Is ERW Pipe Seamless？

ERW (Electric Resistance Welded) pipes are a type of steel pipe that is made by welding the edges of a steel strip or plate together longitudinally. The welding process used in ERW pipes is different from that used in seamless pipes. ERW pipes are made by passing a high-frequency electric current through the metal, which heats it and causes it to fuse. The resulting seam is then cooled and the excess material is trimmed away to create a straight, uniform pipe.

One of the main differences between ERW pipes and seamless pipes is the welding process used to create them. ERW pipes are made by welding the edges of a steel strip or plate together, while seamless pipes are made by extruding a solid cylindrical billet of steel through a piercing rod to create a seamless tube. The seamless process does not involve any welding, and the resulting tube is continuous and uniform in shape and size.

Because ERW pipes are made by welding the edges of a steel strip or plate together, they have a visible seam that runs along the length of the pipe. This seam can sometimes be visible on the surface of the pipe, but it is typically less noticeable than the weld seam on other types of welded pipes, such as spiral-welded or longitudinally welded pipes. The seam on ERW pipes can also be finished to make it less visible or to improve the appearance of the pipe.

ERW pipes are commonly used in a wide range of industries, including oil and gas, petrochemical, power generation, and construction. They are used for a variety of applications, such as transporting fluids and gases, structural support, and mechanical and pressure applications. Because they are made by welding the edges of a steel strip or plate together, ERW pipes can be produced in a range of sizes and wall thicknesses to meet the specific requirements of different applications.

In conclusion, ERW pipes are not seamless. ERW pipes are made by welding the edges of a steel strip or plate together, while seamless pipes are made by extruding a solid cylindrical billet of steel through a piercing rod to create a seamless tube. Both types of pipes have their advantages and disadvantages, and the choice between them will depend on the specific requirements of the application.