Zhanjiang Liu six pipe piling Paul: 18033242424 0757-28787975 piling pipe in recent years, widespread use throughout the steel piling, piling pipe diameter increases, the largest technology company in Zhengzhou Zhongyuan steel piling pipe diameter has been produced to 3620mm, coastal, river, lake area was widely used. Two purposes in recent years, the offshore deepwater dock project in the country has also been a large-scale coastal construction, and as the main deep-water pier pile bearing capacity, commonly used large diameter spiral weld pipe pile [1]; In addition, bridges, repair road, high-rise buildings etc. require piling pipe. 3 General symbols marked D: nominal outside diameter of pipe, mm T: nominal pipe wall thickness, mm; M: pipe line quality, kg / m 4 5 usual length of nominal outside diameter 6.0 --- 40m, according to the demand side requirements, the supply and demand sides agreed to supply length beyond the usual length. 6 weight generally in accordance with the theoretical calculation of the weight of gauging; also the two sides negotiate the actual measurement calculation; 7 manufacturing method is a strip coil spiral steel as raw material, often warm extrusion, with automatic double-sided wire submerged arc welding process spiral welded steel pipe. (1) raw materials that strip, wire, flux. Go through rigorous physical and chemical testing prior to investment. (2) strip head and tail docking, single or double wire submerged arc welding, in the rolled steel by automatic submerged arc welding. (3) before forming the strip after flattening, cutting, trimming, planing, surface cleaning and transportation to the curved side. (4) the use of electrical contacts on both sides of pressure control conveyor cylinder pressure to ensure the smooth delivery of the strip. (5) the use of internal or external control roll forming. (6) with gap control device to ensure that the weld gap to meet the welding requirements, diameter, misalignment and weld gap have been strictly controlled. (7) within the welding and soldering are used outside the United States Lincoln welding machine for single or double wire submerged arc welding, thereby obtaining a stable welding specifications. (8) After welding the weld line ultrasonic injury examination was to ensure 100% coverage of non-destructive testing spiral weld. If defects, automatic alarm and spraying tags, production workers and so at any time adjusting the process parameters, and remove defects. (9) using air plasma cutting machine to cut a single tube. (10) cut into a single pipe, each consisting of three steel head first to conduct a rigorous inspection system, the mechanical properties of the weld inspection, chemical composition, fusion status, as well as through the steel surface quality NDT inspection to ensure that the process pipe After passing to formally put into production. (11) there is a continuous acoustic testing marks the site of the weld, manual ultrasonic and X-ray review, if there are defects after repair again after destructive testing, until the confirmation of the defect has been eliminated. (12) strip butt weld, and intersect with spiral weld small joint where the pipe all through the X-ray television or film examination. (13) each pipe after hydrostatic test pressure radial seal. Test pressure and time by a steel pipe pressure microcomputer detection device is strictly controlled. Test parameters are automatically printed records. (14) pipe end machining, so that the end vertical slope altercation and accurate control of the blunt edge. 8 materials generally require Q235 or Q345. Can also be customized according to user needs processing; 9 appearance quality steel weld surface shall not have cracks, broken arc, craters and holes and other defects, the existence of the defect to allow welding weld defects allow grinding or repair. Allow the pipe weld steel head, steel allows docking of two pipe sections together, can be submerged arc butt welding or manual welding processes. References 1. 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