| 摘要 |
<p>The invention provides a method for expanding a pipe 10 at a predetermined location therealong by positioning a conductive wire 11 at the required location and rapidly discharging a known electrical charge through the wire to explode, thereby initiating a shock wave of known energy which expands the pipe 10 plastically by a controlled amount. As applied to the repair of a pipe at a normally inaccessible location, a plastically deformable metallic sleeve capable of being cold welded to the pipe is positioned at the required location, and a conductive wire is exploded electromagnetically within the sleeve to expand the sleeve into cold welding relation with the pipe.</p> |
