What kind of defect is detected when using longitudinal magnetization?

When using longitudinal magnetization for flaw detection, a transverse defect is the type that can be effectively identified. Longitudinal magnetization involves applying a magnetic field in the direction of the length of the part being inspected. This magnetic field aligns magnetic particles along that direction, which makes it easier to detect defects that are perpendicular to the magnetic lines of force.

Transverse defects are oriented across the direction of the applied magnetic field. When these defects are present, they disrupt the continuous magnetic field, allowing for the identification of cracks or flaws. Therefore, transverse defects are the primary focus when using longitudinal magnetization techniques, as they can lead to significant issues in structural integrity if undetected.

The other types of defects, such as lateral or radial defects, do not align as well with the orientation of the longitudinal magnetic field, making them less detectable with this method. Thus, transverse defects provide the correct context for what is detected using longitudinal magnetization.