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- since 1996 -

Canadian Institute for NDE
We are specialized in training for Radiography, Ultrasonics, Magnetic Particle, Liquid Penetrant, Eddy Current and emerging NDT technologies.
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Technical Discussions
Prawlings
Consultant, ndt technician
United Kingdom, Joined Jan 2011, 3

Prawlings

Consultant, ndt technician
United Kingdom,
Joined Jan 2011
3
21:36 Jan-25-2013
Spurious signals

While testing a 12.5mm CS pipe weld with a J prep using the 70 degre probe, there was a signal from both sides of the weld plotting just outside the weld body in the haz. The signal looked like a lack of fusion, I didn't see it with the 60 degree do you think this is mode conversion off the root bead ?

 
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mohsen
NDT Inspector,
arta industry testing, Iran, Joined Jan 2013, 19

mohsen

NDT Inspector,
arta industry testing,
Iran,
Joined Jan 2013
19
11:15 Jan-26-2013
Re: Spurious signals
In Reply to Prawlings at 21:36 Jan-25-2013 (Opening).

Hi
I think this signal is from HIGH-LOW of pipelines or maybe because of excessive penetration of weld in root weld. yet if you see this signal in whole of welds you can ignore it, but if you can see the RT film of weldment you can be sure that it isn't LOP. of course probably at hours of 5 to 7 weldment in RT film you can't see the visible film (in terms of components that need to Clean Inside)

 
 Reply 
 
prawlings
Consultant, ndt technician
United Kingdom, Joined Jan 2011, 3

prawlings

Consultant, ndt technician
United Kingdom,
Joined Jan 2011
3
13:11 Jan-26-2013
Re: Spurious signals
In Reply to mohsen at 11:15 Jan-26-2013 .

cheers mohsen, we cant rt these welds, but you have put my mind at rest.

 
 Reply 
 
Jon Wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

Jon Wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
13:14 Jan-26-2013
Re: Spurious signals
In Reply to Prawlings at 21:36 Jan-25-2013 (Opening).

Difficult to say with the limited information you have given. Do the echos from both sides of the weld plot to the same position in the cross section or have you got 2 distinct echos from the same depth in the weld, iow an indication on both sides of the weld prep? Did you locate the indications at half skip or full skip? How far outside the weld body did you plot the indication? If you suspect mode conversion then your echo will need to be reflecting off the root or some other non plan parallel surface, plot the indication accurately on paper as you would have learnt in your level 2 training. Otherwise get hold of an old fashioned analogue flaw detector, locate the echo and try with a wet finger to dampen the echo.

 
 Reply 
 
Mario Talarico
NDT Inspector,
Italy, Joined May 2010, 423

Mario Talarico

NDT Inspector,
Italy,
Joined May 2010
423
18:51 Jan-26-2013
Re: Spurious signals
In Reply to Prawlings at 21:36 Jan-25-2013 (Opening).

Hi Prawlings,
"signal from Both Sides of the weld plotting just outside the weld body in the haz" : you do not specify how this indication has been detected, but it is a typical candidate for geometrical indication (with a caution, because I've already met cases of LOF both side , especially if the welds are made with wire).
For your weld praparation, to exit the conjecture, classifies geometric if it is located beyond the center line. For safety repeat from the two sides of the weld.
And forget the X-rays: each time an operator UT asks to read the film of his work, by default, leave scpre points on the field.
Greetings

 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 869

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
869
03:53 Jan-27-2013
Re: Spurious signals
In Reply to Mario Talarico at 18:51 Jan-26-2013 .

Prawlings,

Just curious, what is your PRF setting?

 
 Reply 
 

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