Spiral steel pipes are primarily utilized in water supply projects, petrochemical industries, chemicals, power generation, agricultural irrigation, and urban construction. Their applications encompass liquid transportation (water supply and drainage), natural gas transportation (natural gas, steam, liquefied petroleum gas), and structural purposes such as for pile pipes and bridges, as well as in docks, roads, and building structures.
The key technological characteristics of spiral steel pipes include:
Uniform Deformation & Low Residual Stress: During the forming process, the steel plate undergoes even deformation with minimal residual stress and no surface scratches. The processed spiral steel pipes offer greater flexibility in diameter and wall thickness ranges, particularly in the production of high-grade thick-walled pipes, especially those with medium to small diameters, where they excel over other processes, fulfilling user requirements.
Advanced Double-Sided Submerged Arc Welding (DSAW) Technology: This ensures optimal welding positions, minimizing issues like edge errors, welding deviations, and defects, facilitating quality control.
Comprehensive Quality Inspection: To ensure effective detection and monitoring throughout the production process, 100% quality inspection is conducted on the steel pipes, thereby guaranteeing product quality.
Integrated Computer Data Collection System: All equipment along the production line is connected to a computer data acquisition system, enabling real-time data transmission and central control room management of technical parameters during production.
Rigorous Raw Material Inspection: Raw materials, including coils, wires, and fluxes, undergo stringent physical and chemical tests before use.
Automated Welding Repair: After stripping the steel head and tail butt joints, single- or double-wire submerged arc welding is employed. Once rolled into steel pipes, automatic submerged arc welding is performed for repair welding.
Preparation Before Forming: The steel strip undergoes leveling, trimming, planing, surface cleaning, transportation, and pre-bending prior to forming.
Electric Contact Pressure Control: Pressure on both sides of the conveyor is controlled using electric contact pressure gauges to ensure smooth steel strip transportation.
External or Internal Control Roller Shaping: Depending on requirements, external or internal control rollers are employed for shaping.
Welding Control Devices: These ensure that weld seams meet specifications, with strict control over pipe diameter, dislocation, and weld seams.
Stable Welding Quality: For consistent welding quality, Lincoln welders from the US utilize single- or double-wire submerged arc welding for both internal and external welding.
