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LECOEUR ELECTRONIQUE
The Specialist of electronics for ultrasonic testing.

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Technical Discussions
vicor
,
personal, Canada, Joined Mar 2019, 5

vicor

,
personal,
Canada,
Joined Mar 2019
5
05:33 Mar-13-2019
TFM MODE SELECTION FOR DETECT DEFECT

anyone has experience about TFM device to guide me? Which mode is useful for detecting the flaws in the weld joints?
Generally, we have different wave modes :
• Direct (LL or TT)
• Corner (LLL or TTT)
• Indirect (LLLL or TTTT)

but for example for porosity, crack, lof, lop and so on .which one is better?
Also, anyone has the procedure to inspect the weld joint with TFM? ( please share with me )
Finally, how can I improve my knowledge about TFM INSPECTION, because I did not find any book or standard about that?

    
 
 
Patrick Tremblay
Sales, -
Zetec, Canada, Joined Nov 2010, 27

Patrick Tremblay

Sales, -
Zetec,
Canada,
Joined Nov 2010
27
15:33 Mar-13-2019
Re: TFM MODE SELECTION FOR DETECT DEFECT
In Reply to vicor at 05:33 Mar-13-2019 (Opening).

Hi Victor,

Even though it may seem complicated, TFM is still UT. For the detection of the types of weld defects listed in your post, you should use the same basic principles with TFM as for PA UT and conventional UT (i.e. to detect a LoF from the near side, bouncing SW off the backwall is going to give you the best results, so T-T). This being said, depending on the thickness of the weld and the frequency of your probe, you should pay a close attention to the number of points in your TFM frame in order not to undersample your data.

If you would like to improve your knowledge about the physics principles behind TFM, I suggest you to have a look at the recording of the webinar that Zetec has done on this topic in December 2018 (https://www.youtube.com/watch?v=VWz9YavSY5M). Otherwise, if you send me an email, I can send you some more literature.

2    
 
 
Vahhid
NDT Inspector,
Iran, Joined Dec 2015, 11

Vahhid

NDT Inspector,
Iran,
Joined Dec 2015
11
19:05 Mar-13-2019
Re: TFM MODE SELECTION FOR DETECT DEFECT
In Reply to Patrick Tremblay at 15:33 Mar-13-2019 .

Hi dear , please share with me TFM literature

    
 
 
Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1254

Edward Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1254
19:56 Mar-13-2019
Re: TFM MODE SELECTION FOR DETECT DEFECT
In Reply to Vahhid at 19:05 Mar-13-2019 .

Vahhid, in the post on this thread just prior to your question, Patrick Tremblay provided you an excellent resource on the topic.
On a parallel thread on NDT.net (https://www.ndt.net/forum/thread.php?admin=&forenID=0&msgID=74319&rootID=74307#74319) there was discussion on the topic as well. J.B noted there are MANY papers on NDT.net that you need only search on the NDT.net search engine.
But perhaps people have missed an excellent remark by Amnol Birring on that same thread...
He advised to read about SAFT (synthetic aperture focussing technique). The acronyms TFM/FMC/IWEX/SPA seem to be attempts by the NDT industry to re-invent the SAFT process as their own. In fact the idea in ultrasonic imaging goes back to 1972 (C. B. Burckhardt, P.A. Grandchamp, and H. Hoffmann, "An Experimental 2Mhz Synthetic Aperture Sonar System Intended for Medical Use," IEEE Transactions on Sonics and Ultrasonics, vol. 21, no. 1, pp. 1-6, 1974).

1    
 
 
victor
,
personal, Canada, Joined Mar 2019, 5

victor

,
personal,
Canada,
Joined Mar 2019
5
22:46 Mar-13-2019
Re: TFM MODE SELECTION FOR DETECT DEFECT
In Reply to Patrick Tremblay at 15:33 Mar-13-2019 .

watts.victor1986@gmail.com

Could you please share the literature about TFM and also I read some document and I am confused about something.
I appreciate in short sentences explain that for me, what is the difference between a Phased array, VTFM, TFM and DDF including advantages and disadvantages on the weld joints?
Also, what is the difference these methods with respect to resolution, sensitivity, focusing, sizing and detection? (which technique is better for which one).

    
 
 
Patrick Tremblay
Sales, -
Zetec, Canada, Joined Nov 2010, 27

Patrick Tremblay

Sales, -
Zetec,
Canada,
Joined Nov 2010
27
16:41 Mar-14-2019
Re: TFM MODE SELECTION FOR DETECT DEFECT
In Reply to victor at 22:46 Mar-13-2019 .

Victor, I just sent you some documentation by email. I hope you will find it interesting.

For anyone interested in the underlying physics of FMC/TFM, in addition to the webinar mentioned in my previous post and the many articles available on ndt.net (thanks for the references Mr. Ginzel!), a white paper can be downloaded from Zetec's website: https://www.zetec.com/advanced-focusing-techniques/

    
 
 
JIM
NDT Inspector,
cooec, China, Joined Oct 2010, 3

JIM

NDT Inspector,
cooec,
China,
Joined Oct 2010
3
16:02 Jun-25-2019
Re: TFM MODE SELECTION FOR DETECT DEFECT
In Reply to Patrick Tremblay at 16:41 Mar-14-2019 .

Hi,Tremblay,i just want to learn more information about FMC, but i can't get the white paper on zetec website,even i have filled all the information on zetec website, but it notified i am failed. so, can you give some documents if you are convenient,thank you .

    
 
 
Patrick Tremblay
Sales, -
Zetec, Canada, Joined Nov 2010, 27

Patrick Tremblay

Sales, -
Zetec,
Canada,
Joined Nov 2010
27
19:22 Jun-25-2019
Re: TFM MODE SELECTION FOR DETECT DEFECT
In Reply to JIM at 16:02 Jun-25-2019 .

JIM,
A Zetec representative from China will shortly get in touch with you.

    
 
 
Frederic Reverdy
Sales,
Eddyfi, France, Joined Aug 2016, 9

Frederic Reverdy

Sales,
Eddyfi,
France,
Joined Aug 2016
9
19:40 Jun-27-2019
Re: TFM MODE SELECTION FOR DETECT DEFECT
In Reply to vicor at 05:33 Mar-13-2019 (Opening).

Dear Victor,

I don't know if you are still looking for answers but our customers have been using the Gekko with real-time TFM for over 4 years now. And by experience, the easiest mode to use for weld inspection is the TT one (or LL for stainless steel welds).

If you define a TFM area with a height of twice the thickness, you should have something very similar to a PAUT inspection for which high angles are looking at the bottom of the weld directly and low angles are looking at the chamfer and volume after a skip.

TFM is less sensitive to probe positioning as the energy is focused everywhere increasing the sensitivity of detection of indications.

Let me know if you need more information.

    
 
 
langtuteng2
Armenia, Joined Nov 2014, 158

langtuteng2

Armenia,
Joined Nov 2014
158
15:24 Jun-28-2019
Re: TFM MODE SELECTION FOR DETECT DEFECT
In Reply to Patrick Tremblay at 15:33 Mar-13-2019 .

hello, patrick! nowadays, I also studied the TFM and the relative equipment. could you send me some more information? thanks. my email:ndtkui@163.com

    
 
 
Patrick Tremblay
Sales, -
Zetec, Canada, Joined Nov 2010, 27

Patrick Tremblay

Sales, -
Zetec,
Canada,
Joined Nov 2010
27
16:11 Jun-28-2019
Re: TFM MODE SELECTION FOR DETECT DEFECT
In Reply to langtuteng2 at 15:24 Jun-28-2019 .

Hi. A Zetec application engineer will contact you shortly to provide you the information you are looking for.

    
 
 
Philippe Rioux
R & D, Sonatest
Canada, Joined Jan 2015, 35

Philippe Rioux

R & D, Sonatest
Canada,
Joined Jan 2015
35
21:27 Jul-03-2019
Re: TFM MODE SELECTION FOR DETECT DEFECT
In Reply to Patrick Tremblay at 16:11 Jun-28-2019 .

Vicor,
You can check out our comparison through different technique. We need indeed spot major amplitude drops compared to PA. Those amplitude drops are also present in TFM for mode to mode. We found other writers that supports that theory (and our results!) It is actually another paper in our references section; a CIVA partnership.

Enjoy the readings!

1    
 
 

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