The main process characteristics of spiral steel pipe:
1.the moulding process, the steel plate deformation is uniform, the residual stress is small, the surface does not produce scratches. Processed spiral steel pipe in the diameter and wall thickness of the size of the specification range has more flexibility, especially in the production of high steel grade thick-walled pipe, especially in small and medium diameter thick-walled pipe with other process incomparable advantages, can meet the user in the spiral steel pipe specifications more requirements.
2. Advanced double-sided submerged arc welding process can achieve welding in the best position, not easy to appear wrong edge, welding bias and welding defects, easy to control the welding quality.
3. The 100% quality inspection of steel pipe makes the whole process of steel pipe production under effective inspection and monitoring, which effectively guarantees the quality of products.
4. All equipments of the whole production line are equipped with the function of networking with the computer data collection system to realise the instant transmission of data, and the technical parameters of the production process are controlled by the central control room.
5. Raw materials, i.e. strip coil, welding wire and flux. All of them are subject to strict physical and chemical inspection before being put into production.
6. Strip steel is butt-jointed at the head and tail, and single-wire or double-wire submerged arc welding is used, and automatic submerged arc welding is used to make up the welding after it is rolled into steel pipe.
7. Before moulding, the strip steel undergoes levelling, edge trimming, edge planing, surface cleaning conveyance and pre-bending edge treatment.
8. Adopting electric contact pressure gauge to control the pressure of press down cylinder on both sides of the conveyor, which ensures the smooth conveyance of strip steel.
9. Adopt external control or internal control roll forming.
10. Weld gap control device is adopted to ensure that the weld gap meets the welding requirements, and the pipe diameter, the amount of wrong edge and weld gap are strictly controlled.
11. Using American Lincoln electric welding machine to carry out single-wire or double-wire submerged arc welding for both internal and external welding, so as to obtain stable welding quality.
