<p>A metal pipe connecting structure consists of a pipe body (1) and a pipe joint (2). One end of the pipe body (1) is fitted into the pipe joint (2). An external bead (3) is formed near the end of the pipe body (1) and has a regular or an irregular curved face. A seal ring (4) is mounted on the side of the external bead (3) which is close to the opening of the pipe body (1), and a coupling member (6, 8) on the pipe body (1) is positioned on the other side of the external bead (3). A shoulder hole (5) is positioned in the inner wall of the pipe joint (2) which is corresponded to the seal ring (4). The end face of the pipe joint (2) is connectedto the junction member (6, 8) on the pipe body (1).</p>
