolls upstream of the guide plates during steel feeding, the stability of both forming and conveying processes is significantly improved, resulting in smoother weld seams, reduced weld height, and minimized deviations in pipe shape. Furthermore, to further reduce weld reinforcement, a full-weld grinding device has been installed, yielding excellent results.
2. Enhance the accuracy of transmission lines—i.e., improve their operational stability and reduce unevenness in the thickness of anti-corrosion coatings caused by fluctuations in 3PE-coated steel pipes. In addition, increase the level of automation to ensure consistency in technical parameters such as spacing and overlap.
3. On the basis of ensuring adequate compaction by the roller, select rollers with lower hardness whenever possible and maintain a consistently stable roller pressure. To ensure stable roller pressure, a small air reservoir has been added to the roller, further reducing interference from other pneumatic equipment on the roller pressure.
4. Enhance the water-cooling effect. To ensure rapid hardening of the anti-corrosion coating as it enters the water-drenching section and to reduce uneven thickness of the coating caused by roller-induced friction and compression—particularly for large-diameter, thick-walled 3PE anti-corrosion steel pipes with slower heat loss— in addition to ensuring that the outer surface of the anti-corrosion pipe is cooled by circulating water, an internal cooling device has also been installed inside the pipe. This internal cooling system assists the external cooling water in rapidly lowering the pipe’s temperature, effectively speeding up the hardening process of the anti-corrosion coating and reducing variations in coating thickness.
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