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Material of steel pipe for submerged arc welding

Submerged arc welding steel pipe material: Q235A, Q23b, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, Q345 L245 L290 X42 X80 0Cr18Ni11Nb. X46 X70

1. Raw material, steel strip, welding wire, flux. Have to go through strict physical and chemical tests before they are put into the investment.

2. Strip head and tail docking, using single or double wire submerged arc welding, the steel tube rolled by automatic submerged arc welding welding.

3. Before molding, the strip passes through the leveling, trimming, planing, surface cleaning and conveying, and bending and handling.

4. By using the electric contact pressure gauge to control the pressure of the oil cylinder on both sides of the conveyor, the smooth delivery of the strip is ensured.

5. Outside control or internal control roll forming.

6. Using the welding gap control device to ensure that the weld gap meets the requirements of welding, the diameter of the pipe, the amount of the wrong side and the weld gap are strictly controlled.

7. In welding and welding are used in the United States Lincoln welding machine for single or double wire submerged arc welding, thereby obtaining the stable welding specification.

8. After welding, the welding seam is through the online continuous ultrasonic automatic inspection, to ensure that 100% of the spiral weld nondestructive testing coverage rate. If there are defects, automatic alarm and spraying marks, the production workers at any time to adjust the process parameters, timely elimination of defects.

9. The air plasma cutting machine to cut a single pipe.

10. Into a single tube, each batch of steel tube head three to strict inspection system first, chemical composition and mechanical properties of weld, inspection, blending, surface quality of steel pipe as well as a nondestructive inspection, to ensure that the process of good control, can be formally put into production.

11. There are continuous ultrasonic flaw detection of the site, after manual ultrasound and X ray review, if there are defects, after repair, once again after the non destructive testing, until the defects have been eliminated.

12. Strip butt weld and intersect with the spiral seam type joint in the tube, all through X ray TV or film examination.

13. After hydrostatic pressure test, the pressure of each pipe is sealed by radial. The test pressure and time are strictly controlled by the steel pipe water pressure computer testing device. Automatic print record of test parameters.


14. The pipe end machining, the end verticality, accurate control of slope angle and blunt edge.

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