Galvanized steel pipe is a kind of hollow square section light-weight thin-walled steel pipe, also known as steel refrigeration bending section. It is made of Q235 hot-rolled or cold-rolled strip or coil as base material by cold bending, forming and high frequency welding. Hot-rolled extra-thick wall galvanized steel pipes have corner size and flatness beyond resistance welding cold-formed galvanized steel pipes except for wall thickness thickening. MAIN WELDING TECHNOLOGY OF GALVANIZED STEEL TUBES
Welded galvanized steel pipe with narrower billet consumes larger diameter welded pipe, and can consume welded pipe with different diameter with the same width billet. However, compared with the straight galvanized steel pipe with the same length, the length of the weld increases by 30-100%, and the consumption rate is lower.
Welded galvanized steel pipes with large diameter or thicker thickness are usually directly made of steel billet, while thin-walled welded pipes with small welded pipes only need to be directly welded through steel strips. Then after a simple polishing, wire drawing can be done. Therefore, most of the smaller diameter welded pipes are welded by straight seam welding, while the larger diameter welded pipes are mostly welded by spiral welding. It has good mechanical properties, weldability, cold, hot working and corrosion resistance, and good low temperature toughness.
Galvanized steel pipe has the advantages of simple consumption process, high consumption efficiency, low cost and rapid development. The strength of spiral welded pipe is generally higher than that of galvanized steel pipe. It can consume welded pipe with bigger diameter with narrower blank and welded pipe with different diameter with the same width blank. However, compared with the straight seam pipe of the same length, the length of the weld increases by 30-100%, and the consumption rate is lower.
Therefore, the smaller diameter galvanized pipes are mostly welded by straight seam, while the larger diameter galvanized pipes are mostly welded by spiral galvanized pipes, which can be divided into round pipes and special-shaped pipes according to the shape of cross-sectional area. Because the circle area is the largest under the condition of equal circumference, more fluid can be delivered by the circular tube. In addition, when the circular section receives the internal or external radial pressure, the force is relatively average, so most of the steel tubes are circular tubes.
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