... 100M/min 5.CE High Frequency Aluminium Pipe making machineDevice principle: high-frequency welding steel pipe mill ... butt cut, hopper, steel straightening, steel forming, high-frequency welding, to outer burr, cooling, pipe sizing, ... .2 Roller System of Forming 3.3 Seam Guide 3.4 High Frequency Induction Welding Machine ... 3.5 Roller System for Moving 3. ...