GB/T 34357-2017Non-destructive testing—Terminology—Terms used in magnetic flux leakage testing (English PDF)

2.1 Magnetic Flux Leakage (MFL) testing

A non-destructive method for detecting and evaluating the in-vitro leakage of metal to the magnetic field outside the metal body.

2.2 DC magnetic flux leakage detection DCmagneticfluxleakagetesting

Through the detection and evaluation of the leakage of DC magnetic field metal metal body outside the magnetic field leakage detection method, the leakage magnetic field is static magnetic field, does not follow

Change of time.

2.3 AC magnetic flux leakage testing

By detecting and evaluating the magnetic flux leakage detection method of the leakage of the AC magnetic field in the metal body to the metal body external magnetic field, the leakage magnetic field with time and space

Variety.

2.4 Pulsed Magnetic Flux Leakage Testing

Through the detection and evaluation of metal body impulse magnetic field leakage to the magnetic field of metal magnetic flux leakage detection method.

2.5 Residual magnetism detection

Through the detection and evaluation of metal body residual magnetic field leakage to the metal magnetic field leakage magnetic detection method.

2.6 Main flux detection mainmagneticfluxtesting

Nondestructive testing methods for the detection and evaluation of magnetic flux in metals in vitro.

3.1 Technical magnetization

The change of the magnetic domain structure caused by the external magnetic field shows macroscopically that the magnetization (or magnetic flux density) of the ferromagnetic material changes with the application of external magnetic

Field changes, known as the magnetization of technology.

Note. The process of magnetization can be divided into three phases. the initial magnetization phase, the sharp magnetization phase, the slow magnetization and the transition to the magnetic saturation phase. Magnetic domain change package

Including magnetic domain wall movement and the magnetic domain within the magnetic moment rotation.

3.2 Local magnetization of

In the local area of the object to form a predetermined direction and size of the magnetization field magnetization technology.