Straight Seam Welded Pipe

Straight seam welded pipe, is a kind of pipe with welded seam longitudinally parallel to the steel pipe, it is made by rolling up hot-rolled or cold-rolled steel coil to form a round steel pipe then weld together using the welding equipment. (It is known as the straight seam line). Straight seam welded pipe production process is of simplicity, high production, efficiency and low cost. According to the production process, straight seam steel pipe can be divided into high-frequency straight seam steel pipe (ERW pipe) and submerged arc straight seam steel pipe (LSAW pipe). Straight seam steel pipe is mainly used in water works, electricity, agricultural irrigation, urban construction for conveying of gas, steam, liquefied petroleum gas etc.

Straight Seam Welded Pipe

Straight Seam Welded Pipe

A straight seam welded pipe is a vital component in numerous industries, characterized by a weld seam that runs parallel to the length of the pipe. This type of pipe is manufactured through a series of well defined processes.

Here, it is gradually shaped into a cylindrical form. The current's unique properties, such as the skin effect and proximity effect, cause the edges to heat up rapidly. Once they reach the melting point, pressure is applied to fuse the edges together. This forms a continuous straight seam along the pipe's length, and the welded pipe is then cooled to solidify the joint. In the case of submerged arc welding for straight seam pipes, the process is more complex. It starts with careful inspection of steel plates. Edge milling is carried out to ensure proper fit. 

Straight seam welded pipes offer several advantages. They also exhibit good dimensional accuracy, which is crucial for seamless integration into various systems. The surface quality is relatively smooth, reducing friction when transporting fluids. These pipes find extensive applications. In the construction industry, they are used as structural members in buildings, bridges, and industrial facilities due to their reliable strength. They are also common in water supply and drainage systems, efficiently carrying water to and from different locations.

However, compared to seamless pipes, straight seam welded pipes may have limitations in terms of pressure resistance and leak-tightness under extremely high pressure conditions. The weld seam is a potential weak point, although modern manufacturing techniques have significantly improved their performance to meet a wide range of industrial requirements.