PROCESS OF QUALITY INSPECTION OF FERROMAGNETIC ARTICLES Russian patent published in 1995 - IPC

FIELD: nondestructive testing. SUBSTANCE: article is magnetized up to saturation, magnetizing field is switched off, article is demagnetized up to preset value of induction, then it magnetized again. In this case current values of induction B of article and intensity H_e of external magnetic field are measured, current value of auxiliary parameter A which is function of intensity H_e as well as demagnetization factors N of tested articles and N′ of standard articles are computed. Value of testing parameter B_t is fixed at moment of equality of induction B and parameter A. EFFECT: expanded assortment of tested articles, increased authenticity of testing. 7 dwg