Method and device for testing pipes in a non-destructive manner

Details Method and device for testing pipes in a non-destructive manner Method and device for testing pipes in a non-destructive manner

2005-06-10

2010-06-01

Aurora, Reena (Department: 2858)

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

C324S227000, C324S232000

Reexamination Certificate

active

07728586

ABSTRACT:
The present invention pertains to a method for the nondestructive testing of pipes made of ferromagnetic steel by means of a stray flux, in which the pipe, which is moving in the longitudinal direction and alternatively additionally rotating, is magnetized by a constant field, and the generated magnetic flux is transmitted into the pipe in a contactless manner, and the flaws that are located in the near-surface area of the outer or inner surface of the pipe bring about magnetic stray fluxes, which emerge from the pipe surface and are detected by means of sensors. The amplitudes, preferably of the horizontal field component of the magnetic stray flux, which vary in the vertical direction, are detected, on the one hand, at a near-surface distance from the pipe outer surface, and, on the other hand, at a distance lying further remotely therefrom, and the detected signals are related to one another.

REFERENCES:
patent: 6366085 (2002-04-01), Yeshurun et al.
patent: 2003/0117134 (2003-06-01), Almaguer
patent: 2925924 (1981-01-01), None
patent: 62185162 (1987-08-01), None
patent: WO02095383 (2002-11-01), None
International Search Report for corresponding International Appln, No. PCT/De2005/001074 completed Sep. 2, 2005. (Mailed: Oct. 6, 2005).

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