Preliminary treatment of straight seam steel pipes: non-destructive testing inside the weld. Since this pipe is an extra-large steel pipe in the water supply project, especially the steel pipe with a thickness of t=30mm is used as a pipe bridge, it must withstand both the internal water pressure and the burden. The bending moment formed by the weight of the steel pipe and the water body makes the requirements for welding particularly high. For large-diameter steel pipes with a thickness of t=30mm used in pipe bridges, both their longitudinal and circumferential seams belong to the first category of welds, requiring 100% X-ray inspection and 100% wave detection inspection; while for thickness t= For 24mm buried steel pipes, the longitudinal seams belong to Category I welding, and 20% X-ray inspection and 50% wave detection inspection are carried out.
Uses of straight seam welded pipes: There are many types of straight seam welded pipes, according to their uses: general welded pipes, oxygen blown welded pipes, galvanized welded pipes, wire casings, roller pipes, metric welded pipes, automotive pipes, deep well pump pipes, transformer pipes, electric welding special shapes Pipes, welded thin-walled pipes.
General welded pipe: General welded pipe is used to transport low-pressure fluid. Made of Q235A, L245, Q235B steel.
Galvanized steel pipe: It is to coat the surface of the black pipe with a zinc layer. Divided into hotness and coldness. The hot zinc layer is thick and the cold temperature is cheap.
Oxygen-blown welded pipe: Generally a small diameter welded steel pipe, commonly used for oxygen blowing in steelmaking.
Wire casing: It is a pipe for a power distribution structure, which is an ordinary electric welded carbon steel pipe.
Electrically welded thin-walled tube: It is a small-diameter tube used for furniture and lamps.
Idler tube: Electrically welded steel tube on the belt conveyor, with required ovality.
Transformer tube: It is an ordinary carbon steel tube. Used in the manufacture of transformer heat pipes and other heat exchangers.
Post time: Dec-18-2023