difference between LSAW pipes and Erw Steel Pipe
1, the production process
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.
Straight seam steel pipe is a steel pipe weld, the weld has a long or short, but it must be a weld, according to the sheet length, thehigh-frequency Welded Steel Pipe a weld can be done 14 meters,
double-sided submerged arc welding straight seam steel pipes a weld can be done up to 12.8 meters, nails welded steel pipe due to width restrictions on a weld can be produced up to 2.2 meters.
Straight seam steel pipe of the test items divided into: Chemical composition, tensile test, bend test, flattening test, guided bend test, hydraulic test, resistance welding pipe ultrasonic testing, ultrasonic
testing of the SAW pipe, eddy current testing-ray detection testing. Inner and outer surfaces of the steel pipe should be smooth, not allowed to fold, cracks, delamination, lap welding, break arc, burn and other
depth than the wall thickness deviation defects. Allows the depth does not exceed the deviation of the other local defects.
The high-frequency welded pipe used for conveying water, gas, air, oil and steam heating for low and medium pressure fluid pipe, structural
Double submerged arc welding pipe joints straight for 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.