Spiral-welded steel pipes are those made by bending steel strips or plates into circular, square, or other shapes and then welding them together, resulting in pipes with visible seams. They can be categorized by welding methods, such as arc welding pipes, high-frequency or low-frequency resistance welding pipes, gas welding pipes, furnace welding pipes, and Bondi pipes. According to the shape of the weld, they can be divided into straight seam welded pipes and spiral seam welded pipes. Welded steel pipes are used in oil drilling and mechanical manufacturing industries. Furnace welding pipes can be used for water and coal gas pipes, while large-diameter straight seam welded pipes are used for high-pressure oil and gas transmission. 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 compared to seamless steel pipes.