Spiral steel tubes are primarily applied in water supply projects, petrochemical industries, chemical industries, power industries, agricultural irrigation, and urban construction, ranking as one of the twenty key developed products. They serve various purposes: for liquid transportation (water supply and drainage), gas transmission (gas, steam, liquefied petroleum gas), and structural uses such as piling pipes, bridges, docks, roads, and construction pipes.
Key Process Characteristics of Spiral Steel Tubes:
During the forming process, the steel plate deforms uniformly with minimal residual stress, leaving no scratches on the surface. The spiral steel tubes processed exhibit greater flexibility in terms of diameter and wall thickness specifications, especially when producing high-grade thick-walled pipes, particularly those with medium and small diameters, offering unmatched advantages over other processes and satisfying diverse customer requirements for spiral steel tube specifications.
The adoption of advanced double-sided submerged arc welding technology enables welding in optimal positions, minimizing defects like misalignment, welding deviation, and incomplete penetration, thereby facilitating welding quality control.
100% quality inspection is conducted on steel tubes, ensuring that the entire production process is under effective detection and monitoring, which significantly guarantees product quality.
All equipment along the production line is capable of connecting to a computer data acquisition system, enabling real-time data transmission and centralized control of technical parameters during production by the central control room.
Raw materials, including steel coils, welding wires, and fluxes, undergo rigorous physical and chemical inspections prior to use.
The head and tail of the steel strip are butt-welded using single- or double-wire submerged arc welding, followed by automatic submerged arc welding for repair after rolling into a steel tube.
Prior to forming, the steel strip undergoes leveling, trimming, edge planing, surface cleaning, conveying, and pre-bending processes.
An electric contact pressure gauge is employed to control the pressure of the hydraulic cylinders on both sides of the conveyor, ensuring stable steel strip transportation.
Both external and internal roll forming methods are utilized.
Weld gap control devices are adopted to ensure that the weld gap meets welding requirements, with strict control over pipe diameter, misalignment, and weld gap.
Both internal and external welding employ Lincoln Electric single- or double-wire submerged arc welding machines from the US, ensuring consistent welding quality.
