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Double - sided submerged arc welding straight seam steel pipe
Oct 28, 2016

1. Plate exploration: used to manufacture large diameter submerged arc welded straight seam steel plate into the production line, the first full-board ultrasonic inspection;

2. Milling: through the edge milling machine on both sides of the double-sided milling, to achieve the required width, edge parallelism and groove shape;

3. Pre-bending: the use of pre-bending machine for pre-curved edge, so that the board has to meet the requirements of the curvature;

4. Forming: In the JCO molding machine first half of the pre-bent steel plate after several step stamping, pressed into "J" shape, and then the other half of the same steel plate bending, pressed into "C" shape, and finally the formation of openings Of the "O" shape

5. Pre-welding: the straight seam welded steel pipe after forming and the use of gas welding (MAG) for continuous welding;

6. Inside the welding: the use of vertical multi-wire submerged arc welding (up to five wire) in the straight seam steel pipe welding;

7. Outer welding: using longitudinal multi-wire submerged arc welding in the straight seam submerged arc welded steel pipe outside;

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

9. X-ray examination Ⅰ: 100% of the internal and external weld X-ray industrial television inspection, the use of image processing systems to ensure the detection sensitivity;

10. Expanding: the submerged arc welded straight seam steel pipe diameter to expand the diameter to improve the dimensional accuracy of steel pipe, and to improve the distribution of stress in the steel pipe.