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Circular magnetization

 Circular magnetization

  • Circular magnetization is the induction of a magnetic field consisting of concentric circles of force about and within the part. This is achieved by passing an electric current through the part, locating defects running approximately parallel to the axis of the part.
  • In longitudinal magnetization, the magnetic field is produced in a direction parallel to the long axis of the part. This is accomplished by placing the part in a solenoid excited by electric current. The metal part then becomes the core of
  • In longitudinal magnetization of long parts, the solenoid must be moved along the part in order to magnetize it. This is necessary to ensure adequate field strength throughout the entire length of the part.
  • Solenoids produce effective magnetization for approximately 12 inches from each end of the coil, thus accommodating parts or sections approximately 30 inches in length. Longitudinal magnetization equivalent to that obtained by a solenoid may be accomplished by wrapping a flexible electrical conductor around the part.
  •  Although this method is not as convenient, it has an advantage in that the coils conform more closely to the shape of the part, producing a somewhat more uniform magnetization. The flexible coil method is also useful for large or irregularly-shaped parts when standard solenoids are not available. an electromagnet and is magnetized by induction from the magnetic field created in the solenoid.

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