The Magnetic Particle method can be used only on ferromagnetic materials to reveal surface discontinuities and to a limited degree, those located below the surface. The sensitivity of this method decreases rapidly with depths below the surface being examined and therefore, it is used primarily to examine for surface discontinuities. Ned Marine offers large, stationary in-house test units for high volume inspection and a full range of portable units designed for reliable, efficient testing in the field.
Scientific Principles
A magnetic field is applied to a component made from ferromagnetic material. The magnetic lines of force travel through the material, and exit and re-enter the material at the poles. Defects such as crack or voids cannot support as much flux, and force some of the flux outside of the part. Magnetic particles distributed over the component will be attracted by the areas of flow leakage and will give a visible indication.
Main Uses
Used to inspect ferromagnetic materials (those that can be magnetized) for defects that result in a transition in the magnetic permeability of a material. Magnetic particle inspection can detect surface and near-surface defects.
Main Advantages
Since 2010, Ned Marine Services BV has delivered maritime, offshore, and industrial solutions. Anchored in expertise, certified, fit for purpose. Let us know what you need.