This part of GB/T 15822 specifies general principles for the magnetic particle testing of ferromagnetic materials. Magnetic particle testing is primarily applicable to the detection of surface-breaking discontinuities, particularly cracks. It can also detect discontinuities just below the surface but its sensitivity diminishes rapidly with depth.
This part specifies the surface preparation of the part to be tested, magnetization techniques, requirements and application of the detection media and the recording and interpretation of results. Acceptance criteria are not defined. Additional requirements for the magnetic particle testing of particular items are defined in product standards.
This standard does not apply to the residual magnetization method.
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Qualification and certification of personnel
5 Safety and environmental requirements
6 Testing procedure
7 Surface preparation
8 Magnetization
9 Detection media
10 Viewing conditions
11 Overall performance test
12 Interpretation and recording of indications.
13 Demagnetization
14 Cleaning
15 Test report
Annex A
(informative)
Example for determination of currents required to achieve specified
tangential field strengths for various magnetization techniques
