Wholesale LSAW Steel Pipe, Large Diameter Welded Steel Pipe_Hebei Haiqianwei Steel Pipe CO.,LTD

JIS standard Longitudinal Submerged Arc welding Steel Pipe
American Standard carbon steel pipe
EN standard Longitudinal Submerged Arc welding Steel Pipe
API 5L PSL1 Longitudinal Submerged Arc welding Pipeline

Big straight seam welded pipe main production process

Oct 27, 2018

Agent: 1. The plate used in the manufacture of large diameter submerged-arc welding straight seam steel pipe, steel plate into the production line after the first full plate ultrasonic inspection;


2. The edge milling: through the two edges of the steel plate edge milling machine double-sided milling, make it meet the requirements of plate, plate edge parallelism and groove shape;


3. The bending edge: the use of bending machine for plate bending, make the edge of curvature;


4. Molding: on the JCO forming machine bending of the plate after half after many step punching, pressure into a "J" shape, and the other half of the steel plate bending, same pressure into a "C" shape, eventually forming the opening "O" shape.


5. Early welding: the forming of straight seam welded steel pipe joint with gas protection welding and continuous welding (MAG);


6. The welding: the columns more wire submerged arc welding wire (up to 4) in the straight seam welded steel pipe inside;


7. The welding: adopting many wire submerged arc welding of columns in the side of straight seam submerged arc welding steel pipe welding;


8. Ultrasonic inspection Ⅰ: inside and outside of straight seam welded steel pipe weld and weld on both sides of the base of 100% of the check;


9. X-ray Ⅰ: 100% of inside and outside weld X-ray industrial TV inspection, using image processing system to ensure the sensitivity of detection;


10. Hole enlargement of submerged arc welding and straight seam steel pipe length hole diameter in order to improve the size precision of steel tube, and improve the distribution of stress in steel tube.

ABOUT US
Our company uses the most advanced technology of JCOE LSAW steel pipe manufacture in the world wide, specialized in producing heavy calibre LSAW steel pipe. The product line adopts PID automatic controlling continuous J-C-O forming technology, and the advantages of the product line are as below: high speed, high quality, low stress distribution, and low tolerance of size.
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TEL : +86-0317-6091369/6091199/8526088/8526080/8526070/
8526076/8526096/8526085/8526078/8526095

Fax Number : +86-0317-6091368

Website : www.hqwsteelpipe.com

E-MAiL : bright@hspc.cc

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