What is double-sided submerged arc welded steel pipe?
Double-sided submerged arc welding steel pipe is a kind of steel pipe made by double-sided submerged arc welding process. Specifically, the welding process of this kind of steel pipe is submerged arc welding on the inside and outside of the steel pipe at the same time to ensure the integrity and quality of the weld. The following is a detailed explanation of double-sided submerged arc welding steel pipe:
一,welding technology
Submerged arc welding: Submerged arc welding is a welding method in which the arc burns under the flux layer, with stable and reliable welding quality, high welding efficiency and beautiful weld formation. In the production of double-sided submerged arc welding steel pipe, the welding wire is continuously sent to the welding area through the automatic wire feeding device, and melted with the base metal of the steel pipe under the protection of flux to form a weld.
Double-sided welding: Compared with single-sided welding, double-sided welding can significantly improve the strength and sealing of weld. In the double-sided submerged arc welded steel pipe, the weld is not only formed on the outside, but also on the inside, thus achieving comprehensive weld coverage.
二,Product features
High strength: due to the use of high-quality steel and advanced welding technology, double-sided submerged arc welded steel pipes have high tensile strength and yield strength.
Good sealing performance: The welded seam of double-sided welding has compact structure and no defects such as air holes and slag inclusion, which ensures the sealing performance of the steel pipe.
orrosion resistance: according to user's requirements, the surface of steel pipe can be treated with anti-corrosion treatment, such as zinc plating and plastic coating, to improve its corrosion resistance.
High dimensional accuracy: strict dimensional control and inspection are carried out in the production process to ensure that the dimensional accuracy of steel pipes meets the design requirements.
三,application area
Double-sided submerged arc welded steel pipes are widely used in many fields because of their excellent properties:
Architectural field: It is used for load-bearing columns, beams and other parts in building structures, and meets the design requirements of various shapes through cold bending.
Bridge engineering: As the supporting structure and guiding system of the bridge, it has good bearing capacity and seismic performance.
Petrochemical industry: used for conveying oil, natural gas and other fluids, to meet the curve requirements in the pipeline laying process and improve the stability and sealing of the pipeline.
四,the production process
The production process of double-sided submerged arc welded steel pipe usually includes the following steps:
Preparation of raw materials: select qualified steel as raw materials. Forming: the raw steel is processed into a tube blank with a certain shape by a forming machine.
Pre-welding: Pre-welding the tube blank to prepare for the subsequent submerged arc welding.
Double-sided submerged arc welding: submerged arc welding is carried out at the inner and outer sides of the tube blank at the same time.
Weld inspection: ultrasonic and X-ray inspection shall be carried out to ensure the weld quality.
Follow-up treatment: including expanding, hydrostatic test, anti-corrosion treatment and other steps to improve the performance and service life of steel pipes.
To sum up, double-sided submerged arc welded steel pipe is a kind of steel pipe product with excellent performance and wide application.
