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Technical Discussions
Raphaël MICHEL
R & D,
Vallourec, France, Joined Feb 2016, 8

Raphaël MICHEL

R & D,
Vallourec,
France,
Joined Feb 2016
8
15:15 Feb-02-2016
Wet MPI: Continuous or true continuous magnetization

Dear all,

In the ASTM E709, it is well defined the difference between continuous and true continuous magnetization for Wet MPI.

• Continuous magnetization: (ASTM E709: §10.1.1):
o The magnetic particle are applied during the application of magnetizing current and stopped shortly before the current is stopped.
o The examination could be done after the magnetization in a dedicated inspection spot (we even may have two inspections spots for one magnetization spot)

• True continuous magnetization technique: (ASTM E709: §10.1.2):
o The magnetizing current is sustained throughout both the processing and examination of the part.

However, in the ASTM E1444, it is required (§6.2.6):
The particle application must be timed so that the magnetization levels reach full value in all directions while the particles are mobile on the surface under examination.

Does that imply that we must use the true continuous method only and that the continuous method is prohibited?

Thank you for your response.

Best regards.

Raphaël

 
 Reply 
 
Diego
Consultant,
Freelance, Spain, Joined May 2013, 188

Diego

Consultant,
Freelance,
Spain,
Joined May 2013
188
20:23 Feb-02-2016
Re: Wet MPI: Continuous or true continuous magnetization
In Reply to Raphaël MICHEL at 15:15 Feb-02-2016 (Opening).

Raphäel.
I think you have a misconception.
Continuous magnetization technique and true continuous technique are concepts applicables to the sequence of operations, whereas what is stated in E1444 6.2.6 is referred to multidirectional magnetization technique. That is: the true continuous, continuous and residual techniques may be used with prod technique, longitudinal magnetization technique, circular magnetization technique or yoke technique. You should bear in mind that the continuous method must be used when performing multidirectional magnetization.
Generally the continuos method is the most employed. In any case the technique shall be shown in the procedure to be used.

 
 Reply 
 
Raphaël MICHEL
R & D,
Vallourec, France, Joined Feb 2016, 8

Raphaël MICHEL

R & D,
Vallourec,
France,
Joined Feb 2016
8
09:23 Feb-04-2016
Re: Wet MPI: Continuous or true continuous magnetization
In Reply to Diego at 20:23 Feb-02-2016 .

Thank you Diego for your answer.

We have a customer requiring that the examination is performed at the exact same time than the magnetization shots. The reason is to lower the risk to "wash away" the indications.
Is it based on any standard or is it a customer wish?

Best regards.

Raphaël

 
 Reply 
 
jon wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

jon wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
09:54 Feb-04-2016
Re: Wet MPI: Continuous or true continuous magnetization
In Reply to Raphaël MICHEL at 09:23 Feb-04-2016 .

Whether this is a requirement of a norm or not, it is good working practice to start the observation and evaluation of the part being examined during magnetisation. This should be written in the procedure.
If you work with magnetic AC yokes you will often see that the indication doesn't hold after discontinuation of the field.

 
 Reply 
 
Diego
Consultant,
Freelance, Spain, Joined May 2013, 188

Diego

Consultant,
Freelance,
Spain,
Joined May 2013
188
14:20 Feb-04-2016
Re: Wet MPI: Continuous or true continuous magnetization
In Reply to Raphaël MICHEL at 09:23 Feb-04-2016 .

Raphäel.
Normally the continuous magnetization is the technique more used. According to ASME V Art 7, it is mandatory.
I do not know the specifications of your customer which you should fulfil.

 
 Reply 
 

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