LSAW Steel Pipe Technical Characteristics And Process Flow

LSAW Steel Pipe Technical Features1. In the process of steel tube forming, the steel plate is uniformly deformed, the residual stress is small, and the surface is free of scratches. The processed steel pipe has greater flexibility in the size range of steel pipe diameter and wall thickness, especially in the production of high steel grade thick-walled steel pipe, especially in large-caliber thick-walled pipe, which has other advantages unmatched by other processes and can be satisfied. Users have more requirements on steel pipe specifications.

1. Conduct 9 items of 100% quality inspection on the steel pipe, so that the entire process of steel pipe production is under effective detection and monitoring, which effectively ensures the quality of SAW pipe products.
2. the overall mechanical expansion, can effectively improve the dimensional accuracy of the steel pipe, and improve the distribution of the internal stress of the steel pipe, so as to avoid damage due to stress corrosion, and at the same time conducive to the on-site welding construction.
3. Using the pre-welding inside and outside the welding (finishing welding) process, can achieve the best position to weld, not easy to appear the wrong side, welding bias and incomplete penetration and other defects, easy to control the quality of welding.

5. The entire equipment of the entire production line has the function of networking with the computer data acquisition system, realizing the data transmission in real time, and the quality of the technical parameters and quality indicators in the production process will be collected by the central control room.SSAW Steel Pipe Process InventoryMilling edge: Through the edge milling machine, the two edges of the steel plate are double-sided milled to achieve the required plate width, plate edge parallelism and groove shape.Pre-bend: pre-bending machine using pre-bending, so that the edge of the board has a satisfactory curvature.

Forming: In the JCO molding machine, first half of the pre-bent steel plate is punched several times and pressed into a "J" shape. Then, the other half of the steel plate is also bent and pressed into a "C" shape to form an open end." O" shape.

Pre-welding: After the forming of the steel pipe joints and continuous welding with gas shielded welding (MAG).Internal welding: Welding in the inside of straight seam steel pipe using multi-wire submerged arc welding (up to four wires)Outer welding: Use multi-wire submerged arc welding on the outside of the spiral submerged arc welded steel pipe.Ultrasonic inspection I: 100% inspection of the internal and external welds of the spiral steel pipe and the base metal on both sides of the weld.

X-ray inspection I: 100% X-ray industrial television inspection of internal and external welds, using image processing systems to ensure detection sensitivity;Expanded diameter: The full length of the straight seam steel pipe is expanded to increase the dimensional accuracy of the steel pipe, and the distribution of the internal stress of the steel pipe is improved.

Hydraulic pressure test: The root diameter of the expanded steel pipe is tested on the hydrostatic testing machine to ensure that the pipe meets the required test pressure. The machine has automatic recording and storage functions;Chamfering: the qualified steel pipe is pipe-end processed to meet the required pipe-end groove size.

Ultrasonic inspection II: Ultrasonic inspection was performed one by one to check for possible flaws in the longitudinal welded steel pipe after diameter expansion and water pressure.

X-ray inspection II: X-ray industrial television inspection and tube-end weld seam inspection of steel pipes after diameter expansion and hydraulic pressure testing;Tube end magnetic particle inspection: This inspection is performed to find the tube end defects.Anti-corrosion and coating: The qualified steel pipe is anti-corrosion and coating according to the user's requirements.

A worker from a steel pipe company, which is located in China.