Abstract
AN article in the Electrical Review of August 28 describes a magnetic detector used to facilitate crack detection in motor and aero-engine parts. While radiographic methods of crack and blow-hole detection possess undoubted advantages when the flaw lies below the surface, for superficial cracks and defects as much as 1\2 in. below the surface, the magnetic crack detector offers advantages in the speed and economy of its application. The general principles of the method have been described in the Electrical Review of April 4, 1940. They consist briefly of subjecting the part under test to a magnetic field and applying a magnetic powder, or a liquid medium containing such powder, to the suspected surface, so that any polarity due to a crack is rendered visible to the eye by collection of the magnetic particles over it.
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Magnetic Crack Detectors. Nature 150, 344 (1942). https://doi.org/10.1038/150344a0
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DOI: https://doi.org/10.1038/150344a0