| 摘要 |
PURPOSE:To obviate the formation of inter-surface oxide films and to make possible the satisfactory welding of a pair of steel bars by pressurizing a plate- shaped insert material which is disposed between the end faces of a pair of the heated steel bars, is made of approximately the same material as the steel bars and is at the temp. higher than the steel bars so as to flow plastically between the end faces. CONSTITUTION:The plate-shaped insert material 2 which is made of approximately the same material as the steel bars and is heated to about 1,400 deg.C in another furnace is disposed between the preceding stee bar 1 which is heated to about 1,100 deg.C in a heating furnace of a production line and is ejected from the furnace and the succeeding steel bar 1 while both end faces are kept descaled. A pair of the steel bars 1 are pressed face to face to each other and are heated up to about 1,450 deg.C at which the insert material is not melted, by a high-frequency coil 3. A pair of the steel bars 1 are pressed by a suitable method, by which the material 2 is plastically fluidized and the inter-surface oxide films are destructed and removed to join satisfactorily a pair of the steel bars 1. The joined steel bar is efficiently and continuously rolled by the succeeding rolling device.
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