Abstract
A magnetic technique is proposed to detect discontinuities in metal products. It stems from the dependence of magnetic field strength on the surface of conducting objects on the density of the electric current flowing in them and the magnetic field strength gradients appearing on the areas with discontinuities due to a change in the current density. The paper studies magnetic field distribution on the surface of aluminum alloy specimens with model discontinuities as electric current flows in them. During testing, electric current is passed through the product and magnetic field strength on various surface areas is recorded by scanning the product surface with a magnetically sensitive transducer. The scan results, namely, the presence of field strength extrema, testify to the presence of discontinuities in products made of non-ferromagnetic metals. The technique has been tested on an aluminum-alloy specimen containing a weld with a discontinuity.
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