Method and device for the nondestructive testing of pipes

Details Method and device for the nondestructive testing of pipes Method and device for the nondestructive testing of pipes

G - Physics

01

N

G01N 27/87 (2006.01) G01N 27/83 (2006.01)

Patent

CA 2573597

The invention relates to a method for testing pipes (1) in a non-destructive manner with the aid of a dispersion flow, said pipes being made of ferromagnetic steel. According to the invention, the pipe which is displaced in the longitudinal direction and, optionally, rotated is magnetised by a continuous field and the produced magnetic flow is transmitted in a contactless manner to the pipe. Projections (4, 4') which are located in the areas close to the surface of the external and internal surfaces of the pipes provoke magnetic dispersion flows which exit the surface of the pipe and can be detected by sensors (2, 2'). Ampltitudes, preferably the horizontal field components of the magnetic flow, which can alter in the vertical direction are detected at a distance close to the surface of the external surface of the pipe and at a distance therefrom. The detected signals are determined in relation to each other. The invention also relates to the device for carrying out said method.

L'invention concerne un procédé d'essai non destructif de tuyaux (1) en acier ferromagnétique à l'aide d'un flux de dispersion. Selon ce procédé, le tuyau qui se déplace dans la direction longitudinale et éventuellement tourne, est aimanté par un champ continu. Le flux magnétique produit est transmis sans contact au tuyau et les discontinuités (4, 4') situées à proximité de la surface externe et de la surface interne du tuyau provoquent des flux de dispersion magnétiques qui sortent de la surface du tuyau et peuvent être détectés par des détecteurs (2, 2'). Les amplitudes, de préférence, les composantes champ horizontales du flux de dispersion magnétique, variables dans la direction verticale sont détectées, d'une part, à une distance proche de la surface externe du tuyau et, d'autre part, à une autre distance plus éloignée. Les signaux détectés sont déterminés les uns par rapport aux autres. L'invention concerne également le dispositif permettant de mettre en oeuvre ce procédé.

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