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Technical Discussions
Andrei
NDT Inspector,
Philippines, Joined May 2015, 5

Andrei

NDT Inspector,
Philippines,
Joined May 2015
5
03:33 May-12-2015
UT Equipment for Lamination

Dear all,
Hello guys, just want to ask if there's any UT equipment that can be used for LAMINATION even the surface of the material had been coated or painted. Thanks in advance. God Bless
-Andrei

 
 Reply 
 
John
John
07:21 May-12-2015
Re: UT Equipment for Lamination
In Reply to Andrei at 03:33 May-12-2015 (Opening).

Most will do

 
 Reply 
 
Fedor Durnov
R & D, Head of R&D dpt.
ENGISS Ingenieurbüro GbR, Germany, Joined Jun 2010, 28

Fedor Durnov

R & D, Head of R&D dpt.
ENGISS Ingenieurbüro GbR,
Germany,
Joined Jun 2010
28
16:21 May-13-2015
Re: UT Equipment for Lamination
In Reply to Andrei at 03:33 May-12-2015 (Opening).

Hi Andrei,

If you have coating or paints on a surface, normal PE probes will not go, because you will never be able make an acoustic contact between test object and sensor. But you can use probes based on EMA technology http://www.nordinkraft.de/technology/emat/
We can do such equipment easily.

 
 Reply 
 
john
john
17:25 May-13-2015
Re: UT Equipment for Lamination
In Reply to Fedor Durnov at 16:21 May-13-2015 .

if this is only a lamination inspection, the presence of coating (barring zinc based hi temp paint or galvanizing) will work with virtually ANY probe. Try putting your probe on the part and see if you get a back-wall reflection!

 
 Reply 
 
Tom Nelligan
Tom Nelligan
17:55 May-13-2015
Re: UT Equipment for Lamination
In Reply to Fedor Durnov at 16:21 May-13-2015 .

"If you have coating or paints on a surface, normal PE probes will not go, because you will never be able make an acoustic contact between test object and sensor. "

Not true. Normal paint and epoxy coatings pose absolutely no problem to pulse/echo penetration at typical test frequencies as long as they are well bonded to the metal and not flaking or peeling. There is no need for the transducer to be in direct contact with the underlying metal. The coating adds slightly to the pulse transit time, but attenuation is usually insignificant. Thicker fiberglass and composite coatings can be challenging due to scattering, but normally not paint and certainly not thin metallic coatings such as galvenizing.

This application note is written around thickness gaging through paint, but the same principles apply when testing for laminar flaws with a straight beam transducer.

http://www.olympus-ims.com/en/applications/measuring-metal-thickness-paint/

 
 Reply 
 
Fedor Durnov
R & D, Head of R&D dpt.
ENGISS Ingenieurbüro GbR, Germany, Joined Jun 2010, 28

Fedor Durnov

R & D, Head of R&D dpt.
ENGISS Ingenieurbüro GbR,
Germany,
Joined Jun 2010
28
18:23 May-13-2015
Re: UT Equipment for Lamination
In Reply to Tom Nelligan at 17:55 May-13-2015 .

Ok, I am agree, not every coating will bring a problem for UT inspection, but still there are a lot of them will not give a possibility to make normal acoustic contact.
For example if you need to make conventional UT measurement of tube with polymeric coating, you will never do it without coating removing.
Normally it depend on structure of coating and coating thickness. I just told about common case.

 
 Reply 
 

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