Circular Standard PM N-1598 in Magnetic Particle Testing
In Magnetic Particle Testing (MPT) , the efficiency of the inspection depends on the correct application of the magnetic field to the part being tested.
The intensity and direction of this field are determining factors for the detection of surface or near-surface discontinuities.
To verify that the magnetization conditions are adequate, control devices are used, such as the PM N-1598 Circular Standard , employed to evaluate the intensity and direction of the magnetic field applied during the test.
This feature allows the inspector to confirm whether the applied magnetization is adequate for testing.
What is the PM N-1598 Circular Standard?
The PM N-1598 Circular Standard is a device used to verify the intensity and direction of the magnetic field applied to the part during magnetic particle testing.
Its use helps confirm that the applied magnetic field has suitable conditions to reveal discontinuities in different orientations.
Application in Magnetic Particle Testing
The circular pattern is used to ensure that the applied magnetic field is suitable for multi-directional testing , and can be employed with wet or dry magnetic particles .
During the verification process, the standard is positioned over the area to be tested, and the magnetic field is applied along with the magnetic particles.
When the magnetization is adequate, a circular indication forms on the surface of the pattern, allowing the orientation and intensity of the applied magnetic field to be evaluated.
Construction of the Circular Pattern
The circular pattern is manufactured from low-carbon steel , coated with non-ferrous material , a characteristic that enhances its performance during the verification of the applied magnetization.
This construction allows for the clear formation of indications produced by magnetic particles during the evaluation of the applied field.
Usage Procedure
Verification using the circular standard follows a simple procedure:
- Position the standard over the area of the part to be tested.
- Apply the magnetic field and simultaneously apply the magnetic particles.
- When using dry magnetic particles, remove the excess with a light blow.
- Observe the regions of the circle perpendicular to the direction of the applied field, which should show indications.
- When the field strength is adequate, the magnetic particles form visible indications on the surface of the pattern.
- After verification, demagnetize the standard.
This procedure allows us to confirm whether the magnetization conditions are suitable for performing the test.
Applicable Standards and Specifications
The PM N-1598 Circular Standard meets the following specifications: • ABNT NBR NM 342
This standard establishes requirements related to the execution of magnetic particle tests and the devices used to verify magnetization conditions.
Storage and Care Instructions
The circular pattern should be used and stored carefully to avoid damage that could compromise its performance.
It is recommended to:
• clean with a soft cloth before storage;
• avoid impacts or deformation;
When used and stored correctly, the device has an indefinite shelf life .
Importance of Magnetization Control
The correct application of the magnetic field is fundamental to the reliability of magnetic particle testing.
If the applied field is insufficient or improperly oriented in relation to the discontinuities, the sensitivity of the test may be reduced, making detection more difficult.
The use of verification devices, such as the PM N-1598 Circular Standard , helps to ensure that magnetization conditions are adequate during inspection.
The PM N-1598 Circular Standard is an important tool for verifying the intensity and direction of the magnetic field in magnetic particle testing.
Its use helps confirm the applied magnetization conditions, contributing to the reliability of inspections and the correct detection of discontinuities.
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