Abstract: A piping joint that enables welding without back shielding and without oxidized scaling on the pipe's inner surface. A piping joint has an inner fitting portion formed around the circumference of an end of a first tubular material, and a first bevel is formed on the radial outside of the inner fitting portion around the circumference. An outer fitting portion, fitted to the radial outside of the inner fitting portion, is formed on the end of a second tubular material butt welded to the first tubular material, and a second bevel is formed around the circumference at the end of the outer fitting portion facing the first bevel. The cross-section of the face of the inner fitting portion located on the radial outside, and the cross-section of the face of the outer fitting portion located on the radial inside, are completely round with a constant circumferential curvature.

Abstract: An object is to provide a piping joint structure that enables welding without back shielding, and in which oxidized scale does not occur on the inner surface side of the pipe.