THE TOPOGRAPHY OF THE MAGNETIC-FIELD OF A DEFECT INCLINED TO THE SURFACE OF THE PRODUCT

We studied experimentally the influence of the magnetizing field stren gth on the topography of the component of the field of a defect that i s tangential to the surface of the product. Investigations with models of defects and with defective specimens of hot-rolled pipes showed th at in weak magnetizing fields the field of an inclined defect is analo gous in topography to the field of a defect situated normally to the s urface of the product, in strong fields there is some asymmetry of the field manifesting itself in the appearance of a negative extremum nea r the acute angle of the defect. The article suggests a mechanism of f ormation of the field of an inclined defect taking into account the in fluence of the nonlinear dependence of the magnetic properties of the material of the product on the magnetizing field.