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erw pipe full form Electric Resistance Welding Pipe, is a type of steel pipe manufactured through the resistance welding process, which utilizes the heat generated by the passage of electric current through the metal to fuse the edges of the steel strip. It is characterized by uniform weld seam and high production efficiency, and is widely used in oil and gas transportation, building structures, and machinery manufacturing. Compared with seamless steel pipe, ERW pipe is less costly and suitable for low- and medium-pressure scenarios, but requires strict control of raw materials and processes.

The production process is divided into three steps: first, the steel coil is uncoiled and leveled, and the strip is gradually coiled into a tube through a forming machine; then the edges of the billet are heated using high-frequency current to a molten state, and pressure is applied to complete the weld; and finally, the tube is cooled, sized, and cut by a flying saw to the specified length. Welding is the core of the process, requiring precise control of current, pressure and speed to ensure the strength of the weld.

After forming, several post-treatments are required, including heat treatment of the weld to eliminate stress, ultrasonic or eddy current flaw detection to detect defects, as well as necessary straightening, end-face processing and anti-corrosion coating. Strict on-line testing guarantees the sealing and mechanical properties of ERW pipe, which meets the requirements of different industries for strength and corrosion resistance, making it an outstanding cost-effective pipe choice for modern industry.

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