What are the production processes of welded pipe?

Panel exploration: used to manufacture large diameter submerged arc welded straight seam steel pipe steel plate into the production line, the first full-plate ultrasonic inspection; milling: through the milling machine on both edges of the steel plate double-sided milling, so that it reaches the required width, edge parallelism and the shape of the bevel; pre-bending: the use of pre-bending machine for the pre-bending of the plate edge, so that the edge of the plate to have the curvature to meet the requirements of the molding: the JCO molding machine will be the first pre-bending Forming: JCO molding machine will first be pre-bent half of the plate after a number of step stamping, pressed into the "J" shape, and then the other half of the plate will be similarly bent, pressed into the "C" shape, and finally form an open "O" pre-welded.

To make the molded straight seam welded steel pipe seam and gas shielded welding (MAG) for continuous welding; internal welding: the use of longitudinal multi-wire submerged arc welding (up to four wires) on the inside of the straight seam welded steel pipe; external welding: the use of longitudinal multi-wire submerged arc welding on the outside of the straight submerged arc welded steel pipe; ultrasonic inspection Ⅰ: inside and outside of the welded straight seam weld and weld on both sides of the base material 100% of the inspection X-ray inspection Ⅰ: on the inside and outside of the weld and weld on both sides of the base material Inspection X-ray inspection Ⅰ: 100% of the internal and external welds X-ray industrial television inspection, using image processing system to ensure the sensitivity of the flaw detection; Expansion: submerged arc welded straight seam steel pipe full length of the expansion in order to improve the dimensional accuracy of the steel pipe, and to improve the distribution of internal stress in the steel pipe Hydraulic test: in the hydraulic testing machine after the expansion of the steel pipe for the test one by one in order to ensure that the steel pipe to meet the standard test Pressure, the machine has automatic recording and storage function.

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