where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -
336 views
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, 100

Matthias Dreifeld

NDT Inspector, CEO
Dreifeld Materialprüftechnik,
Germany,
Joined Sep 2005
100
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
NDT Inspector,
cooec, China, Joined Oct 2010, 15

JIM

NDT Inspector,
cooec,
China,
Joined Oct 2010
15
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 
 

Product Spotlight

MUSE Mobile Ultrasonic Equipment

The MUSE, a portable ultrasonic imaging system, was developed for in-field inspections of light-weig
...
ht structures. The MUSE consists of a motor-driven manipulator, a water circulation system for the acoustic coupling and a portable ultrasonic flaw detector (USPC 3010). The MUSE provides images of internal defects (A-, B-,C- and D-scan).
>

Immersion systems

ScanMaster ultrasonic immersion systems are designed for high throughput, multi shift operation in a
...
n industrial or lab environment. These fully integrated systems provide various scanning configurations and incorporate conventional and phased arrays technologies to support diverse applications, such as inspection of disks, bars, shafts, billets and plates. All of ScanMaster immersion systems are built from high accuracy scanning frames allowing for scanning of complex parts and include a multi-channel ultrasonic instrument with exceptional performance. The systems are approved by all major manufacturers for C-scan inspection of jet engine forged discs. Together with a comprehensive set of software modules these flexible series of systems provide the customer with the best price performance solutions.
>

NovaScope 6000

The all-digital Novascope 6000 is a portable, ultra-high precision thickness gauge for high-speed
...
thickness measurement. Novascope 6000 has unmatched capabilities and unique features including: •Superior Resolution with high contrast, high-speed color RF display •High pulser voltage •Real-time video output •Increased internal/external data storage •Programmable SetUp features •Battery & AC Powered
>

NEOS III

NEOS III is Logos Imagings lightest DR system. With a built-in battery and internal wireless commu
...
nication, the NEOS III is perfect for users that want to quickly assess an item.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window