Brief introduction of double-sided submerged arc welding spiral steel pipe

Brief Introduction and Industrial Application of Double-sided Submerged Arc Welded Spiral Steel Pipe

Spiral pipe, also known as spiral pipe or spiral welded pipe, is a double-sided submerged arc welding spiral pipe, which coils low carbon structural steel or low alloy structural steel strip into billet according to a certain helix angle (called forming angle), and then welds the pipe seam. It can produce large diameter steel pipe with narrow strip steel.

Biology

Also known as spiral barrel or spiral body. The outer diameter of the helical tube is about 30 nanometers, the inner diameter is about 10 nanometers, and the adjacent helical spacing is about 11 nanometers. The helical tube is surrounded by six nucleosomes every week. H1 histone is located on the inner surface of the helical lumen and plays an important role in maintaining the helical tube structure. The 10-nanometer fibers consisting of nucleosomes spiralized to form 30-nanometer coarse fibers, which further compressed the length of DNA six times.

Industrial pipe

Double-sided submerged arc welding spiral steel pipe spiral pipe is mainly used for oil and natural gas transmission pipeline, its specification is expressed by outer diameter * wall thickness. The spiral pipe has one-sided welding and two-sided welding. The welded pipe should ensure that the hydraulic test, tensile strength and cold bending performance of the weld meet the requirements.