The production process of welded steel pipes includes steps such as cutting, chamfering, cleaning, docking, welding, polishing, etc. Among them, docking is one of the key steps, which requires the end faces of two steel pipes to be flat, vertical, and free of impurities and oxides. When welding, it is necessary to select appropriate welding methods and materials based on the material, wall thickness, diameter and other parameters of the steel pipe to ensure the quality and strength of the weld seam.
There are various types of welded steel pipes, including straight seam welded pipes, spiral welded pipes, galvanized pipes, etc. Straight seam welded pipe is a steel pipe that is bent into a tubular shape and connected at both ends by welding. Its advantages are low production cost and high production efficiency, but its disadvantage is that the weld seam is prone to cracks and pores. Spiral welded pipe is a steel pipe that rolls steel plates into a spiral shape and connects the spiral seams together through welding. Its advantages are good weld quality and high strength, but its disadvantages are high production costs. Galvanized pipes are coated with a layer of zinc on the surface of steel pipes to improve their corrosion resistance, and are commonly used in fields such as construction and pipelines.