Spiral-welded steel pipes are those made by bending and deforming steel strips or plates into circular, square, and other shapes before welding, resulting in pipes with seams on the surface. They can be categorized by welding methods such as arc welding, high-frequency or low-frequency resistance welding, gas welding, furnace welding, and Bondi pipes, among others. According to the shape of the weld, they can be classified into straight seam welded pipes and spiral seam welded pipes. Welded steel pipes with electric welding are used in oil and gas drilling, mechanical manufacturing, and other industries. Furnace-welded 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, pipe piles, bridge piers, etc. Welded steel pipes are more cost-effective and have higher production efficiency compared to seamless steel pipes.