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- since 1996 -
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Technical Discussions
kalaivanan
kalaivanan
05:43 Mar-19-2018
Eddy current on Carbonized plate and Electro plating

Dear Experts,
As we know eddy current testing on Non-metailic coating is applicable.

But I need some your guidance for the following cases.

Case 1. Carbonized ferrous plate.

Case 2. Carbonized Non-ferrous steel plate.

Case 3. Plated with Zn/Si/Au/Ni

for all the three above cases has the layer thickness of 20 - 30 μm.

I read from manual and codes it states eddy current has a minimum depth of penetration about 0.5 mm.

Can you suggest me is applicable or not?

Thanks in advance.

 
 Reply 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
09:46 Mar-19-2018
Re: Eddy current on Carbonized plate and Electro plating
In Reply to kalaivanan at 05:43 Mar-19-2018 (Opening).


Very much applicable.

Details depend on what you are looking for.

In any case, you have to make the calibration pieces with the same coatings/corbonizations

Good lcuck

P V SASTRY

 
 Reply 
 
Frank Lund
R & D,
United Kingdom, Joined Apr 2005, 221

Frank Lund

R & D,
United Kingdom,
Joined Apr 2005
221
11:52 Mar-19-2018
Re: Eddy current on Carbonized plate and Electro plating
In Reply to kalaivanan at 05:43 Mar-19-2018 (Opening).

kalaivanan,

The stadard penetration depth at any frequency is very much less in ferritic steels than it is in austenitic stainless steels and other non-magnetic steels.

My first thought is to worry about the regularity of a carbonising surface treatment, whether variations in that would give rise to background signals as you scan plate treated that way.

Frank

 
 Reply 
 

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