Patent ID: 11630081

Abstract:
The method for non-destructive flaw detection of aluminium reduction cell anodes is claimed, including the building of a computed model of an anode or the use of a specified model with the known data on the geometry and specific resistance of the anode, the geometry and coordinates of internal defects, wherein several cyclic calculations are carried out; the results of calculations are represented in the form of a 3D-matrix of amplitudes and directions of vectors of calculated intensities or inductions of the electromagnetic field at the discretization points near the outer surface of the anode; at least a pair of electrically conductive contacts that supply the specified amount of electrical current through the anode are placed on the outer surfaces of the inspected anode; at least one sensor is placed near the outer surface of the inspected anode, and the amplitude and direction of the magnetic field intensity or induction vectors are measured and represented as a 3D-matrix of measured magnetic field intensity or induction vectors; the 3D-matrices of calculated and measured magnetic field intensity or induction vectors at the same discretization points near the outer surface of the anode are compared; and, based on results, the sizes and coordinates of internal defects are observed. As a result, the informational value and accuracy of determining the location of defects are increased; the process capabilities of the method are expanded by reducing the instability of transition resistances of the contact area in the stub holes of the anode; the confidence and reliability of flaw detection by measuring the magnetic field intensity vectors with contactless sensors are improved.