Liu Bao six Tel: 18,033,242,424 18,823,102,210 straight pipe joints are parallel to the longitudinal welds and steel pipe. Usually divided into metric welded steel pipe, welded tube, transformer cooling tubing and more. Longitudinal production process is simple, high efficiency, low cost, rapid development. Spiral Welded Longitudinal generally higher than high, can narrow the billet production of large diameter pipe, you can also use the same width of the billet production of different pipe diameters. However, compared with the same length of straight pipe seam weld length of 30 to 100%, and lower production rate. Straight seam steel pipe according to the production process can be divided into high-frequency straight seam submerged arc welded steel pipe and straight pipe joints. Submerged arc welding straight seam steel pipe according to the different ways of forming divided into UOE, RBE, JCOE steel pipe. Here are the most common high-frequency straight seam submerged arc welding straight seam steel pipe and molding process. 1. The board probe submerged arc welding process: after 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 two-sided plate edge 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. Forming: In JCO forming the first half of the machine after the pre-bending step of the steel sheet after several stamped, pressed into a "J" shape, the other half and then the steel sheet of the same bent, pressed into a "C" shape, and finally the formation of the opening "O" ring 5. Pre-welding: make straight seam welded steel pipe seam after forming and using gas welding (MAG) for continuous welding; 6. internal welding: The tandem multi-wire submerged arc welding (up to four wire) on the inside of the straight seam steel pipe welding; 7. Welded: The tandem multi-wire submerged arc welding straight seam submerged arc welded pipe welding the outside; The ultrasonic inspection Ⅰ: inside and outside of the straight seam welded steel pipe on both sides of the base metal and weld seam 100 % of inspection; 9. X-ray inspection Ⅰ: internal and external welds 100% inspection of X-ray television industry, the use of image processing system to ensure detection sensitivity; 10. flaring: The total length of straight pipe joints SAW the larger diameter pipe to increase the dimensional accuracy, and improve the distribution of the internal stress of the steel pipe; 11. hydrostatic test: On the hydrostatic testing of pipe expanding machine-by-root test after test to ensure the penstock to meet the standards required, The machine has an automatic recording and storage capabilities; 12. chamfer: The steel pipe inspection conducted after the end of the process, to the pipe end beveling size requirements; 13. Ultrasonic Inspection Ⅱ: root again by ultrasonic testing to check straight seam welded steel pipe in expanding defects that may arise after the water pressure; 14. X-ray examination Ⅱ: expanding steel pipe after hydrostatic test and industrial X-ray inspection and pipe end welds TV film; 15. A magnetic particle inspection pipe ends : this check is to find defects in the pipe ends; 16. corrosion and coating: after passing the steel according to user requirements for corrosion and coatings. Straight seam steel is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction. For the transport of liquids: water supply, drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: as piling pipe, for bridges; piers, roads, buildings and other structures tube. Spiral steel pipe, spiral pipe, steel plants, bridges top tube, steel casing, steel coil pipe piling pipe, steel pipe piles, water pipes, billboards column tube, water, piling steel casing pile casing Chaozhou, Guangdong, Guangzhou, Shenzhen, Foshan, Jiangmen Zhanjiang, Maoming, Yangjiang, Zhaoqing, Huizhou, Meizhou, Shanwei, Heyuan, Qingyuan, Dongguan, Zhongshan, Zhuhai, Shantou, Jieyang, Yunfu, Shaoguan Nanning, Beihai, Qinzhou Fangchenggang Guigang Yulin Chongzuo guest Baise, Hechi Hezhou Liuzhou, Guilin, Haikou, Sanya, Hainan Wuzhou Ji'an, Jiangxi Ganzhou, Fuzhou, Shangrao, Yichun spiral galvanized spiral, spiral steel pipe Factory price spiral, spiral pipe manufacturers, large diameter steel pipe. Spiral steel pipe, spiral pipe, welded steel pipe, bridge jacking, steel casing, piling pipe, steel pipe piles, water pipes, billboard products provide a sand column pipe, corrosion, zinc, processing