FIELD: physics.
SUBSTANCE: on the controlled surface of the rod of a steel bolt or stud, using the pole of a rod-type magnetising device, a local region is formed having metal remnant magnetisation, the normal component of the field of remnant magnetisation over the middle of that local region is measured and the measured magnetic field value is used to determine the value of mechanical stress in the rod of the steel bolt or stud.
EFFECT: high sensitivity of measuring the level of tightness and wider range of controlled bolts.
3 dwg
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