| 摘要 |
<p>A method of manufacturing a tubular structure such as a clad pipe (10) having inner and outer pipe sections (11, 13) with an interference fit therebetween and also a clad pipe (10) manufactured in accordance with that method. The method comprises the following steps: (a) positioning two pipe sections one within the other to provide an assembly (15) comprising the inner pipe section (11) and the outer pipe section (13); (b) radially expanding a portion of the inner pipe section (11) into engagement with the surrounding portion of the outer pipe section (13) using an expansion tool (17); (c) continuing to radially expand said portion of the inner pipe section (11) to plastically expand said portion of the inner pipe section (13) and elastically expand the surrounding portion of the outer pipe section (13); and (d) repeating steps (b) and (c) for one or more further portions of the inner pipe section (11). Because the inner pipe section (11) is radially expanded into a condition which it undergoes plastic deformation and the outer pipe section (13) is radially expanded to undergo elastic but not plastic deformation, interference between the inner and outer pipe sections is achieved due to the residual tensile stress in the outer pipe section (13) and the residual compression stress in the inner pipe section (11). The method may also involve establishing a metallurgical bond between the confronting surfaces of the two pipe sections (11, 13).</p> |
