| 摘要 |
PURPOSE:To perform thorough press welding and to reduce cost by cutting the end of the plates to be joined respectively to a projecting shape and a corresponding recessed shape at the prescribed radius of curvature then butting the cut faces via a flux and hot rolling the plates. CONSTITUTION:The tail end of the preceding plate material B and the top end of the succeeding plate material A are cut to the arc shape having the radius of curvature of 2-3 times the plate width by a drum shear. The flux consisting of silica sand, etc. is sprayed to the cut surfaces and the ends of the materials A, B are butted to each other by pushing forward the material A by pinch rolls PR. The materials A, B are then fed to the 1st stand of a finishing mill by the rolls PR and are hot rolled by work rolls 3. The joint surfaces S are rolled in this stage, by which the plate materials A, B are thoroughly press-welded. Since the butt part is arc shaped, the joining position in the transverse direction of the plate is different in the roll bite and the rupture of the joint surfaces is prevented. The thorough joining and the reduction of the cost are thus made possible. |
