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Welded steel pipe, also known as welded pipe, is a steel pipe which welded by steel plate or strip after the coil shaping. Welding steel pipe is simple in production process, high in production efficiency, various in specifications, and the equipment capital is not much. Generally, the strength of welded steel pipe is lower than the seamless steel pipe. Since the 1930s, with the rapid development of rolling production of high quality cold rolling strip steel and progress of welding and inspection technology, welding quality continuously improve. What’s more, specifications of welding steel pipe are increasing and instead of the seamless steel pipe in more and more fields.
According to the form of Welded steel pipe weld, it is divided into longitudinal and spiral welded pipe. The billet that welded steel pipe adopted is steel plate or strip steel. Because of the different welding process, welded steel pipe is divided into furnace welded pipe, welded (ERW) pipe and automatic arc welding pipe. Due to its different welding form, it can be divided into straight seam welded pipe and spiral welded pipe. Because its shape of end is different, it can be divided into circular welded pipe and alien welded pipe.