Limestone Quarry Plant

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QCCO was approved as a member of “China Association for Contracting Projects Abroad “and granted a membership certificate on Sep 28,2005; “Credibility Rating AAA certificate in Foreign Trade” was granted to QCCO by China Shippers’ Association


Construction Technology of steel pipe for communication tower

Construction Technology of steel pipe for communication tower

2. Milling edge: Through the milling machine to the two edges of the steel plate milling, to achieve the required plate width, plate edge parallelism and groove shape;

3. Pre-bending edge: The bending machine is used to bend the edge of the plate so that the edge of the plate has the curvature that conforms to the requirement;

4. Forming: In the Jco molding machine first will be curved after half of the steel plate after several steps into stamping, pressure into the "J" shape, and then the other half of the steel plate is also bent, pressure into the "C" shape, and finally formed the opening of the "O" shape

5. Pre-Welding: Make the communication tower after the formation of steel pipe joint and the use of gas shielded welding (MAG) for continuous welding;

6. Internal welding: The use of longitudinal multi-wire submerged arc welding (up to four wire) in the communication tower with the inside of steel pipe welding;

7. External welding: The use of longitudinal multi-wire submerged arc welding in the communication tower with the outer side of the steel pipe welding;

7.2. Plate probe: Used to make large-diameter submerged arc welding communication tower steel plate into the production line, first of all the ultrasonic inspection;

8. Ultrasonic inspection Ⅰ: To the communication tower steel pipe inside and outside the weld and weld both sides of the base material for 100% inspection;

9. x-ray inspection Ⅰ: 100% x-ray Industrial TV inspection of internal and external welds, using image processing system to ensure the sensitivity of flaw detection;

10. Enlarging diameter: The full length of the steel pipe for the submerged arc welding Communication tower is enlarged to improve the dimensional accuracy of the steel pipe and to improve the distribution of the stress in the steel pipe;

11. Water pressure test: On the hydraulic testing machine for the steel pipe after the expansion of the root test to ensure that the steel pipe to meet the standard requirements of the test pressure, the machine has automatic recording and storage functions;

12. Chamfering: The pipe end is processed by the qualified steel pipe to reach the required pipe end groove size;

13. Ultrasonic inspection Ⅱ: Again by the root of the ultrasonic test to check the communication tower steel pipe in the expansion, water pressure may produce defects;

X-Ray Inspection Ⅱ: X-ray Industrial television inspection and pipe end weld filming of steel tubes after expanding and hydrostatic tests;

15. The Tube end Magnetic particle inspection: Carries on this examination to discover the tube end flaw;

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