Magnetic particle test

The magnetic particle test (also fluxes called) is a procedure to the proof of cracks in or near the surface of ferromagnetic materials. For the check the work piece must be magnetized. With the big work pieces with which a complete magnetization is not possible only the examining subrange is magnetized. The lines of flux originating from the magnetization run in parallel with surface. Cracks and defects close to surfaces which lie crosswise to the lines of flux generate a magnetic litter field. That is the lines of flux stamp out on one side of the defect from the ferromagnetischen material and on the other side again one.

 

This entails the origin of magnetic poles. If iron powder above this litter field is distributed now, it collects in the defect because it is drawn by the magnetic effect. The cracks which run in parallel with the lines of flux generate no litter field and cannot be proved therefore. Pores and cracks below the surface can be localized only up to a certain depth.

 

Area of application

This procedure is used to the recognition by surface mistakes of magnetizeable functional-critical and security-critical components from steel or cast iron. It is suited especially for work pieces with complicated and irregular geometry.

 

Norms

DIN EN 473	Education and qualification of staff
DIN EN ISO 9934	Magnetic particle test ; general basics
DIN EN ISO 9934-2	Magnetic particle test; test fluid
DIN EN ISO 9934-3	Magnetic particle test; Devices/Equipments
DIN EN ISO 30 59	MT and PT-test; Regarding conditions
DIN EN 1290	MT-test of welding
DIN 54 130	Magnetic litter flow methode