ERW stands for Electric Resistance Welded. ERW pipe is a type of steel pipe that is manufactured by cold-forming a flat steel strip into a rounded tube and passing it through a series of forming rollers to obtain a longitudinal seam. The two edges are then simultaneously heated with a high-frequency current and squeezed together to produce a bond. The longitudinal ERW seam does not require filler metal while impurities in the heat-affected zone are extruded during the welding process.
ERW pipe is made from steel coil, and the weld seam runs parallel to the pipe. The width of the coil is the same as the circumference of the pipe, so diameters are limited. ERW pipe is manufactured by cold forming a flat steel strip into a rounded tube and passing it through a series of forming rollers to obtain a longitudinal seam. The finished pipe is visually inspected by Quality Control (QC), and if required, Ultrasonic (UT) testing is performed to ensure the weld is defect-free. The Sizing Section squeezes the welded pipe into the precise roundness, outer diameter, and straightness tolerances specified by the customer. The flying cut-off saw attaches to the pipe as it is being produced and cuts the pipe to the length specified by the customer.
ERW pipes are welded longitudinally, manufactured from Strip/Coil, and can be manufactured up to 24” OD. ERW pipe is mainly used for low/medium pressure applications such as transportation of water/oil. ERW pipes can take much higher loads for long, unsupported lengths, and bracing rings can be used to keep the pipe thicknesses to a minimum.
In summary, ERW pipe is a type of steel pipe that is manufactured by cold-forming a flat steel strip into a rounded tube and passing it through a series of forming rollers to obtain a longitudinal seam. The two edges are then simultaneously heated with a high-frequency current and squeezed together to produce a bond. ERW pipes are welded longitudinally, manufactured from Strip/Coil, and can be manufactured up to 24” OD. ERW pipe is mainly used for low/medium pressure applications such as transportation of water/oil.
