Welded component comprising seamless bent pipe and seamless straight pipe sections and methods of manufacturing thereof

摘要

Provided are a seamless bend tube that has a bend section and straight tube sections on opposite sides of the bend section and in which the inner diameter of each straight tube section at its end is greater than the inner diameter of the bend section; a weld joint in which the inner diameter of an end of a seamless straight tube, which end is welded to either or both of the ends of the seamless bend tube, is the same as the inner diameter of the seamless bend tube and that has a seamless straight tube at either or both of the tube ends of the weld joint; and a method of producing the seamless bend tube and the weld joint. The seamless bend tube and the weld joint are suitable for a pipe line and can be obtained without unnecessarily increasing the wall thickness of the seamless bend tube and without cutting the tube ends of the seamless bend tube after it is produced.