Large diameter welded pipe; Longitudinal steel or steel with curved molding through seamless steel pickling factory, then made by welding. Press the seam into the form of Longitudinal and spiral welded pipe. Divided into general-use pipe, galvanized pipe, blowing pipe, wire casing, metric pipe, roller tube, deep well pump tubes, automobile tubes, transformers, tubes, welded thin-walled tubes, welded Pipes and spiral welded pipe. Large Diameter Longitudinal main production process: 1. board probe: used to manufacture large diameter submerged arc welding straight seam steel pipe production line after entering saponification seamless steel tubes, the first full-plate ultrasonic testing; 2. Milling: The milling machine for two-sided steel edge milling of small diameter seamless steel pipe, so as to meet the requirements of the plate width, plate edge parallelism and groove shape; 3. Pre-curved edges: the use of pre-bending machine plate edge pre-bending, the plate side has to meet the requirements of curvature; 4. Molding: Molding Machine On JCO first half pre-bent steel plate after punching after several step, pressed into a "J" shape, the other half and then the steel sheet is bent similarly, pressed into " C "shape, the final form of the opening of the" O "ring chamfer 12: The steel pipe inspection conducted after the end of the process, to the pipe end beveling size requirements; 13. Ultrasonic Inspection Ⅱ: by ultrasonic inspection to root again Check the straight seam welded steel pipe in expanding defects that may arise after the water pressure; 14.X-ray inspection Ⅱ: expanding steel pipe after hydrostatic test and industrial X-ray inspection and pipe end welds TV film; 15. Tube end of the magnetic particle inspection: this check is to find defects in the pipe ends; 16. corrosion and coating: steel qualified according to user requirements after corrosion and coatings. Phosphide seamless steel pipe, seamless steel Qingdao, virtue Pipe Co., Ltd. is provided by virtue Liaocheng pipe industry. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead virtue of Industry and you work into the brilliant, for a better future!