Modern techniques for producing large-diameter steel pipes include longitudinal submerged arc welding (LSAW) and helical submerged arc welding (HSAW). By producing strong, long-lasting pipes for a variety of uses, these pipes have transformed the industry. The main characteristics, production procedures, product quality, and applications of LSAW & HSAW pipes will all be covered in this article. These pipes, which provide dependable and effective solutions for fluid transportation, are now essential components of the oil and gas sector, water transmission networks, and infrastructure development projects.
LSAW Pipes:
Utilizing the longitudinal submerged arc welding procedure, LSAW pipes are created. A submerged arc welding head is used to longitudinally weld the steel plates after they have been first shaped into a pipe shape. This method of welding produces a strong and continuous weld that runs the entire length of the pipe. Large-diameter pipes with thick walls may be created with LSAW pipes, making them ideal for high-pressure applications. These pipes’ high strength, superior bending stiffness, and dimensional correctness make them a common choice for transportation in the oil and gas industry.
HSAW Pipes:
Helical welding is used to create HSAW pipes, often referred to as Spiral Submerged Arc Welding (SSAW) pipes. Submerged arc welding is used to continuously weld a spiral-shaped coil of steel strip. This procedure ensures a strong and continuous weld along the entire length of the pipe while producing a seamless appearance. For applications requiring long-distance fluid transportation, such as oil and gas pipelines and water transmission systems, HSAW pipes are chosen. They are ideally suited for such tasks due to their enormous diameters and extended lengths.

Exacting quality criteria are followed by both LSAW and HSAW pipes to ensure their dependability and performance. The use of premium steel during manufacturing gives the pipes their amazing strength and endurance. The specific material composition may vary depending on the application’s requirements and relevant industry standards. Among the materials that are widely used are carbon steel, low alloy steel, and stainless steel. These substances offer resistance to corrosion and high pressure, ensuring the pipes’ long-term performance.
LSAW and HSAW pipes are put through a multitude of quality control methods during the manufacturing process. These precautions include chemical analysis, mechanical testing, and non-destructive testing to ensure compliance with the stated standards. The pipes are examined for dimension accuracy, straightness, weld integrity, and surface quality. It is necessary to adhere to the criteria outlined in industry standards and guidelines, such as API 5L for oil and gas pipelines or ASTM for all other pipe applications.