Spiral steel pipes are made of steel coil by automatic submerged arc weld under normal atmospheric temperature. The double-sided submerged arc welding processing boasts not only in high deposition rate, but also with deep penetration ability, good quality and appearance of welding line and high density.
During manufacturing process of spiral steel pipe, steel plate has uniform deformation and light residual stress, thus the surface has no scratches. Spiral pipe has more flexible thicknesses and diameters, especially in making high-grade thick pipes with small or medium aperture.
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