SSAW Pipe Supplier-GNEE
The welded and processed spiral steel pipe feeds the strip into the welded pipe unit. After rolling through several rolls, the strip is gradually coiled into a round pipe billet with an open gap. The reduction of the compression rolls is adjusted to control the weld gap to 1~3mm and to make the ends of the welded joint flush.
1. If the gap is too large, the proximity effect will be reduced, the eddy current heat will be insufficient, and the crystal joint of the weld will have a poor joint, resulting in non-fusion or cracking.
2. If the gap is too small, the proximity effect will be increased and the weld heat will be excessive, which will lead to weld burns; otherwise, a deep crater will be formed in the weld after extrusion and rolling, which will affect the surface quality of the weld.
After the two edges of the billet are heated to the welding temperature, under the extrusion rolls, common metal grains are formed in order to penetrate and crystallize each other, and finally a strong weld is formed. If the squeezing force of the spiral steel pipe is too small, the number of co-crystals formed becomes smaller, the strength of the weld metal decreases, and cracks will occur when the force is applied. If the squeeze force is too large, the molten metal will be extruded from the weld. Not only reduces the welding strength, but also produces a large number of internal and external burrs, and even causes defects such as weld overlap.
- The main technical characteristics of spiral steel pipe:
A: During the forming process, the steel plate is uniformly deformed, the residual stress is small, and the surface does not produce scratches. The processed spiral steel pipe offers greater flexibility in the size and specification range of diameter and wall thickness, especially in the production of high-grade steel grade thick-walled pipes, especially small and medium diameter thick-walled pipes. It has advantages that cannot be matched by other processes and can satisfy users. There are more requirements for spiral steel pipe specifications.
B.Adopting advanced double-sided submerged arc welding technology, it can realize welding in the best position, which is not easy to have defects such as edge error, welding deflection, incomplete penetration, etc., and it is easy to control the welding quality.
C.100% quality inspection of steel pipe, so that the whole process of steel pipe production is effectively inspected and monitored, effectively guaranteeing the quality of products.
D. All equipments of the whole production line have the function of networking with computer data collection system to realize instant data transmission and control the technical parameters in the production process from the central control room.
