Cangzhou Avant International Trade Co., Ltd. is one of the leading manufacturers and suppliers of longitudinal submerged arc welding in China. We are committed to providing high quality customized products with competitive price. Welcome to wholesale cheap longitudinal submerged arc welding in stock here from our factory. Also, free sample is available.
Many new customers are unclear about the differences in the manufacturing processes of various welded pipes, so let's explain it simply. Longitudinal Submerged Arc Welding does not use steel strip coiling; instead, it uses a whole medium-thick steel plate as raw material, gradually pressing it into a pipe blank through a mature JCOE forming process. This results in a regular seam, high pipe roundness, and uniform wall thickness. After forming, it is formed in one go using internal and external double-sided submerged arc welding, which is the key to its quality far exceeding that of ordinary single-sided welded pipes. The submerged arc welding flux covers the weld seam throughout the process, effectively isolating air, resulting in a dense weld seam with an extremely low defect rate and very stable overall mechanical properties. The practical engineering advantages of double-sided welding are very clear. Single-sided welded pipes are prone to problems such as uneven penetration depth, excessive internal weld reinforcement, and potential internal corrosion. Double-sided submerged arc welding, however, allows for simultaneous formation of internal and external welds, uniform penetration, and a smooth, full weld bead. Whether it's internal medium pressure or external soil loads and stress from foundation settlement, the stress is evenly distributed, preventing localized stress concentration. For this reason, LSAW straight seam pipes are particularly suitable for critical pipeline projects requiring long-term continuous operation and where leakage is unacceptable.
Structural Mechanics Advantages and Corrosion Protection Technology
The biggest market advantage of this pipe is its ability to stably produce large-diameter, thick-walled, high-grade steel specifications, which is difficult to achieve with HFW high-frequency pipes and conventional spiral pipes. We can mass-produce standard and non-standard pipes with outer diameters from 325mm to 2420mm and wall thicknesses from 6mm to 120mm, supporting commonly used engineering lengths. Pipe ends can be custom-welded with standard beveling, resulting in smooth, burr-free end faces. This significantly reduces the difficulty of on-site docking overseas, effectively improving construction progress and reducing on-site welding rework costs. The materials and execution standards are fully compatible with acceptance requirements in multiple regions worldwide. Standard Q235B and Q355B materials are widely used in large steel structure columns, bridge and wharf pile foundations, municipal main pipelines, and water conservancy projects. L245, L290, L360, and X42-X70 pipeline steels are manufactured strictly according to API 5L and GB/T 9711 specifications and can be directly used in medium- and high-pressure oil and gas transmission trunk lines. The products also meet the acceptance requirements of many international projects, making them highly adaptable for export.
When purchasing Longitudinal Submerged Arc Welding, it is recommended to focus on the following three points: Matching demanding operating conditions: High-pressure long-distance pipelines must use pipeline steel (such as X70/X80) that meets API 5L or GB/T 9711 PSL2 standards; low-temperature environments require additional Charpy impact testing (-20℃ or -40℃); acidic environments require control of sulfur and phosphorus content and hardness.
Verification of Expansion Process: High-quality LSAW pipes must undergo mechanical or hydraulic expansion to release residual welding stress. During acceptance, the ellipticity (≤0.5%D) and straightness of the pipe ends must be checked.
Non-destructive Testing Requirements: 100% ultrasonic testing reports, 100% X-ray testing reports, and magnetic particle testing reports for the pipe end beveling are required to ensure that the weld and heat-affected zone are free of cracks, lack of fusion, and other defects.
We are a source export factory specializing in high-quality Longitudinal Submerged Arc Welding, offering bulk supply and customized engineering services. We support non-standard specifications, thick-walled special sizes, large-volume orders, and project-related services. We can provide complete material certificates, quality inspection reports, and export documents, and support one-stop services for inspection, customs declaration, and packing. If you are looking for a stable, acceptable, and low-failure-rate LSAW pipe supplier, please contact us anytime for a quick project-specific solution and accurate quotation.
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