JOINING METHOD FOR STEEL BARS

摘要

PURPOSE:To press-weld satisfactorily steel bars by inserting and pressing respectively the ends of the steel bars to be joined into the hole part of a cylindrical metallic member heated to the temp. higher than the temp. of the steel bars and rolling the entire part in this state so that the ends of the steel bars are not bulged and detached by restraint. CONSTITUTION:The ends of the steel bars 2 to be joined are descaled and are inserted and pressed into the hole part 3 of the cylindrical metallic member 1 which is heated to the temp. higher than the steel bars 2 and is made of approximately the same material as the material of the steel bars. The entire part is rolled in this state, then the member 1 fits well to the bars 2 and the steel bars are press-welded. The ends of the steel bars 2 are thus satisfactorily press-welded without bulging and detaching. The steel bar having the joint part joined to the same size is thus obtd.