摺動圧着接合法の創生とその基本的特性

— 熱間エンドレス圧延用バー接合への
固相接合方式の適用に関する研究 第1報 —

抄録

The endless hot rolling concept was introduced to meet the demand for diverse hot-rolled steel sheet products produced by a cost-effective process compared with the conventional batch-type process. Endless rolling involves joining the head and tail ends of two bars following their rough rolling. Previously, induction welding and laser welding have been employed in a hot mill line, nevertheless, these joining methods require a longer line space because of the long welding time. By applying solid-state joining utilizing the high temperature of the joined materials for endless hot rolling, a new joining technology was proposed to instantaneously obtain a sound and uniform joint as the base metal using relatively simple equipment. This report presents the friction joining method, in which one joined surface slides over the other surface to reduce the surface scale and each material is upset with friction to obtain a sound joint. In laboratory tests, the joint strength was approximately half that of the base metal and the joint area was very narrow. Obtaining a wide joint area without excessive scale is another problem that remains to be overcome.