Welded steel pipes are formed by crimping a steel plate or a steel strip and then welding. According to the weld form, it is divided into straight seam welded steel pipe and spiral welded steel pipe, and the common forming process of straight seam steel pipe UOE forming process and JCOE steel pipe forming process. According to the purpose, it is divided into general welded pipe, galvanized welded pipe, blown oxygen welded pipe, wire casing, metric welded pipe, idler pipe, deep well pump pipe, automobile pipe, transformer pipe, electric welding thin wall pipe, electric welding special pipe and spiral welded pipe.
Generally welded steel pipes are used to deliver low pressure fluids. Made of Q195A, Q215A, Q235A steel. It can also be made from other soft steels that are easy to weld. The steel pipe should be subjected to water pressure, bending, flattening, etc. or the manufacturer can carry out more advanced tests according to its own conditions. The welded steel pipe usually has certain requirements on the surface quality, and the usual delivery length is 4-10 m, which can be required according to actual requirements. Manufacturers are available in fixed length or multiple sizes. The specification of the welded pipe is different from the actual one by the nominal diameter. The welded pipe has two kinds of thin-walled steel pipe and thick-walled steel pipe according to the specified wall thickness. The steel pipe is divided into two types according to the pipe end form: threaded and unthreaded.
Welded steel pipes are widely used in low-pressure fluid transmission engineering and steel pipe structural engineering because their prices are lower than those of the same specification type.
Spiral welded pipe is a spiral seam welded pipe which is made of strip steel plate as raw material, which is often heated and extruded and welded by automatic double wire double-sided submerged arc welding process.
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