Spiral-welded steel pipes are those formed by bending steel strips or plates into circular, square, and other shapes, then welded together, with a seam on the surface. They can be categorized by welding methods into arc-welded pipes, high-frequency or low-frequency resistance-welded pipes, gas-welded pipes, furnace-welded pipes, and Bondi pipes, among others. According to seam shape, they can be divided into straight seam-welded pipes and spiral seam-welded pipes. Electric-welded steel pipes are used in oil and gas drilling, mechanical manufacturing, and more. Furnace-welded pipes can be used for water and coal gas pipes, large-diameter straight seam-welded pipes are used for high-pressure oil and gas transmission, and spiral seam-welded pipes are used for oil and gas transmission, pile foundations, bridge piers, etc. Welded steel pipes are more cost-effective and have higher production efficiency than seamless steel pipes.