Difference between erw and lsaw steel pipe
High-frequency welding straight seam steel pipe (ERW) production process is simple, a single production specifications. The double-sided submerged arc welding straight seam steel pipe (LSAW) production specification is complete, the plate can be customized in various sizes.Double-sided submerged arc welding straight seam steel production process before molding with JCOE process, complex molding process, forming efficiency relative to the low frequency welded pipe, so the manufacturing cost is higher than the high-frequency welding pipe joints straight. Straight double-sided submerged arc welding pipe joints using double-sided welding, ultrasonic plate probe pre-curved edge → Milling → ultrasonic testing of the JCO forming → pre-welding → welding → Weld → X-ray examination → expanding → hydrostatic test → X-ray examination chamfering → ultrasonic detection → Magnetic particle inspection of the pipe end → finished.
The high-frequency welded pipe used for conveying water, gas, air, oil and steam heating for low and medium pressure fluid pipe, structural steel tubing.Double submerged arc welding pipe joints straight for large span Wangjiagongcheng, water gas pipeline construction, power engineering, machinery, bridge beams, steel structure, foundation piling and other supporting facilities. In recent years the large steel structure with a large amount of straight seam steel pipe, generally focus on the requirement of double submerged arc weld pipe joints straight, steel pipe material, pipe bending performance.