Spiral steel pipe is a spiral steel pipe made of strip or coil formed in a spiral shape and welded with double-sided submerged arc active welding of the inner and outer seams, which can be widely used in the production of water, electricity, chemical industry and other professions for the following reasons: simply change the forming point of view, you can use the same width of the strip to produce a variety of caliber steel pipe, easy to adjust the shape.
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Because of the continuous zigzag forming, so the spiral pipe length of the fixed length is not bound, the length can be set at will. Welded spiral shape is evenly distributed throughout the circumference of the spiral pipe, so the spiral pipe has high scale accuracy and strength. Easy to change the scale, suitable for the production of small quantities and multiple types of spiral pipe.
Spiral steel pipe weld seam is longer than the weld seam of the same standard straight seam pipe, the same standard wall thickness, spiral steel pipe to accept the pressure is large. The disadvantage of the spiral steel pipe weld is “oblique disadvantage”. In the process of use, the main stress direction of the steel pipe, that is, the length of the equivalent shortcomings in the direction of the axis of the steel pipe is smaller than the straight pipe; secondly, because the pipeline steel are rolled steel, impact toughness has greater anisotropy, the CVN value of the rolling direction can be higher than the CVN value perpendicular to the rolling direction by 3 times.