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Technical Discussions
MATHEW JOSEPH
MATHEW JOSEPH
13:51 Nov-05-2019
DIFFERENCE IN MHZ for UT PROBES

hii All,

can You please help me on below Doubts ?

(1) If I use 2 MHz , 4 MHz, 5 MHz probe in conventional UT, for same thickness which probe will give right result ?

(2) what Difference the MHz can do in our inspection ?

(3) Which MHz is suitable up to which thickness ?

 
 Reply 
 
Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1300

Edward Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1300
15:30 Nov-05-2019
Re: DIFFERENCE IN MHZ for UT PROBES
In Reply to MATHEW JOSEPH at 13:51 Nov-05-2019 (Opening).

No single answer can be provided. The old EN 583-1 summarised the situation nicely;
"...the selection of frequency shall take into account the sound attenuation in the material and the reflectivity of imperfections. The higher this frequency; the greater the examination resolution, but the sound waves are more attenuated (or spurious signals due to the structure are greater). The choice of frequency thus represents a compromise between these two factors."

Another limiting factor can be the standard to which you are working to. Some standards are very prescriptive and define very limited frequencies that may be used.

 
 Reply 
 
John A. Brunk
Engineering, NDT Level III
Self employed, part-time, USA, Joined Oct 1999, 162

John A. Brunk

Engineering, NDT Level III
Self employed, part-time,
USA,
Joined Oct 1999
162
23:57 Nov-05-2019
Re: DIFFERENCE IN MHZ for UT PROBES
In Reply to MATHEW JOSEPH at 13:51 Nov-05-2019 (Opening).

I mean no disrespect, but your question indicates you have not received enough training to perform any sort of ultrasonic examination on your own. This is your employer’s responsibility and not your fault.

 
 Reply 
 

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