HF ERW tube mill 

New brand/Used ERW tube mill Working principle Steel tube of high frequency welding is using the skin effect of alternating current (AC) and adjacent effect, steel strip after rolling forming, the information of a cross section of broken circular tube billet, in the middle of tube billet inside near the induction coil rotating around one or a set of impedance, Impedance and tube billet was reluctant to form an electromagnetic induction loop, under the action of skin effect and the adjacent effect. A strong and concentrated thermal effect is produced at the edge of the opening of tube billet, which makes the edge of weld rapidly heated of the temp erature required of welding. After extrusion by the press roller, the metal in the molten state realizes indirect crystallization and forms a firm butt weld after cooling. Machine model # Model Diameter(mm)…