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- since 1996 -
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Technical Discussions
Amir
Amir
05:05 Apr-17-2019
CIVA

Has anyone experienced about simulation of slag inclusion by CIVA software ?
How can I put dimensions of the defect on the model?
and how can I interperate the signal?
and
at the end, how can I extract the signal amplitude for pod study?

Thanks,
Amir

    
 
 Reply 
 
Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1266

Edward Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1266
13:51 Apr-17-2019
Re: CIVA
In Reply to Amir at 05:05 Apr-17-2019 (Opening).

Amir, are you a user of Civa? Do you have a copy of the software in your place of work?
Your posts on this forum seem to imply you have the software (e.g. how to extract signal amplitude for POD), yet the answers you are asking for would normally be had with a basic course from Extende on the use of Civa.
As for the reliability of Civa, you can look at many technical reports and studies posted on the internet, many are collected in one location at http://www.extende.com/publications
In the QNDE Benchmark papers for UT, you will find that the Civa simulations are typically within 2dB of the experimental results. This is the same sort of small variation that can exist between any 2 instruments.
Civa offers several methods of flaw simulation including multifaceted, branched, and 2D surface breaking flaws. YOu could also import 3D CAD files.
Reproducing all the many possible facets of slag is not reasonably feasible. Besides, you would need full details of the shape if you wanted to get to that level of detail.
In addition to the papers found on the website I indicted above, you will also find a paper where I used an old version of Civa (Civa 10) and the features of "multi-faceted defect" to construct simulations of slag in a GMAW weld https://www.ndt.net/article/ndtnet/2011/1_Ginzel.pdf. There you will see that although the model provided reproductions within 2dB for most channels and 2 varied by 4dB. This is quite close considering the shape of the slag surface in the length dimension was not possible to ascertain from a single slice macro image.

If you are struggling with the process to generate POD analysis in Civa I recommend attending a course on the subject (you can contact Extende for details).

    
 
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