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Technical Discussions
gowri santhosh
NDT Inspector,
Royscan engineering pte ltd, Singapore, Joined May 2008, 51

gowri santhosh

NDT Inspector,
Royscan engineering pte ltd,
Singapore,
Joined May 2008
51
04:03 Oct-25-2008
UT for below 8mm thk

hi, this is santhosh
please tell me about UT for below 8mm thickness with reference code. thanks for reply.


    
 
 
Ed T.
Ed T.
07:46 Oct-25-2008
Re: UT for below 8mm thk
----------- Start Original Message -----------
: hi, this is santhosh
: please tell me about UT for below 8mm thickness with reference code. thanks for reply.
------------ End Original Message ------------

Please provide more details. MAnual or automated UT? What type of material.




    
 
 
NEELA
NEELA
07:23 Oct-26-2008
Re: UT for below 8mm thk
----------- Start Original Message -----------
: hi, this is santhosh
: please tell me about UT for below 8mm thickness with reference code. thanks for reply.
------------ End Original Message ------------

As per AWS D 1.1 you cannot peform UT below 8mm thickness It require client acceptance and special calibration block required



    
 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
03:55 Oct-27-2008
Re: UT for below 8mm thk
If AWS code compliance is required, that is an issue, however there is no inherent physics reason why you can't perform angle beam flaw detection, straight beam flaw detection, or ultrasonic thickness gaging on thinner metal. With proper transducers and appropriate setup on appropriate reference standards, you can obtain useful information.


----------- Start Original Message -----------
: As per AWS D 1.1 you cannot peform UT below 8mm thickness It require client acceptance and special calibration block required
------------ End Original Message ------------




    
 
 
David Harvey
Engineering
ATI - Wah Chang, USA, Joined Nov 2002, 42

David Harvey

Engineering
ATI - Wah Chang,
USA,
Joined Nov 2002
42
06:12 Oct-27-2008
Re: UT for below 8mm thk
----------- Start Original Message -----------
: If AWS code compliance is required, that is an issue, however there is no inherent physics reason why you can't perform angle beam flaw detection, straight beam flaw detection, or ultrasonic thickness gaging on thinner metal. With proper transducers and appropriate setup on appropriate reference standards, you can obtain useful information.
:
: : As per AWS D 1.1 you cannot peform UT below 8mm thickness It require client acceptance and special calibration block required
------------ End Original Message ------------

If near-surface resolution is a concern, material this thin can be a tough one. You can find yourself in a spot where you will need to resort to a through transmission type of test, which won't much care about surface resolution.


    
 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
06:54 Oct-27-2008
Re: UT for below 8mm thk
Good near surface resolution is a function of transducer selection as well as test material properties. For straight beam testing or thickness gaging in steel, a 20 MHz broadband transducer -- within the bandwidth of most portable flaw detectors -- will typically resolve reflectors within 0.5 mm of the contact surface, and a 10 MHz broadband transducer will typically get within 1 mm or better. But if you don't have a high frequency transducer available, I agree that there will be limitations. It's just a question of using an optimum transducer and instrument setup.

----------- Start Original Message -----------
:: If near-surface resolution is a concern, material this thin can be a tough one. You can find yourself in a spot where you will need to resort to a through transmission type of test, which won't much care about surface resolution.
------------ End Original Message ------------




    
 
 
JK
JK
08:09 Oct-29-2008
Re: UT for below 8mm thk
Hi,

Though there are some codes which allow UT to be carried out above 6 mm.

Using a 4Mhz transducer(8x9 mm) preferebly 70,80 degree krautkrammer probes & increasing the skip to 1-2 skip .

The best way to do is take a mock-up peice of the thickness of the weld you are going to test . A notch on the root and on the crown of the weld would be used as reference.

Anything more on this please contact me

Regards
J.K




    
 
 
NEELA
NEELA
06:13 Oct-30-2008
Re: UT for below 8mm thk
Dear J.K.
Please mention the code ,It will help forum member to discuss further
Thanks
----------- Start Original Message -----------
: Hi,
: Though there are some codes which allow UT to be carried out above 6 mm.
: Using a 4Mhz transducer(8x9 mm) preferebly 70,80 degree krautkrammer probes & increasing the skip to 1-2 skip .
: The best way to do is take a mock-up peice of the thickness of the weld you are going to test . A notch on the root and on the crown of the weld would be used as reference.
: Anything more on this please contact me
: Regards
: J.K
------------ End Original Message ------------




    
 
 
chris s
Consultant, qc manager
USA, Joined Apr 2007, 9

chris s

Consultant, qc manager
USA,
Joined Apr 2007
9
08:08 Nov-04-2008
Re: UT for below 8mm thk
----------- Start Original Message -----------
: hi, this is santhosh
: please tell me about UT for below 8mm thickness with reference code. thanks for reply.
------------ End Original Message ------------

I would suggest that you contact a level III who is knowledgeable in regards to phased array, make appropriate mock-ups and test your techs accordingly


    
 
 

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