Using double-sided spiral submerged arc spiral pipe welding technology, the narrowband ( board ) volume continuous welded steel pipe. In our natural gas and other long-distance gas pipeline project has been widely used, which is our long-distance gas pipeline project using the main tube. Spiral welded pipe are widely used in natural gas, petroleum, chemical, electric power, heat, water, steam heating, hydropower penstock, power, water and other long-distance pipelines and piling, dredging, bridges, steel and other engineering fields.
Double spiral submerged arc welded steel tube mill will be fed into the strip, the multi-channel roll rolling, gradually rolled strip steel, formed with an opening gap round tube, adjust the amount of reduction squeeze rollers, so that the weld clearance control at 1 ~ 3mm, and to flush the weld ends. Spiral welded pipe forming machine is the raw material strip spiral shape, through internal and external submerged arc welding, which produce different specifications of the spiral welded pipe. Double spiral submerged arc welded pipe production process is simple, medium and large diameter pipe with operating costs low, with the advantage of low-cost operation, low pressure in the large-diameter pipes, heat pipe and piling pipe market has a price advantage.
Spiral Pipe thermal fatigue stability generally refers to work in hot and cold alternating cracks under the action of the ability to resist. Of cold, heat generated by alternating said thermal fatigue crack crack. In the mold die casting, forging die thermal fatigue scrapped mainly due to poor stability are prone to thermal fatigue cracking. For the mold steel, its stability is mainly determined by the thermal fatigue toughness and strength. Therefore, stability, good thermal fatigue mold steel must have good toughness and high strength ( wet strength ) a good fit. Spiral welded tube surface by high velocity impact and turbulence of the fluid -like, and to abrasion and corrosion damage, known corrosion and wear. Impact corrosion is the main form of wear and corrosion resistance. Spiral steel tube under the impact of high-speed fluid, the protective film damage, break at the bare metal accelerate corrosion. If the fluid contains solid particles, spiral steel pipe corrosion and wear is even more serious. Its exterior features are: localized grooves, corrugated, round and valleys shaped, usually show directionality. Exposed to the movement of fluid in equipment such as: pipes, tees, valves, blowers, centrifuges, impellers, heat exchangers, exhaust duct, etc. can have an impact corrosion. Soft metals such as copper and lead more serious.
