Spiral-welded steel pipes are those made by bending and deforming steel strips or plates into circular, square, or other shapes and then welding them together, resulting in a seamless 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. They can also be divided into straight seam and spiral seam pipes based on the seam shape. Arc-welded pipes are used in the oil and gas drilling industry and mechanical manufacturing. Furnace-welded pipes can be used for water and coal gas pipes, while large-diameter straight seam pipes are used for high-pressure oil and gas transmission. Spiral-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.