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ULTRASOUND INSTITUTE
The Ultrasound Institute can develop new advanced ultrasonic measurement, imaging and NDT techniques for non-conventional applications.
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Technical Discussions
kaushal Jha
Engineering,
BHEL, India, Joined Feb 2014, 18

kaushal Jha

Engineering,
BHEL,
India,
Joined Feb 2014
18
10:58 Jan-19-2015
WET MPI

Dear Sir,
We are having Shaft Of Max Dia 140mm. It is completely machined surface of (Rt 0.8 Micron)
we want to conduct Visible Wet MPI. It is possible through Yoke Method or not. Presently we dont have the set up of Stationary Head stock method.

Please clarify.

 
 Reply 
 
Nirav Dave
NDT Inspector,
Company, India, Joined Jul 2014, 11

Nirav Dave

NDT Inspector,
Company,
India,
Joined Jul 2014
11
11:40 Jan-19-2015
Re: WET MPI
In Reply to kaushal Jha at 10:58 Jan-19-2015 (Opening).

Kaushal

yes, it is possible through yoke method. what is the length of the shaft?

 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
14:14 Jan-19-2015
Re: WET MPI
In Reply to Nirav Dave at 11:40 Jan-19-2015 .

It may be possible. but that doesnt mean its desirable or acceptable to use a heavily contact-dependent technique on such a tight radius of curvature (140mm dia).

Such a good surface finish begs testing on a bench unit using current flow and coil shots. That way all the surface is tested in two perpendicular directions with the only contact being at the end-faces of the shaft. Demagnetisation will also be necessary - most bench units are automatically programmed for reducing reversing demagnetisation.

You should use fluorescent MPI for enhanced sensitivity and speed of operation.

My advice is if you are not in possession of a suitable bench unit then sub-contract the testing work to a reputable NDT company with sthe right equipment and experienced personnel.

1
 
 Reply 
 

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