Standard Practice for Magnetic Particle Examination of Steel Forgings Using Alternating Current

Importancia y uso:

5.1 For ferromagnetic materials, magnetic particle examination is widely specified for the detection of surface and near-surface flaws such as cracks, laps, seams, and linearly oriented nonmetallic inclusions. Such examinations are included as mandatory requirements in some forging standards such as Specifications A508/A508M and A963/A963M.

5.2 Use of alternating current as the power source for magnetic particle examination imposes a significant restriction on the detection of subsurface indications, so that the procedure is essentially limited to the finding of flaws that are open to the surface. Attention therefore is drawn to the need to have the component in the finish-machined condition before conducting the magnetic particle examination.

5.3 The presence of residual magnetic fields in a component may be undesirable, and an advantage of the use of an ac power source for magnetic particle examination is that an acceptable level of demagnetization can be readily achieved.

Subcomité:

A01.06

Referida por:

A0456_A0456M-24, A0983_A0983M-06R21, A0986_A0986M-01R21, A0788_A0788M-25, A0508_A0508M-23A

Volúmen:

01.05

Número ICS:

77.040.20 (Non-destructive testing of metals)

Palabras clave:

ac magnetization; circular magnetization; dry method; ferritic steel forgings; fluorescent method; longitudinal magnetization; surface flaw detection; wet method;