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- since 1996 -

IMG ULTRASUONI SRL
Ultrasonic transducers for industrial applications (NDT) and medical (Doppler effect). Probes, Ultrasonic instruments, Special systems for NDT.
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Technical Discussions
Albera
NDT Inspector,
HI-TECH ISPECTION SERVICES L.L.C, OMAN, India, Joined Nov 2011, 3

Albera

NDT Inspector,
HI-TECH ISPECTION SERVICES L.L.C, OMAN,
India,
Joined Nov 2011
3
05:47 Feb-19-2015
How to measure the CLADDING thickness

Dear Gents,
Please clarify, how to measure the cladding thickness and which equipment is prefer to use for the measurement of the cladding thickness. Because we have to inspect the separator which is INCOLOY 825 CLAD. I would like to know the present cladding thickness.
Please advise me.

 
 Reply 
 
bounatirohatem
NDT Inspector, QAQC
Csc- exp, Algeria, Joined Sep 2011, 58

bounatirohatem

NDT Inspector, QAQC
Csc- exp,
Algeria,
Joined Sep 2011
58
17:04 Feb-19-2015
Re: How to measure the CLADDING thickness
In Reply to Albera at 05:47 Feb-19-2015 (Opening).

Dear

I think the best way to measure cladding thickness is to use UTM echo to echo technique, with the reference block from the same material to be inspected

Good luck

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

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
17:40 Feb-19-2015
Re: How to measure the CLADDING thickness
In Reply to Albera at 05:47 Feb-19-2015 (Opening).

Ultrasonic measurement of typical metallic claddings like Incoloy over steel is very difficult at best, because there is usually a close acoustic impedance match between the cladding and the substrate. Thus, if the cladding is well bonded, the echo from the boundary is very, very small.

If you have a reference standard of known thickness, check it with a flaw detector and a high frequency broadband contact or delay line transducer (10 MHz or 20 MHz). If you are lucky you may see a very small echo from the bondline. More often, the echo will be too small to see against background noise.

Echo-to-echo measurement techniques can be highly effective for measuring metal thickness beneath nonmetallic coatings like paint or epoxy, but that trick does not work when the coating and substrate are both metals.

 
 Reply 
 
Ali
NDT Inspector,
Iran, Joined Mar 2013, 105

Ali

NDT Inspector,
Iran,
Joined Mar 2013
105
21:03 Feb-19-2015
Re: How to measure the CLADDING thickness
In Reply to Tom Nelligan at 17:40 Feb-19-2015 .

Albera,

You Can also try ToFD.

Ali

 
 Reply 
 
Brian Belanger
NDT Inspector,
Canada, Joined Dec 2012, 6

Brian Belanger

NDT Inspector,
Canada,
Joined Dec 2012
6
21:48 Feb-19-2015
Re: How to measure the CLADDING thickness
We typically use a MLO instrument
 
 Reply 
 
Albera
NDT Inspector,
HI-TECH ISPECTION SERVICES L.L.C, OMAN, India, Joined Nov 2011, 3

Albera

NDT Inspector,
HI-TECH ISPECTION SERVICES L.L.C, OMAN,
India,
Joined Nov 2011
3
08:45 Feb-22-2015
Re: How to measure the CLADDING thickness
In Reply to Brian Belanger at 21:48 Feb-19-2015 .

Thanks to all for your effective suggestion.

Is it 45MG Ultrasonic Thickness Gage (THRU-COAT) suits for finding the cladding thickness? As per GA drawing cladding thickness not exceeds more than 3mm approximately.

 
 Reply 
 
Brian Belanger
NDT Inspector,
Canada, Joined Dec 2012, 6

Brian Belanger

NDT Inspector,
Canada,
Joined Dec 2012
6
19:28 Feb-22-2015
Re: How to measure the CLADDING thickness
In Reply to Albera at 08:45 Feb-22-2015 .

google elcometer inspection equipment

 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 218

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
218
00:21 Feb-23-2015
Re: How to measure the CLADDING thickness
In Reply to Albera at 05:47 Feb-19-2015 (Opening).

Isn't surface eddy current the way to go?

 
 Reply 
 
John
Consultant,
Sonomatic Ltd, United Kingdom, Joined Apr 2003, 14

John

Consultant,
Sonomatic Ltd,
United Kingdom,
Joined Apr 2003
14
11:31 Feb-23-2015
Re: How to measure the CLADDING thickness
In Reply to Albera at 05:47 Feb-19-2015 (Opening).

Are you testing from the clad side or from the opposite side.
From the outside TOFD is usually the best technique.

 
 Reply 
 
Manfred Richter
Consultant,
Richter & Tomasi Ltd., Brazil, Joined Jan 2008, 31

Manfred Richter

Consultant,
Richter & Tomasi Ltd.,
Brazil,
Joined Jan 2008
31
12:48 Feb-23-2015
Re: How to measure the CLADDING thickness
In Reply to Albera at 05:47 Feb-19-2015 (Opening).

Albera,
Both ToFD and Pulse-echo unit are suitable for this measurement. ToFD would be easier but PE may be used as well raising the gain up to see the interface echo of inconel - Carbon steel, than use echo to echo measurement.

1
 
 Reply 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
14:45 Feb-23-2015
Re: How to measure the CLADDING thickness
In Reply to Albera at 08:45 Feb-22-2015 .

"Is it 45MG Ultrasonic Thickness Gage (THRU-COAT) suits for finding the cladding thickness?"

I'm afraid that it is not. If you review our product literature, you will see that the ThruCoat software is designed for use with thin non-metallic coatings like paint and epoxy. Unfortunately it does not work with high impedance metallic coatings that are closely matched to the substrate.

As I wrote previously, given the very close impedance match between Incoloy and typical carbon steels, the success of any ultrasonic thickness measurement technique involves detection of a bondline echo that will be very small at best and may not be visible at all.

1
 
 Reply 
 
Neil Burleigh
Sales
Krautkramer Australia Pty Ltd, Australia, Joined Dec 2002, 158

Neil Burleigh

Sales
Krautkramer Australia Pty Ltd,
Australia,
Joined Dec 2002
158
23:13 Feb-23-2015
Re: How to measure the CLADDING thickness
In Reply to Tom Nelligan at 14:45 Feb-23-2015 .

Dear Albera,
We used to do this inspection many years ago and when I started in the inspection department this inspection was carried out using a 10 MHz twin crystal probe and an ultrasonic flaw detector. It was not a very good inspection due to the close acoustic match between the inconel and the carbon steel, what we were essentially trying to detect with the ultrasonic inspection was a poor bond. It was a slow and laborious task. We ended up getting a magnetic type paint gauge with a measuring range of up 5 mm of non magnetic coating. The test time was reduced to less than 30 sec where previously we scanned the whole area hoping to pick up a poorly bonded area, which sometimes you had to careful not to mistake a reflection from an inclusion for the interface. The test time was around 5 - 10 mins and was not conclusive.
Go and get a paint gauge it is a much more sensible approach.
reagrds

Neil Burleigh

1
 
 Reply 
 
Albera
NDT Inspector,
HI-TECH ISPECTION SERVICES L.L.C, OMAN, India, Joined Nov 2011, 3

Albera

NDT Inspector,
HI-TECH ISPECTION SERVICES L.L.C, OMAN,
India,
Joined Nov 2011
3
10:06 Feb-25-2015
Re: How to measure the CLADDING thickness
In Reply to John at 11:31 Feb-23-2015 .

Mr.John,
I have to inspect from the clad side.

 
 Reply 
 

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