The JCOE pipe making production line is an advanced manufacturing process used to produce high-quality longitudinally submerged arc welded (LSAW) pipes. The acronym “JCOE” stands for “J-ing, C-ing, O-ing, and E-ing,” which refers to the specific forming steps involved in the production process. This method is commonly employed to fabricate large-diameter, thick-walled pipes used in various industries, including oil and gas, construction, water transmission, and structural applications.
The JCOE pipe making production line typically consists of the following main components and stages:
The process begins with uncoiling steel coils, which serve as the raw material for pipe production. The steel coils are unwound and fed into the next stage of the production line.
In the forming stage, the steel coil is bent into a J-shape. This is achieved through a series of bending and preforming operations, gradually shaping the coil into the desired J configuration.
After forming the J-shape, the edges of the steel coil are pre-welded together. This creates a continuous strip that will form the longitudinal seam of the pipe.
4. Cold Bending and O-ing:
The next step involves cold bending and O-ing the pre-welded strip. The strip is formed into a circular shape with a constant outside diameter (OD). This process ensures consistent dimensions along the entire length of the pipe.
5. Internal Welding (I-ing):
Once the O-ing is completed, the pipe undergoes internal welding to create a smooth, continuous inside surface. This step is critical to ensuring the pipe’s structural integrity and optimal flow characteristics.
6. External Welding (E-ing):
After internal welding, the pipe is moved to the external welding station. Here, an automated welding process fuses the edges of the pre-welded strip, creating a high-quality, longitudinally welded seam along the pipe’s length.
7. Calibration and Sizing:
Following welding, the pipe undergoes a calibration process to achieve the desired outer diameter and wall thickness. Sizing rolls and mandrels are used to accurately control the pipe’s dimensions.
8. Ultrasonic Testing and Inspection:
To ensure the quality of the welded seam and detect any defects, ultrasonic testing is performed on the pipe. The pipe also undergoes visual and dimensional inspection to meet the specified quality standards.
9. Cut-off and End Beveling:
After passing the inspection, the pipe is cut to the required length. End beveling is then conducted to prepare the pipe ends for welding and fitting.
10. Hydrostatic Testing and Coating:
The final steps involve hydrostatic testing to check the pipe’s integrity against internal pressure and applying external coatings for corrosion protection.
The JCOE pipe making production line is renowned for its efficiency, accuracy, and ability to produce high-strength, large-diameter pipes. The automation and precision in this production process result in consistent and reliable pipes suitable for various applications in industries that demand high-performance steel pipes.