ERW pipes or Electric Resistance Welded pipes, are a type of steel pipe that is made by passing a flat steel strip through a series of rollers to create a tube. The edges of the strip are then heated and welded together using an electric current to form a strong and durable seam. ERW pipes are commonly used in a variety of applications, such as water and gas pipelines, structural supports, and the construction of buildings and bridges. They are known for their high strength, durability, and resistance to corrosion.