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Technical Discussions
Andrés
Andrés
22:32 Nov-25-2019
TFM limitations

Hello, I have any doubts about TFM.

We all know the advantages, but the disadvantages?

Which disadvantage has TFM with respect to PAUT or TOFD.

Another question I have:
Can TFM detect transverse weld cracks in a normal scan?

Regards

 
 Reply 
 
Matthias Dreifeld
NDT Inspector, CEO
Dreifeld Materialprüftechnik, Germany, Joined Sep 2005, 104

Matthias Dreifeld

NDT Inspector, CEO
Dreifeld Materialprüftechnik,
Germany,
Joined Sep 2005
104
10:44 Nov-26-2019
Re: TFM limitations
In Reply to Andrés at 22:32 Nov-25-2019 (Opening).

Some obvious disadvantages as far as handling goes:
- files sizes are huge
- scan speeds are slow

Go to:
https://www.olympus-ims.com/en/resources/faqs/frequently-asked-questions-about-tfm/

and read the last question. I think the way they wrote it is very "feet to the ground".

 
 Reply 
 
Carlos
Sales, Latin America
Zetec, Inc., USA, Joined Apr 2012, 4

Carlos

Sales, Latin America
Zetec, Inc.,
USA,
Joined Apr 2012
4
15:45 Nov-26-2019
Re: TFM limitations
In Reply to Andrés at 22:32 Nov-25-2019 (Opening).

Andrés,

Agree with Matthias about the scan speed and files sizes, you cannot do much about this.

Remember, TFM is only an additional tool in the phased array UT toolkit to improve flaw resolution and inspection coverage; in fact, PAUT and TOFD can be complemented with TFM for characterization. Like in PAUT, active aperture and frame resolution are key parameters.

For specific applications, like HTHA or the one you mention below, you still need to choose the right probe (wave mode, frequency) for a successful inspection with PAUT/TOFD.

 
 Reply 
 
JIM
JIM
03:58 Nov-27-2019
Re: TFM limitations
In Reply to Carlos at 15:45 Nov-26-2019 .

can TFM just scan from one side found the opposite side bevel LOF ,such as pipe to fiting.

 
 Reply 
 
Carlos
Sales, Latin America
Zetec, Inc., USA, Joined Apr 2012, 4

Carlos

Sales, Latin America
Zetec, Inc.,
USA,
Joined Apr 2012
4
23:50 Nov-27-2019
Re: TFM limitations
In Reply to JIM at 03:58 Nov-27-2019 .

With TFM we have access to propagation modes of inspection, it is the job of the UT operator to select the right TFM mode to detect this defect in one side of the bevel or the other.

Wave modes:
Direct (LL or TT)
Corner (LLL or TTT)
Indirect (LLLL or TTTT)

As one of my colleagues posted in another thread, remember to use the same basic principles with TFM as for PAUT 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).

 
 Reply 
 

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