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Welded steel pipes are produced by welding two pieces of steel together to form a continuous tube. The process of manufacturing welded pipes involves several steps. The first step is to coil a flat strip of steel into a cylindrical shape, which is known as a skelp. The skelp is then passed through several forming rolls, which shape it into a tube with a longitudinal seam.

Once the tube is formed, the edges are heated and welded together using one of several methods, such as electric resistance welding (ERW), submerged arc welding (SAW), or high-frequency welding (HFW). The type of welding used depends on the specific application and the desired properties of the final product.

Welded pipes are more cost-effective than seamless pipes, making them suitable for applications where cost is a critical factor. They are also available in larger sizes and thicknesses than seamless pipes, making them suitable for applications where strength and durability are essential.

In conclusion, steel pipes can be manufactured in two ways: seamless and welded. Seamless pipes are produced by piercing a solid billet of steel to form a hollow tube, while welded pipes are produced by welding two pieces of steel together to form a continuous tube. The choice of manufacturing method depends on the intended use of the final product, with seamless pipes being suitable for applications where a smooth surface finish and high strength are required, while welded pipes are more cost-effective and available in larger sizes and thicknesses, making them suitable for applications where cost and durability are essential.