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- since 1996 -

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Technical Discussions
j&j
Spain, Joined Jul 2014, 2

j&j

Spain,
Joined Jul 2014
2
13:36 Jul-31-2014
ToFD Indications HELP
zoom image

Dear all.

i'm having some problems trying to understand what are those indications.
As you can see they are under LW and over Cladding and looks very straight, also you can find some indications in mode converted zone...
Could anyone help me? What could it be?
Thank you all.

 
 Reply 
 
Nigel Armstrong
Nigel Armstrong
18:33 Jul-31-2014
Re: ToFD Indications HELP
In Reply to j&j at 13:36 Jul-31-2014 (Opening).

Please give some test conditions, nature of test piece, TOFD set-up, thickness of cladding.

 
 Reply 
 
Martin
Martin
21:15 Jul-31-2014
Re: ToFD Indications HELP
In Reply to j&j at 13:36 Jul-31-2014 (Opening).

Laminations in the parent material.

 
 Reply 
 
j&j
Spain, Joined Jul 2014, 2

j&j

Spain,
Joined Jul 2014
2
22:16 Jul-31-2014
Re: ToFD Indications HELP
In Reply to Nigel Armstrong at 18:33 Jul-31-2014 .

Dear all, thanks for your answers.
This is a test of a pressure vessel, which is in service. It has a nominal thickness of steel and cladding 23 +6. the bezel is double K and the welding process is SMAW. ToFD configuration is 5mhz, with diameter 3 to 66%. also noted that the scanning surface is irregular, having small cavitation corrosion.

I thought about lamination, but this kind of image is repeated in different welds.

Thank you all.

 
 Reply 
 
Gokul Hrishikesh
NDT Inspector, PCN UT Level 3
India, Joined Jul 2013, 73

Gokul Hrishikesh

NDT Inspector, PCN UT Level 3
India,
Joined Jul 2013
73
20:42 Aug-01-2014
Re: ToFD Indications HELP
In Reply to j&j at 22:16 Jul-31-2014 .

J,

I can almost read 2nd and 3rd image.

The indication is so parallel to the surface and I am sure it should be a lamination.
We cannot see any data such as how long, how much you have zoomed it in the scan direction.
The weld as I see there is good, of all the welding process I came across I never found a defect so parallel to surface in the weld volume... there is lamination in parent material.
Check it with a T/R probe.
Who knows the other welds you scanned might had a laminations in parent material.
I would suggest to check them all for Laminations if possible... Seek advise from your Level3!

Regards,
Gokul

 
 Reply 
 
mark
mark
07:18 Aug-02-2014
Re: ToFD Indications HELP
In Reply to Gokul Hrishikesh at 20:42 Aug-01-2014 .

For me images 1 and 2 1st is look Likes inter run lof in the root area.in double v joint after gouging and welding of root, this indication will appear.

Regards
Mark

 
 Reply 
 
Michael Rotondella
NDT Inspector, Welding Inspector
Applus RTD, Australia, Joined Dec 2012, 1

Michael Rotondella

NDT Inspector, Welding Inspector
Applus RTD,
Australia,
Joined Dec 2012
1
11:43 Aug-07-2014
Re: ToFD Indications HELP
In Reply to j&j at 13:36 Jul-31-2014 (Opening).

Hi,

I have come across this a few times before. Every time i have come across this it has been specific to the vessel shell and usually occurs with thicker shell plates. Aligned rolling inclusions very parallel to the surface. I think it has to do with the fabrication of the vessel shell. If you take a normal 0 degree probe and place it on the shell away from the weld you will probably find these small amp inclusions all over the vessel at about midway through the plate. They will most likely be all at the same depth.

 
 Reply 
 
carlos correia
R & D, - -
UCV & EGROUP, Venezuela, Joined Oct 2008, 120

carlos correia

R & D, - -
UCV & EGROUP,
Venezuela,
Joined Oct 2008
120
03:10 Aug-08-2014
Re: ToFD Indications HELP
In Reply to Michael Rotondella at 11:43 Aug-07-2014 .

try with 2 MHz...

 
 Reply 
 

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