ERW pipes are manufactured by cold-forming a steel coil into a cylindrical shape and then passing an electric current to fuse the edges together. This makes them suitable for small to medium diameters and for applications where cost efficiency and light weight are priorities.

LSAW pipes, on the other hand, are formed by bending steel plates and welding the seams longitudinally using submerged arc welding. This process creates thicker walls and larger diameters, making them better suited for heavy-duty and high-pressure environments.