Hydrostatic test is necessary to ensure the quality of welded pipe production equipment. Currently, the market is on the market pipe hydrostatic testing machine working process: feeding, clamping, filled with water, pressure, pressure, pressure relief, the material.

Extrusion method refers to the metal blank into the extruder barrel, extrusion molding and extrusion rod composed of "closed" container by applying pressure to force the metal extruded rod extrusion die orifice outflow from, and access to metal plastic molding the method, which is a historic seamless manufacturing methods

construction machinery with a large number of rectangular pipe steel structure, which is generally used rectangular tubing.rectangular welded seam components will inevitably lead to a large section of the larger welding deformation, which must try to prevent it. the main deformation as: transverse s