Esterer Gießerei - Magnetic particle testing

Magnetic particle testing, short MT-testing, is a procedure of non-destructive quality control of ferro-magnetic materials as iron. With it we wish to find cracks or imperfections on or near the surface of castings. We refer to it also as magnetic crack inspection.

For the procedure itself the casting, or a part of it at big parts, is magnetised and iron powder is applied over the inspected surface. Because of magnetic effects the powder accumulates at the imperfection and identifies the error.

Considering, if we want to inspect longitudinal or lateral cracks, we use different methods of magnetising:

• Current carrying
  the aim is to identify longitudinal cracks
• Field carrying
  the aim is to identify lateral cracks
• Combined crack detection,
  when we suspect cracks without primary directions.

In order to make imperfections visible at magnetic powder testing, we work with fluorescent testing agents