Strailed steel pipes are a kind of welding steel pipe. Refers to the steel pipes of the vertical parallel of the weld and the steel pipe. After the hot -rolled steel roll meridian is formed, the steel roll is transformed into cylindrical shape. The arc combustion effect of the high -frequency current skin and the neighboring effect or the neighboring effect or the neighboring effect or the arc under the waee layer can be welded, so that the edge of the pipe billet is heated and melted, melted, and eventually cooled. Yes. Petroleum, metallurgy, construction, coal mines, ports, machinery and other industries are widely used in industries such as oil and gas transportation, low -pressure water and gas transportation, mine fluid transportation, band conveyor, and automotive transmission shafts.
Production process of straight stitched steel pipes
1. Steel plate detection: Before the steel plate processing, it will perform ultrasound detection to effectively prevent unqualified steel plates entering the production line;
2. Placement: Mill the edges of the steel plate by milling machine to milling. Because the variable diameter is large and small, the steel plate is also wide and narrow after the material, so that it can achieve the width of the steel plate and the edge of the plate. Parallelism and hill -mouth shape;
3. Pre -bending: Use the pre -bending machine for pre -bending on the edge of the board, meet the requirements of curvature, and the thickness of the thickness can be used for pre -bending.
4. For molding: First of all, half of the steel plates after the pre -curved steel plate are crushed multiple times to make it a "J" shape, and then the other half of the steel plate is performed in the same operation, which is pressed into a "C" shape. "O" shape
5. Pre -welding: After the molding, the pile straight seam steel pipe will be welded with second guarantee welding
6. Internal welding: Use the vertical column -wire buried arc welding (up to four wires) on the inner side of the large -diameter welded pipe factory;
7. External welding: Use the columns to bury the arc welding in the pile straight seam steel pipe for welding.
8. Repair: Repair the steel pipes of the whole root welding machine to ensure the accurate size required by the customer and improve the distribution status of the stress in the steel pipe;
9. Detection: For the client's requirements, the straight seam steel pipe of the pile is performed by ultrasonic tube or X -ray detection, hydraulic pressure test, and can also be carried out.
