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Technical Discussions
NDT Inspector,
cooec, China, Joined Oct 2010, 15


NDT Inspector,
Joined Oct 2010
03:24 Nov-27-2019
when should we count the 3s when we use AC yoke testing.

there are two kinds of opinions
1.the power is on and spraying the particle, the whole magnetizing time us 3s.
2.after spraying the magnetic particle hold the power for 3s.
what's your opinion? the ASTM E709 don't identify it.

Miguel Diaz
Miguel Diaz
17:27 Nov-27-2019
Re: when should we count the 3s when we use AC yoke testing.
In Reply to Jim at 03:24 Nov-27-2019 (Opening).

Hola Jim,

Disculpa por escribirte en español pero entiendo bien tu pregunta y la puedo responder mejor en mi idioma.
La condición de usar una técnica de magnetización permanente durante la aplicación de las partículas o de magnetización residual es una condición afectada por la permeabilidad magnetica del material.... esto no se puede preveer teóricamente y es por esta razón que debes usar en la práctica tun indicador de fuga magnética tipo pastel o Burma Castrol u otro tipo según la aplicación que esté realizando.

Si el indicador genera o no las indicaciones, es la demostración de que la pieza tiene la suficiente permeabilidad para generar la fuga y atraer las partículas a las discontinuidades.


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