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As the so-called layman watches the fun, the expert watches the doorway. Buying a welded pipe unit is like buying something. Usually, the understanding of this kind of product is relatively small, and we will pay more attention to the parameters and configuration. If we have bought it, we will defin

Spiral steel pipe production process: It is a spiral seam steel pipe made of strip steel coil as raw material, often warmly extruded, and welded by automatic double-wire double-sided submerged arc welding process.(1) The raw materials are strip coil, welding wire and flux. They must undergo strict p

When there is a problem with the congenital defects of the substrate, no matter what kind of equipment is used, there will be grinding errors. The defects include large deformation of the substrate, inconsistent thickness, and large tolerance of the inner hole. Among them, the large deformation of t