Large diameter welded pipe; steel or steel welded pipe is bent after molding, 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 into the production line, the first full-plate ultrasonic testing; 2. Milling: The milling machine for steel two Edge-sided milling, 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 edges have to meet the requirements of curvature; 4. Molding: Molding Machine On JCO first half pre-bent steel plate after stepping through several punching, pressed into a "J" shape, the other half and then the steel sheet of the same bent, pressed into a "C" shape, forming an opening of the last " O "ring 16 16 manganese steel pipe soldering manganese is a strength higher than the average of ordinary low carbon low-alloy steel, in pipeline construction, with a 16-manganese steel instead of carbon steel in general, you can save a lot of steel to the country . 16 has some hardened manganese steel seamless steel pickling price tendency, when subzero soldering small diameter seamless steel pipe, there may affect the mechanical properties of welded joints in brittle tissue, or in the weld and heat affected zone in cracks and other phenomena. Required combat readiness, some 16 manganese steel seamless steel pickling factory pipeline project, required welding work in the Northeast winter conditions, 16 manganese steel pipe soldering field (refer to below -10 ℃), currently still at home and abroad No mature experience. Therefore, soldering is a key 16 Mn pipeline construction quality assurance. Pickling seamless steel pipe industry virtues (certified), Dongying seamless steel pipe industry by virtue of Liaocheng Limited. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) Shandong Liaocheng, steel leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Industry leaders in the United States and Germany with the staff warmly welcome all inquiries negotiations to create the virtues pipe industry a better future.