Welded pipe is the abbreviation of welded steel pipe, which refers to steel pipe formed by crimping steel plate into round or square pipe and welding. It is widely used in water conservancy projects, municipal drainage, tap water transportation and other projects. In actual production and application, welded pipes are usually divided into two types: straight seam welded pipe and spiral welded pipe according to the welding method. Longitudinal welded pipe: usually a welded pipe of medium and small diameter with a nominal diameter of DN15 (4 in charge)-DN150 (6 inch pipe). The straight seam welding process is simpler than the spiral welding process, the welding cost is low, and the efficiency is high. The disadvantage is that the welds are in the same straight line and the compressive strength is low. Therefore, the straight seam welding is only suitable for the production of small and medium diameter welded pipes. Spiral welded pipe: usually a large diameter welded pipe with a nominal diameter of DN200 (8-inch pipe)-DN600 (24-inch pipe). The spiral welding process can produce welded pipes of different pipe diameters with the same width of steel plate. The disadvantage is that the process is complicated. The spiral welded seam of the welded pipe of the same length is much longer than the straight welded seam, resulting in high production costs and low production efficiency. Therefore, spiral welding is commonly used. For the production of large-diameter welded pipes, the spiral weld has higher compressive strength, which ensures the compressive resistance of large-diameter welded pipes. Welded pipe is the abbreviation of welded steel pipe, which refers to steel pipe formed by crimping steel plate into round or square pipe and welding. It is widely used in water conservancy projects, municipal drainage, tap water transportation and other projects. In actual production and application, welded pipes are usually divided into two types: straight seam welded pipe and spiral welded pipe according to the welding method.
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