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Waygate Technologies
Waygate Technologies, a Baker Hughes business (formerly GE Inspection Technologies), is an industrial inspection solutions company and the world ...
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Technical Discussions
Jun
Jun
22:36 Mar-04-2018
Cannot get UT echo from

We have been having trouble getting UT signal from a 3 in thick coating on a large metal cyclinder. We used to be able to get the echo signal back from the metal at the center. Lately, we lost the echo. Is it possible that the rubber is not mixed well and there is too much scattering? What other factor can lead to the loss of the signal?

 
 Reply 
 
Phil Harper
Director, Tribosonics
Tribosonics Ltd, United Kingdom, Joined Feb 2004, 10

Phil Harper

Director, Tribosonics
Tribosonics Ltd,
United Kingdom,
Joined Feb 2004
10
08:27 Mar-05-2018
Re: Cannot get UT echo from
In Reply to Jun at 22:36 Mar-04-2018 (Opening).

Hi,

There could be a whole number of reasons why this occurs. If the material is highly attenuative (3" of polymer probably is) then you could loose your signal. Are you measuring at the same temperature? Have you done an optical inspection of the good coating and the bad coating? Is your UT equipment calibrated and performing to specification? Has the supplier changed the materials without telling you? Has the geometry changed? Is your coupling different? Have you tried a Pitch/Catch arrangement? Have you tried dropping the frequency to get back to a point where you get a signal?

Hopefully some of these questions might help.

Best Regards,

Phil

Founder and CEO of Tribosonics Ltd

 
 Reply 
 
Jun
Jun
15:15 Mar-05-2018
Re: Cannot get UT echo from
In Reply to Phil Harper at 08:27 Mar-05-2018 .

Phil,

We are not making any changes. We actually made a reference block 3"X5" in the lab and was able to get signal. But the production coating cannot get signal even on 1" thick sample sampled from the product while freestanding right next to the reference 5" block. We are suspecting microvoids from insufficient pressing while making the coating, or moisture?

 
 Reply 
 
Phil Harper
Director, Tribosonics
Tribosonics Ltd, United Kingdom, Joined Feb 2004, 10

Phil Harper

Director, Tribosonics
Tribosonics Ltd,
United Kingdom,
Joined Feb 2004
10
16:50 Mar-05-2018
Re: Cannot get UT echo from
In Reply to Jun at 15:15 Mar-05-2018 .

Hi,

Interesting. There is clearly something going on. Without knowing the materials or the processing method I don't know what is happening but clearly there is an effect. It is not uncommon for 'samples' to be made separately from the manufacturing process and therefore to be anything but a 'sample'. Really you need a sample (better, samples) from the actual production line with actual materials and manufacturing processes.

Phil

 
 Reply 
 
Simon Amallraja
Simon Amallraja
06:10 Mar-06-2018
Re: Cannot get UT echo from
In Reply to Jun at 22:36 Mar-04-2018 (Opening).

What do you want to test? Bond between the materials?

For such high thickness you need to use high power and high energy tone burst Ultrasonic Pulser Receiver. contact us for more info on that.

 
 Reply 
 

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