This part of GB/T 15822 specifies the general principles for the magnetic particle testing of ferromagnetic materials. The magnetic particle testing is mainly used to test the discontinuity of surface openings (especially cracks) and also the near-surface discontinuity, but its sensitivity drops quickly with depth.
This part defines surface preparation of tested workpieces, magnetization technology and the requirements for and application of testing media, as well as the recording and interpretation of results arising therefrom. No provision has been made for the acceptance criteria. As for the magnetic particle testing on special items, additional requirements will be specified according to the product standard.
The residual magnetic method is non-applicable to this part.
