MPI is for ferromagnetic materials only. It is supposedly useful for defects of depth 6mm, but ask anyone who performs the tests and they will tell you it is not!
DPI can be conducted on any material. It is not recommended on materials that have porous surfaces such as castings and the like.
Strictly speaking they are both considered surface tests. As regards substituting one for the other, I have never come across any situation where you couldn't. What are you testing?
Declan
On 29/06/2010 17:35, mohammed helal wrote:
The major difference is the DPI is only for the defects that open to the surface and the MPI for the subsurface defect ( 6 mm deep).
Eng.MOHAMMED ABD EL-AZIM HILALMECHANICAL ENGINEERCSWIP 3.1 - NDT (RT- MT - PT)OTISHAN CONSULTANT ENGINEER00966-502612218 - 0020103124557
--- On Tue, 6/29/10, george.dilintas@gr.bureauveritas.com <george.dilintas@gr.bureauveritas.com> wrote:
From: george.dilintas@gr.bureauveritas.com <george.dilintas@gr.bureauveritas.com>
Subject: Re: [MW:5791] MPI vs DPI
To: "materials-welding" <materials-welding@googlegroups.com>
Date: Tuesday, June 29, 2010, 7:06 PM
Mpi can be used only on ferromagnetic materials
----- Original Message -----
From: Amir Zakee Adnal [amirzakee@gmail.com]
Sent: 29/06/2010 16:52 ZE5
To: materials-welding@googlegroups.com
Subject: [MW:5787] MPI vs DPI
Dear all
What is/are major difference between MPI and DPI? Can MPI be
substitute with DPI? Is there any code or standard that allow such
substitution?
Regards,
Amir Zakee
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