Test body according to Prof. Berthold for detecting the direction of magnetization, as well as the magnetization strength and defect detectability.
Description
The test body consists of a soft iron cylinder. This is divided into four equal sectors separated by a gap approx. 0.15 mm wide. Viewed from above, this results in a cross slot.
The top of the cylinder is covered with a thin, non-ferromagnetic metal foil over a screw cap. The distance between the cylinder and the metal foil can be precisely
cylinder and the metal foil can be precisely adjusted by turning the lid.
If the test body is placed on a magnetized test object, some of the magnetic lines of force flow through the soft iron cylinder.
If the magnetization is sufficient, one or the other gap of the cross slot is formed on the foil after rinsing with magnetic powder suspension.
The further the foil can be turned upwards without the magnetic particle display disappearing, the more sensitive the test system is - whether as a result of the magnetization field strength and/or the quality of the test medium used.
quality of the test equipment used.
To determine the direction of the magnetic field, the test object is slowly rotated around its vertical axis until the display of one of the columns shows a clear maximum.
The determined magnetic field direction then runs perpendicular to the displayed slit.
The test body is magnetised and irrigated together with the workpiece to be tested. The indication of the cross-shaped crack is assessed.
The test body is used to detect the:
- Magnetising direction
- Magnetising strength
- Fault detectability
Technical data
Article designation | Order number |
---|---|
Test body according to Prof. Berthold | 100-037 |