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23:25 Apr-29-2019 https://www.ndt.net/forum/thread.php?msgID=74719#74719 Re: T-joint with backing metal strip - phantom signal during ultrasonic test. In Reply to Angel at 19:47 Apr-29-2019 (Opening).
Angel,
phantom signals are generated by bad regulation of repetion rate and long paths.
The term is not suitable for the description of signals produced exclusively by geometry.
However if you are referring to geometric signals, see previous posts related to this configuration weld and also welds in general.
greetings
mario
Clair D'El Rei NDT Inspector, I am looking for a new opportunity in the labor market and I accept proposals from other countries i, Brazil, Joined Feb 2019, 15
Clair D'El Rei NDT Inspector, I am looking for a new opportunity in the labor market and I accept proposals from other countries i, Brazil, Joined Feb 2019 15
15:57 Apr-30-2019 https://www.ndt.net/forum/thread.php?msgID=74725#74725 Re: T-joint with backing metal strip - phantom signal during ultrasonic test. In Reply to Angel at 19:47 Apr-29-2019 (Opening).
You have to send the configuration of the bevel, usually backing metal are placed in joints with penetration in only one side, on quina and tuppo joints. But if there is a melting between the melting puddle and the backing metal, there will be reflections beyond the base metal and they are not phantom echoes.
18:02 Apr-30-2019 https://www.ndt.net/forum/thread.php?msgID=74726#74726 Re: T-joint with backing metal strip - phantom signal during ultrasonic test. In Reply to Clair D'El Rei at 15:57 Apr-30-2019 .
Thanks for replies
My English isn't good.
I read that it is possible to make a mistake and evaluate such a joint as a lack of penetration and I don't understand it. I don't know if phantom signal is a good term for this situation.
What Mario wrote about it , this is definitely phantom signal. My case, I don't know what name is the most properly
00:08 May-01-2019 https://www.ndt.net/forum/thread.php?msgID=74728#74728 Re: T-joint with backing metal strip - phantom signal during ultrasonic test. In Reply to Angel at 18:02 Apr-30-2019 .
Angel,
the pulse repetition rate (PRF) must be set low enough to allow time for the most distant echoes
to return before sending the next impulse. If the signal is produced by an interference of this type, just touch up the value set in the PRF to make the signal disappear. Check your basic: this topic is well treated.
Instead the geometry signals are an inevitable physical circumstance, to be recognized and circumvented.
Geometrical indications in a joint with backing are the same as for the configuration without backing, with the addition of any reflections coming from the edges or irregularities of the backing. The reflections from the backing should not be confused with presumed indications of defect. It is therefore sufficient to do some additional checks.
I hope this can direct you: knowing that something can be done will help us do it.
Greetings
Mario
08:55 May-01-2019 https://www.ndt.net/forum/thread.php?msgID=74729#74729 Re: T-joint with backing metal strip - phantom signal during ultrasonic test. In Reply to Mario Talarico at 00:08 May-01-2019 .
Let's go to the sketch sent by Clair D'El Rei.
Sygnał z grani jest głębiej od grubości płyty.
What cause signal before then signal from the thickness of the plate?
The first signal is caused by the transformation of the transverse wave into the longitudinal one and so returns faster to the transducer?
21:01 May-01-2019 https://www.ndt.net/forum/thread.php?msgID=74736#74736 Re: T-joint with backing metal strip - phantom signal during ultrasonic test. In Reply to Angel at 08:55 May-01-2019 .
Angel,
Clair D'El Rei's sketch is a butt weld, not a T.Joint!
Assuming you are scanning a 1/2 v joint from the beveled side, it must be definitely clear that if the T-Joint has been welded without defects in root, whatever happens to the beam entering the backing, its path will always be greater than that produced by a plate thickness. This signal can get confused with signals inside the thickness detected in rebond scanning, ..... but only in rebond! This is the only small confusion that backing can bring, and therefore to be verified, for the rest the usual rules of a non-backing joint apply.
I also want to point out that, in the case of a T-Joint with backing, normally ½ V, all signals with a path lower than those produced by a thickness must be considered defects and never attributable to the geometry of the root, as could happen instead in the case of a butt-weld.
Of course we are all out to make mistakes and the chances that the path is shorter than the thickness is a false call are unfortunately still possible.
To try adding something, I think, you should add more information and maybe a sketch. 1) Beveled side: thickness; flat or curved surface and - if curved - concave or convex; accessibility back; angle, frequence and probe size. 2) Not-beveled side: as above, in addition, does this plate continue after the root so that you can do two angled opposite scans or end up on par with the root? 3) Is the indication detected directly, before the first leg, or in rebond?
21:39 May-01-2019 https://www.ndt.net/forum/thread.php?msgID=74738#74738 Re: T-joint with backing metal strip - phantom signal during ultrasonic test. In Reply to Mario Talarico at 21:01 May-01-2019 .
Of course I know that the weld on the sketch is a butt weld.
The matter we are discussing is hypothetical. I just read about the problems in the interpretation of signals with joint with backing metal strip. I dont understend how can confuse "true" signal with "false" signal
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