| 摘要 |
<p>The welded joints of newly constructed pipelines are verified by X-ray, utilizing equipment mounted to a self-propelled trolley that travels along the bore; the trolley is controlled and positioned using a magnetic source (1) applied by hand to the outside of the pipeline, and a receiver (5), located inside the pipeline, which consists in two coils (6, 7) suitably spaced apart and fitted to the trolley in such a way as to be invested by the magnetic field generated externally of the pipe wall.</p> |
