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The steel tube mill production line is an essential equipment system for manufacturing welded steel pipes, including straight seam welded pipes and spiral welded pipes. It is widely applied in industries such as petroleum, natural gas, construction, machinery manufacturing, water supply, and heating. Below is a comprehensive overview of the welded pipe production line, including its classification, main components, production process, and features.

The production line can be categorized by welding methods, pipe shapes, and applications. By welding methods, there are high-frequency straight seam welded pipe lines, which use high-frequency currents to heat the edges of steel strips and weld them, ideal for producing thin-walled and small-to-medium diameter pipes; submerged arc welded pipe lines (SAW), which employ submerged arc welding for thick-walled and large-diameter pipes; and laser welded pipe lines, which utilize laser beams for high-precision welds. By pipe shapes, the production line can produce round pipes, square and rectangular pipes, as well as special-shaped pipes such as elliptical and hexagonal pipes. By applications, it is divided into fluid transportation pipe lines, structural pipe lines, and specialized pipe lines, such as heat exchanger pipes and automotive pipes. These classifications demonstrate the production line’s versatility and adaptability for various industrial demands.

The welded pipe production line consists of several key components. The feeding and uncoiling unit includes an uncoiler to expand steel coils and a leveling machine to straighten the steel strip. A shearing and welding machine trims and welds the strip’s head and tail to ensure continuous production. The forming and guiding unit gradually forms the steel strip into a pipe through a series of rollers, while the guiding system ensures accurate positioning. The welding system, often the core of the line, includes high-frequency welding equipment for efficient pipe edge welding, or arc/laser welding systems for specialized applications. After welding, weld seam treatment equipment removes excess material and performs heat treatments to improve the weld’s structure and strength. The sizing and straightening equipment ensures the pipe meets precise dimensional and straightness standards. Online inspection systems, such as eddy current and ultrasonic testing, verify the quality of the weld seams and pipe bodies. Finally, the cutting device, usually a flying saw or circular saw, cuts pipes to specified lengths, and the discharge and stacking devices organize the finished products for transport.

The production process begins with raw material preparation, where steel strips are uncoiled, leveled, and trimmed. The forming process gradually shapes the strip into a tubular structure. Welding is then performed, using high-frequency heating to fuse the edges or arc welding with filler material for thicker pipes. The weld seam undergoes treatment to remove excess material, and the pipe is heat-treated if necessary. Next, the pipe is sized and straightened to meet the design requirements. Quality inspections are conducted through non-destructive methods to ensure compliance with standards. The final steps involve cutting the pipes to the desired lengths and stacking them for classification and storage.

Welded pipe production lines offer several advantages. They are highly efficient, with automated and continuous operation enabling high-speed production. The product quality is stable, with welds possessing high strength and mechanical properties close to the base material. These lines accommodate a wide range of materials and pipe specifications, from small-diameter, thin-walled pipes to large-diameter, thick-walled pipes. Energy efficiency and environmental friendliness are also key features, with high-frequency induction welding minimizing energy consumption and pollution. Additionally, the line's ability to produce diverse pipe shapes and sizes ensures it can meet various market needs.

The welded pipe production line is a critical piece of industrial equipment with broad applications. Its technological advancements and optimization capabilities significantly enhance production efficiency and product quality, making it indispensable for modern manufacturing industries.

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