Spiral-welded steel pipes are those that are formed by bending and shaping steel strips or plates into circular, square, or other shapes and then welded together, resulting in a seam on the surface. They can be categorized by the welding method, including arc-welded pipes, high-frequency or low-frequency resistance-welded pipes, gas-welded pipes, forge-welded pipes, and Bondi pipes, among others. Based on the seam shape, they are divided into straight seam-welded pipes and spiral-welded pipes. Arc-welded steel pipes are used in the oil and gas drilling and mechanical manufacturing industries. Forge-welded pipes can be used for water and coal gas pipes, while large-diameter straight seam-welded pipes are suitable for high-pressure oil and gas transmission. Spiral-welded pipes are used for oil and gas transmission, piles, bridge piers, and more. Welded steel pipes are more cost-effective and have higher production efficiency compared to seamless steel pipes.