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Technical Discussions
David Creak
Engineering
Academy of sciences of Budapest, Hungary, Joined Oct 2000, 1

David Creak

Engineering
Academy of sciences of Budapest,
Hungary,
Joined Oct 2000
1
03:53 Sep-28-2001
Looking for copper cladd thickness (0.5 mm) measurement by ultrasound method

Dear all,

I am looking for a ultrasound equipment which can measure the thickness of a copper cladd on steel. The copper thickness is 0.5 mm, the steel base is very thick. The expected accuracy is about 0.01 mm.

Is the eddy current method able to do this, too ?

Can you help ?

Thanks
David


    
 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 517

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
517
00:40 Sep-29-2001
Re: Looking for copper cladd thickness (0.5 mm) measurement by ultrasound method
This will be very difficult to do with Ultrasound, as the acoustic mismatch between steel and copper is not very great.

A standard magnetic induction type gauge (Sonatest do the Sonacoat F, there are several others available) should be able to measure as you require.

This is not precisely eddy current - a True eddy current gauge is unlikely to give very repeatable results as a frequency low enough to penetrate the copper will give readings very sensitive to variations in the steel substrate.

The accuracy of 0.01mm should be just about achievable, although bear in mind that, depending on how the copper is applied, there may well be some diffusion between the layers.

Good luck
Joe

: Dear all,
.
: I am looking for a ultrasound equipment which can measure the thickness of a copper cladd on steel. The copper thickness is 0.5 mm, the steel base is very thick. The expected accuracy is about 0.01 mm.
.
: Is the eddy current method able to do this, too ?
.
: Can you help ?
.
:Thanks
: David
.



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

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
07:11 Sep-29-2001
Re: Looking for copper cladd thickness (0.5 mm) measurement by ultrasound method
: I am looking for a ultrasound equipment which can measure the thickness of a copper cladd on steel. The copper thickness is 0.5 mm, the steel base is very thick. The expected accuracy is about 0.01 mm.


Assuming that the surface of the copper and the copper/steel bondlines are smooth, it should be possible to make your measurement with the right sort of ultrasonic equipment -- a precison thickness gage (NOT a gage designed for corrosion work) with a 20 MHz delay line transducer. Panametrics Model 25, 25DL, and 25DL PLUS gages fall into this category. The acoustic impedance mismatch between copper and steel is sufficient to produce detectable echoes if you use the proper equipment.

--Tom Nelligan
Panametrics, Inc.


    
 
 
Koenti
Koenti
00:14 Oct-30-2001
Re: Looking for copper cladd thickness (0.5 mm) measurement by ultrasound method
Dear,

can't you measure the thickness of your copper strip BEFORE you clad it around the steel? At this way you can simplify your test setup and increase the efficiency (flat wire instead of bended).

Must you measure the thickness over 360°?

Greetings,

Koenti
: Dear all,
.
: I am looking for a ultrasound equipment which can measure the thickness of a copper cladd on steel. The copper thickness is 0.5 mm, the steel base is very thick. The expected accuracy is about 0.01 mm.
.
: Is the eddy current method able to do this, too ?
.
: Can you help ?
.
: Thanks
: David
.



    
 
 
robin Enderby
robin Enderby
14:51 Aug-09-2011
Re: Looking for copper cladd thickness (0.5 mm) measurement by ultrasound method
In Reply to Joe Buckley at 00:40 Sep-29-2001 .

Help !
I have a Panametrix model 25 ultrasonic thickness meter.

I cant find out how to turn off the "klock" on the display. (key lock)

no info in the manual about this.

Regards,
robin

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

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
16:08 Aug-09-2011
Re: Looking for copper cladd thickness (0.5 mm) measurement by ultrasound method
In Reply to robin Enderby at 14:51 Aug-09-2011 .

Regarding the locked-up Model 25 gage, try a master reset:

--Press 2nd Function and then the IN/MM key
--Use the arrow keys to select SP-3 GAGE Reset, and press ENTER
--Press ENTER again to confirm the reset
--Press MEAS to resume formal operation.

    
 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 657

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
657
05:43 Aug-15-2011
Re: Looking for copper cladd thickness (0.5 mm) measurement by ultrasound method
In Reply to David Creak at 03:53 Sep-28-2001 (Opening).

Eddy current can be used provided the penetration depth is greater than the 0.5 mm copper clad. This measurement is possible because of the high permeability of Steel base. You will need copper clad with 0.1 mm incremental steps to establish calibration. Any portable ET machine with impedance plane display can be used along with an absolute surface probe. Frequency and probe dia selection is critical for penetration depth. The accuracy of 0.01 mm would be a challenge.

    
 
 

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