| 摘要 |
An improved drilling pipe for directional boring uses a frictionally welded threaded coupling attached to pipe ends for connecting multiple pipes in a drill string. A stress spreader of the end coupling crosses the frictionally welded region to modify stresses on the weld. A weld flash receiving groove positioned beneath the weld allows the insert to be in place during the inertial welding operation and to be closely coupled to the interior pipe surfaces to receive forces therefrom.
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