Weld processing
The spiral steel pipe feeds the strip into the welded pipe unit, and after rolling through multiple rolls, the strip is gradually rolled up to form a circular tube blank with an open gap, and the pressing amount of the pressing roll is adjusted, so that the weld gap is controlled at 1~ 3mm and make the ends of the solder joints flush.
1. If the gap is too large, the proximity effect is reduced, the eddy current heat is insufficient, and the weld intergranular joint is poor and unfused or cracked.
2. If the gap is too small, the proximity effect will increase, the welding heat will be too large, and the weld will be burnt; or the weld will be pressed and rolled to form a deep pit, which will affect the surface quality of the weld.
After the two edges of the tube blank are heated to the soldering temperature, under the extrusion of the pressing roller, a common metal grain is formed to infiltrate and crystallize, thereby finally forming a firm weld bead. If the pressing force of the spiral steel pipe is too small, the number of common crystals will be small, the strength of the weld metal will decrease, and cracking will occur after the force is applied; if the pressing force is too large, the molten metal will be extruded out of the weld. Not only the weld strength is reduced, but also a large number of internal and external burrs are generated, and even defects such as weld seams are caused.
Process characteristics
The main process characteristics of spiral steel pipe:
a. During the forming process, the steel plate is deformed evenly, the residual stress is small, and the surface is not scratched. The processed spiral steel pipe has greater flexibility in the size and thickness range of the steel pipe, especially in the production of high-grade thick-walled pipes, especially small and medium-diameter thick-walled pipes, which have advantages over other processes and can satisfy users. More requirements on the specifications of spiral steel pipe.
b. Adopt advanced double-sided submerged arc welding technology to achieve welding at the best position, and it is not easy to have defects such as wrong side, welding deviation and incomplete penetration, and it is easy to control the welding quality.
c. 100% quality inspection of steel pipes, so that the whole process of steel pipe production is under effective inspection and monitoring, which effectively guarantees product quality.
d. All equipment of the entire production line has the function of networking with the computer data acquisition system to realize real-time data transmission, and the technical parameters in the production process from the central control room.
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Label: Process characteristics of spiral steel pipe
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