As an effective non-destructive detection method

the magnetic particle detection is widely used for ferromagnetic parts and components in power plants to detect defects on their surface or near the surface

but in magnetic particle detection of angle weld joints on small size tube sockets

the probability of discovered defects is affected by many factors

such as the methods of magnetization

the choise of magnetizing direction

the selection of magnetizing equipment

and the control of magnetizing criterion etc..For this

two kinds of magnetizing mode;i.e.standing mode and striding across mode

and two kinds of magnetizing method

i.e.DC magnetization and AC magnetization

have been tested and compared.It is shown that the striding across mode may result in loss detection of the defects

and the AC Yoke has more better effects to magnetization of the workpieces.A method for enhancing the probability of dicovered defects in magnetic particle detection of angle weld joints on small size tube sockets based on Yoke magnetization has been put forward.