Device for testing ferromagnetic component walls without...

G - Physics – 01 – N

Patent

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Details

G01N 29/04 (2006.01) B06B 1/04 (2006.01) G01N 29/22 (2006.01)

Patent

CA 2592094

The invention relates to a device for testing ferromagnetic component walls, such as pipe or plate walls, for cracks or other such elongated defects, without destroying the same, by means of ultrasound waves, especially shear waves, that are excited in a wall region magnetised in a pre-determined magnet direction by a high-frequency induction coil, are diffused on a strip that can be aligned with the induction coil embodied as an emitting transducer, and are received at a distance from the emitting transducer by means of at least one induction coil embodied as a receiving transducer. Said device is embodied in such a way that defects of a pre-defined shape, especially cracks caused by stress-crack corrosion, are easy to detect, without an unreasonable increase in the structural complexity and the energy requirements of the device.

L'invention concerne un dispositif d'essai non destructif de parois à composants ferromagnétiques, telles que des parois de tubes ou de plaques, pour la détection de fissures ou d'autres défauts étendus, au moyen d'ondes ultrasonores, en particulier, des ondes de cisaillement qui sont activées dans une zone de paroi magnétisée, dans une direction d'aimantation prédéterminée, par une bobine d'induction haute fréquence, et qui s'étendent sur une trajectoire en alignement avec la bobine d'induction en tant que transducteur d'émission, et qui sont reçues à distance du transducteur d'émission, par au moins une bobine d'induction configurée comme transducteur de réception. Conformément à l'invention, le dispositif est configuré de façon que des défauts de forme prédéterminée, en particulier des fissures provenant d'une corrosion par fissuration sous contrainte soient facilement détectés, sans qu'il soit nécessaire de recourir à des dépenses exagérées de construction et d'énergie du dispositif.

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