1. Mechanical cutting of thick-walled spiral steel pipes employs two methods: external and internal installation. Mechanical cutting uses a lathe tool to cut and bevel the pipe ends. It has a large single-machine span, can process large thicknesses, produces little waste, is pollution-free, and does not generate high temperatures, thus not affecting the pipe material and facilitating welding. Water jet cutting uses a high-pressure pump and diamond abrasive to process the pipe, resulting in clean cuts and a large processing span, but its efficiency is low, and the processing thickness is severely limited.
2. Oxy-acetylene flame cutting of thick-walled spiral steel pipes: By adjusting the oxygen and acetylene valves, the mixing ratio of oxygen and acetylene can be changed to obtain three different flames: neutral flame, oxidizing flame, and carburizing flame.
3. Plasma cutting of thick-walled spiral steel pipes: Plasma cutting, combined with different working gases, can cut various metals that are difficult to cut with oxygen cutting, especially non-ferrous metals (stainless steel, aluminum, copper, titanium, nickel). Its main advantages are that when cutting metals with a small thickness, plasma cutting is fast, especially when cutting ordinary carbon steel thin plates; the speed can reach 5 to 6 times that of oxygen cutting, the cut surface is smooth, the thermal deformation is small, and the heat-affected zone is small.
Post time: Dec-15-2025