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Forming method of large-diameter straight seam welded pipe

The forming process methods of large-diameter longitudinally welded pipe (LSAW) mainly include: UOE forming method, JCOE forming method, CFE column rolling forming method, RBE rolling forming method and C forming method, etc. The brief introduction is as follows:
1. UOE forming method: After planing or milling the wide and thick steel plate (welding the arc guide plate before milling), pre-bend the edge on the pre-bending machine, press the U-shaped press into a U-shaped press, and then press on the O-shaped press Into an O-shaped tube. After pre-welding, the pipe is sent to multiple welds, and the inner and outer grooves are welded into steel pipes. Expand the diameter of the steel pipe to improve the dimensional accuracy. After the weld passes various inspections, the inner and outer surfaces are coated with an anti-corrosion layer. UOE process equipment selects steel plate milling machines, pre-bending machines, U-shaped presses, O-shaped presses, pre-welding machines, internal and external welding machines, pipe expansion machines, non-destructive testing equipment, hydraulic testing machines, and external coatings for internal and pipe equipment, etc. .
2. JCOE forming method: After the steel plate is pre-bent at the end of the pre-bending machine, one half of the steel plate is gradually pressed into a J shape from one side, and the other half is gradually pressed into a C shape on one side. After medium pressure, an O-shaped open tube blank is formed, which is welded by a steel pipe welding pre-welder, and then welded by an automatic submerged arc welding internal and external welding machine to form a steel pipe.
3. CFE row roll forming method: The row roll forming machine is composed of a preformed frame, a flat roll frame, a hemming roll and a small row roll frame. Due to the arrangement of many small rows of identical rollers, the steel plate is formed during the forming process. The trajectory of the edge is almost straight, avoiding the phenomenon of “edge stretching”. CFE method has good molding quality, and its product quality is no different from UOF method. This method uses hot-rolled strip steel coils as raw materials, which is different from other forming methods. It is mainly used to produce large-scale, single-quality steel pipes, but it is difficult to produce high-strength thick-wall steel pipes and large-diameter steel pipes.
4. RBE roll forming method: During roll forming, the steel plate is rolled multiple times between three or four rolls. The welded pipe produced by this method is close to UOE welded pipe in performance and reliability. RBE method has small investment, moderate output, great flexibility and strong adaptability to the market.
5. C forming method: use two C forming machines to replace the U press and O press in the UOE production line. The forming process is: the pre-bent steel plate is first formed into half of the steel plate on the first press, and then the other half of the steel plate is formed on the other side of the press to obtain an O-shaped round pipe. The welded pipe produced by the C forming method is of suitable size, moderate output, and low price of the production line.


Post time: Jul-06-2021
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