Spiral tube is divided into single-sided welding double-sided welding

Spiral tube: It is a low-carbon carbon structural steel low-alloy structural steel steel strip that is rolled into a tube blank at a certain spiral angle (called forming angle). Liaoning spiral tube is then welded to the tube seam. It can be used Narrow strips produce large-diameter steel pipes. Spiral pipes are mainly used for oil natural gas pipelines, their specifications are expressed by outer diameter * wall thickness. There are single-sided welding double-sided welding of the spiral tube. The welded tube should ensure the hydrostatic test, the tensile strength of the weld the cold bending performance to meet the regulations.