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Technical Discussions
fresh
fresh
07:38 May-28-2009
can we do ut shear wave on paint surface

as title say

    
 
 
Neil Burleigh
Sales
Krautkramer Australia Pty Ltd, Australia, Joined Dec 2002, 152

Neil Burleigh

Sales
Krautkramer Australia Pty Ltd,
Australia,
Joined Dec 2002
152
09:20 May-28-2009
Re: can we do ut shear wave on paint surface
In Reply to fresh at 07:38 May-28-2009 (Opening).

Yes it is possible to perform UT shear wave inspection on painted surface, but you must carry out a number of other inspections prior to the shear wave inspection.
1. compression wave inspection of paint steel interface to ensure uniformity of the bond.
2. paint thickness inspection of coating any large variations in coating thickness could cause mode conversion variations and or attenuation losses.
3. check for transfer losses/gains when comparing your cal block to your inspection surface. I myself have experienced a 10 -12 db transfer gain from steel test block to painted surface.
Hope this helps.
Regards
Neil Burleigh

    
 
 
fresh
fresh
06:24 May-29-2009
Re: can we do ut shear wave on paint surface
In Reply to Neil Burleigh at 09:20 May-28-2009 .

Thanks neil for your explaination..

    
 
 
ARUN SADASIVAN
ARUN SADASIVAN
19:52 Apr-07-2014
Re: Re: can we do ut shear wave on paint surface
In Reply to fresh at 06:24 May-29-2009 .

sir
if we do shear wave through paint coating will that affect the refracted angle. because there are two interfaces
1) perspex paint interface 2) paint steel interface

    
 
 
Jorge Santin
NDT Inspector, consultant
Pró END Consultoria Ltda, Brazil, Joined May 2011, 8

Jorge Santin

NDT Inspector, consultant
Pró END Consultoria Ltda,
Brazil,
Joined May 2011
8
22:02 Apr-07-2014
Re: Re: can we do ut shear wave on paint surface
In Reply to ARUN SADASIVAN at 19:52 Apr-07-2014 .

Dear Arun
The refracted angle depends only the first and the last medium. If you calculate all interfaces you will have the same result. The paint change material attenuation (check transfer loss) and it depends on paint film thickness.

    
 
 

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