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- since 1996 -
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Technical Discussions
linto
linto
19:07 Jul-13-2019
UT for Cladding

Dear friends,
We have Cladding ( INC 625 ) Inside 2" bore pipes.But in coventional UT our 5 mm TR Probe cannot be seated well ie: Not getting Proper contact with Specimen.Any method or Probes which can Resolve this issue ?Can we stick Acrylic sheet on the probe and machine it in curved shape ,will it solve the issue ?

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 756

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
756
19:22 Jul-13-2019
Re: UT for Cladding
In Reply to linto at 19:07 Jul-13-2019 (Opening).

There are some TR probes with plexiglass that can be ground to the OD profile

1
 
 Reply 
 
Linto
Linto
19:57 Jul-13-2019
Re: UT for Cladding
In Reply to Anmol Birring at 19:22 Jul-13-2019 .

Dear friend from where can i Purchase this ? Can you share some details ?

 
 Reply 
 
laurie
Australia, Joined Feb 2019, 28

laurie

Australia,
Joined Feb 2019
28
02:50 Jul-15-2019
Re: UT for Cladding
In Reply to linto at 19:07 Jul-13-2019 (Opening).

It all depends on how many measurements you have to take and whether you're scanning and wearing the tip down or taking point measurements.

A TR probe for this application is not necessary if the cladding is on the surface that you're testing, except if it's very thin, or this is the only suitable probe you have.

Acrylic sheet could work out but you'll get a reflection from the tip to the acrylic and a reflection from the acrylic to the metal surface and then you'll get echo's from these as well, so depending on the focus distance of your probe these unwanted signals might be small or might be large. If you make the Perspex at least a third as thick as the cladding thickness then the echo's will be outside of your area of interest.
Not knowing the probe type or focus distance or thickness of cladding I can't be any more specific.
Just give it a try, if it doesn't work then take of the Perspex and no harm done.

If you have thousands of measurements to take then a small single crystal probe with a Perspex tip would do the job. Put some fine sandpaper on the inside of the pipe and rub the tip back and forth to profile to the surface curvature.

If it was me I'd mix up some thick couplant and use echo to echo with your existing probe and as long as the surface is reasonably smooth you should get a result pretty easily.

1
 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 856

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
856
00:47 Jul-16-2019
Re: UT for Cladding
In Reply to linto at 19:07 Jul-13-2019 (Opening).

I had a chance to work in that condition and a shoe was made to allow a better contact with the tube.

All you have to do is to buy a length of plexiglass in a solid rod shape. Then you machine a flat bottom hole the size of the transducer in the rod. Machine the hole deep enough to install a spring on top of the probe to provide good contact. Fabricate a cover to be place on top of the spring. once this is all done, you just have to put some couplant at the bottom of the hole followed by your probe and the cap. Shape the contact surface of the shoe to match the tube under inspection. Last, ensure that the length of the shoe is long enough so has not to have a back wall from the shoe showing on your screen.

1
 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 756

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
756
02:01 Jul-16-2019
Re: UT for Cladding
In Reply to Anmol Birring at 19:22 Jul-13-2019 .

check with technosonic

1
 
 Reply 
 

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