How to Choose Welded Pipe Plates?

Welded pipes, abbreviated as welded steel pipes, refer to steel pipes formed by curling steel plates into round or square shapes and then welding them. They are widely used in projects such as hydraulic structures, municipal drainage, and water transmission.

The materials for welded pipe plates are usually carbon steel or alloy steel, and the specific material varies depending on the application and requirements of the pipeline. These plates undergo multiple processes during production, including hot rolling, cold rolling, cutting, forming, and welding. Welding is one of the most critical steps because the quality of the weld directly affects the performance and service life of the pipeline. In actual production and application, welded pipes are usually classified into two types: straight seam welded pipes and spiral welded pipes.

Straight Seam Welded Pipes: These are typically welded pipes with nominal diameters ranging from DN15 (1/2 inch pipe) to DN150 (6-inch pipe). The straight seam welding process is simpler and more cost-effective than spiral welding, with higher efficiency. However, the disadvantage is that the weld seam is located along the same straight line, resulting in lower compressive strength. Therefore, straight seam welding is only suitable for producing small and medium-diameter welded pipes.

Straight Seam Welded Pipes

Spiral Welded Pipes: These are typically welded pipes with nominal diameters ranging from DN200 (8-inch pipe) to DN600 (24-inch pipe). The spiral welding process allows the production of welded pipes of different diameters using steel plates of the same width. However, this process is more complex and results in longer weld seams compared to straight seams, leading to higher production costs and lower efficiency. Therefore, spiral welding is commonly used for large-diameter welded pipes. Additionally, the spiral weld seam has higher compressive strength, ensuring the compressive capacity of large-diameter welded pipes.

Spiral Welded Pipes

The measurement of welded pipes generally includes weighing and theoretical calculation. Weighing involves actual weighing using scales, while theoretical calculation determines the weight according to a theoretical formula: “Weight per meter (kg) = (outer diameter mm – wall thickness mm) * wall thickness mm * 0.02466”.

Several factors need to be considered when selecting suitable welded pipe plates:

Pipeline Requirements: Firstly, understand the specific requirements of the welded steel pipe you need. This includes the diameter, wall thickness, material, etc., of the pipeline. Based on these requirements, determine the dimensions, thickness, and material of the welded pipe plates needed.

Material Selection: Choose suitable plate materials according to the application environment and requirements. Common materials for welded pipe plates include carbon steel, low-alloy steel, and stainless steel. Consider factors such as corrosion resistance, strength requirements, and operating temperature when selecting the appropriate material.

Plate Thickness: The thickness of welded pipe plates should be determined based on the diameter, wall thickness, and application environment of the pipeline. Generally, larger diameter and thicker-walled pipes require thicker welded pipe plates to ensure structural stability and strength.

Surface Quality: The surface quality of welded pipe plates is crucial for welding quality and appearance. Select plates with smooth surfaces, free from obvious defects and damage, to ensure the reliability of the welding process and the quality of the weld seam.

Bending Performance: If the pipeline needs to be bent or arranged in curves, choose welded pipe plates with good bending performance. This can help avoid problems such as cracking or deformation during bending.

Standards and Certification: Choose welded pipe plates that comply with relevant standards and certification requirements based on specific application needs. For example, the petroleum and natural gas industries may require compliance with API 5L standards.

Sustainability Considerations: Consider selecting welded pipe plates that adhere to sustainable development principles. This includes using recyclable materials, low-carbon emission production processes, and economically feasible recycling and reuse schemes.

Supplier Selection: Choose reliable suppliers or manufacturers to ensure the provision of high-quality welded pipe plates. Consider factors such as supplier reputation, quality assurance systems, and delivery capabilities.

In conclusion

Selecting suitable welded pipe plates requires consideration of multiple factors to ensure the quality, performance, and sustainability of the welded pipes produced. Contact us for more!