Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

Straight seam welded pipe forming process techonogly


Straight seam welded steel pipe forming process 
The large diameter longitudinally welded pipes production process description: 
A board probe: used to manufacture large diameter submerged arc welding straight seam steel plate into the production line, the first full-board ultrasonic testing; 
(2) Milling: Milling Machine on the plate edge milling on both sides so as to achieve the required plate width, plate edge parallel to the degree and shape of the groove; 
Pre curved edge: the pre-bending machine plate edge pre-bending side of the board has to meet the requirements of the curvature; 
Straight seam  welded steel pipe
Molding: JCO molding machine first half of the pre-bent steel plate steel plate after multiple step stamping, pressed into a "J" shape, and then the other half of the same bent, pressed into the "C" shape, and finally the formation of openings "O"-shaped 
(5) pre-welding: after forming the straight seam welded steel pipe seam gas shielded arc welding (MAG) of continuous welding; 
Within the welding: tandem wire submerged arc welding (up to four wire) in the inside of the straight seam steel pipe welding; 
Outside welding: LSAW pipe tandem multi-wire submerged arc welding the outside of LSAW;
8 ultrasonic testing I: straight seam welded steel pipes inside and outside welds and weld on both sides of the base metal, 100% of the check; 
X-ray examination I: internal and external welds 100% of the X-ray industrial TV inspection, image processing system to ensure that the sensitivity of the flaw; 
10 expanding: submerged arc welding pipe joints straight full-length expanding in order to improve the dimensional accuracy of steel pipe, and improve the state of stress distribution within the steel pipe; 
11 hydraulic test: hydrostatic testing machine, steel pipe expanding by inspection to ensure that the steel pipe to reach the standard required test pressure, the aircraft with automatic recording and storage capabilities; 
12. Chamfering: after passing inspection, pipe by pipe-end processing, to achieve the required pipe end beveling size; 
13 ultrasonic testing II: again by the root of ultrasonic testing to check for straight seam welded steel pipe that may arise after expanding, hydraulic defects; 
14. X-ray examination II: steel pipe expanding and hydrostatic test film of the X-ray industrial TV inspection and welding of Welded pipe ends; 
15 Magnetic particle inspection of the pipe end: this check to find the tube end defects; 
16 anti-corrosion and coating: after passing the steel pipe according to user requirements for corrosion and coatings. 


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