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Longitudinal welding machine production process is simple, high production efficiency, low cost and rapid development. The strength of spiral welded pipe is generally higher than the straight seam welded pipe, the pipe can be used to produce larger diameter welded pipe with a narrower blank, but also the same width of the billet pipe production of different diameters. However, compared with the same length of straight pipe, weld length increased by 30 ~ 100%, and the production rate is low.
Cold rolling mill design types can be divided into many kinds, can meet different processing needs to be customized. According to different standards to distinguish the type of mill. If you choose according to the plate processing, cold-rolling mill used in the processing of sheet metal can be hot-rolled and cold-rolled two, in the precise thickness of the rolling case, the mill can be divided into cold-rolled plate Two types of cold-rolling mills are also available.
Second, the cold-rolled steel style is usually open cross-section, making the cross-section of the lower freedom to change the stiffness. Be prone to change in the bending, bending prone to bending flexure, compression, torsion function is poor. Third, cold-formed steel wall thickness is small, in the corner of the plate joints and no thickening, to withstand the localized capacity of the concentrated load is weak.
