1.High Frequency Aluminium Pipe making machine 2.Diameter :16-32mm ... 30-100M/min 5.CE High Frequency Aluminium Pipe making machineDevice principle: high-frequency welding steel pipe mill is ... into a steel tube, and then use high-frequency proximity effect and skin effect heating the ... steel butt cut, hopper, steel straightening, steel forming, high-frequency welding, to outer burr, cooling, pipe sizing, ...