What kind of defect is detected when using circular magnetization?

When using circular magnetization, the type of defect that is primarily detected is transverse. This method is particularly effective for identifying surface and near-surface defects that are oriented perpendicular to the magnetic field.

Circular magnetization induces magnetic fields in a circular pattern around the part being tested, allowing for the detection of defects that may not be aligned with the longitudinal direction of the test object. Transverse defects, such as cracks or inclusions that cross these circular lines of magnetic flux, will produce a leakage field that can be easily detected with appropriate magnetic particle inspection techniques. This is crucial in ensuring the structural integrity of components, as these types of defects can significantly compromise performance and safety in aircraft and other critical applications.

Longitudinal magnetization, on the other hand, is used to detect defects that run parallel to the direction of magnetization. Therefore, circular magnetization is specifically tailored for identifying transverse type defects, enhancing the effectiveness of inspections in identifying vulnerabilities in materials.