| 摘要 |
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 ).
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