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- since 1996 -

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Technical Discussions
Azhar
Azhar
02:48 Feb-04-2007
Ask

How to carried out Ultrasonic Inspection on two layers material


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

Nigel

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
05:56 Feb-04-2007
Re: Ask
Azhar

Your question is too vague to allow a reasonable response. Which materials, relative thicknesses, bonding or joining method, what type and size of indications are you looking for? More details and you will probably get a response.


----------- Start Original Message -----------
: How to carried out Ultrasonic Inspection on two layers material
------------ End Original Message ------------




 
 Reply 
 
AZHAR
AZHAR
02:30 Feb-07-2007
Re: Ask
thanks for you respons nigel,


actually i just need to know,how we can carried out UT on two material with different properties.can you give the idea?,i means that what technique we have to used


 
 Reply 
 
Ed D.
Ed D.
06:06 Feb-07-2007
Re: Ask
----------- Start Original Message -----------
: thanks for you respons nigel,
:
: actually i just need to know,how we can carried out UT on two material with different properties.can you give the idea?,i means that what technique we have to used
------------ End Original Message ------------

WHat kind of differences are you taking about? Yu are being very vague.
If you mean velocity differences then you need to use a different calibraiton block for each material.



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

Nigel

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
08:17 Feb-07-2007
Re: Ask
If its a bonded joint then I suggest you have a test block made of the two materials with an intentional disbond area equivalent in size to the smallest area you wish to detect. Then, using a suitable compression wave probe, you can compare the response from the actual disbond with the reflection occasioned by the different acoustic impedances of the two materials according to the formula given on this page:

http://www.ndt.net/article/az/ut/reflc.htm

Very general I know but you are not giving any details of the test item. Use the excellent UT encyclopaedia on here.





 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1307

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1307
02:37 Feb-07-2007
Re: Ask
Azhar:
You have still not provided any details of your problem.
Might I suggest that as a starter you could simply use Nigel's list of items as a checklist and provide the details he itemised:
e.g.
Which materials: carbon steel to stainless

relative thicknesses: 3mm stainless to 25mm carbon steel

bonding or joining method: explosive welding

and so on....

Without information on the details no response is possible....There are some situations where ultrasonic testing may not be appropriate or perhaps even there are no NDT options available!
Ed

----------- Start Original Message -----------
: Azhar
: Your question is too vague to allow a reasonable response. Which materials, relative thicknesses, bonding or joining method, what type and size of indications are you looking for? More details and you will probably get a response.
:
: : How to carried out Ultrasonic Inspection on two layers material
------------ End Original Message ------------




 
 Reply 
 
Ed D.
Ed D.
05:49 Feb-08-2007
Re: Ask
----------- Start Original Message -----------
: Azhar:
: You have still not provided any details of your problem.
: Might I suggest that as a starter you could simply use Nigel's list of items as a checklist and provide the details he itemised:
: e.g.
: Which materials: carbon steel to stainless
: relative thicknesses: 3mm stainless to 25mm carbon steel
: bonding or joining method: explosive welding
: and so on....
: Without information on the details no response is possible....There are some situations where ultrasonic testing may not be appropriate or perhaps even there are no NDT options available!
: Ed
:
: : Azhar
: : Your question is too vague to allow a reasonable response. Which materials, relative thicknesses, bonding or joining method, what type and size of indications are you looking for? More details and you will probably get a response.
: :
: : : How to carried out Ultrasonic Inspection on two layers material
------------ End Original Message ------------

I agree with Ed G. The bottom line however, is you will probabl;y need a calibraiton block for each material or as Ed stated a mock up


 
 Reply 
 

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