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Technical Discussions
VASANTH
NDT Inspector,
NDTS India P Ltd, India, Joined Apr 2012, 8

VASANTH

NDT Inspector,
NDTS India P Ltd,
India,
Joined Apr 2012
8
13:43 Apr-30-2012
TOFD queries

Dear all,

Here we want some guidance and support from you regarding the queries on TOFD.

We are offered to scan 190 mm block and we chosed the wedge angle and probes according to the codes mentioned in ASME sec V and scanned with 3 set ups.
With the calibration blocks we confirmed the lateral wave and backwall echoes for the respective channels whichever is applicable.
We confirmed the timings for the lateral wave and the backwall with respect to the formulae for those both with correct PCS and found that it was correct.

Let us explain you how the setup was done:
We took a calibration block of 6 SDH (with sizes according to ASME).

In the first channel we kept the lateral wave to the starting position of A scan and the echo from 2nd hole to the end position of A scan.

In the second setup we kept the 3rd hole to the starting position of A scan and backwall echo to the end position of A scan. (here we are confused whether to keep the 3rd hole in the starting position or keep the lateral wave in the starting position, please let us know)

In the third setup we kept the 5th hole to the starting position of A scan and backwall echo to the end position of A scan. (here we are confused whether to keep the 5th hole in the starting position or we want to know how the setup for this channel should be done, please let us know)

Vasanth.

 
 Reply 
 
massimo carminati
Consultant, AUT specialist
IMG Ultrasuoni Srl, Italy, Joined Apr 2007, 691

massimo carminati

Consultant, AUT specialist
IMG Ultrasuoni Srl,
Italy,
Joined Apr 2007
691
17:29 Apr-30-2012
Re: TOFD queries
In Reply to VASANTH at 13:43 Apr-30-2012 (Opening).

According to the code, acceptable performance is determined when, on each tofd setup, the last hole of the adjacent tofd setup is detected. In this case, you need to detect what follows:
1st tofd, holes 1 to 3
2nd tofd, holes 2 to 5
3rd tofd, holes 4 to 6.

About Tofd ranges, I would certainly start with the lateral wave with all the channels and keep converted mode signal with at least deeper tofd setup.

Remember that you need to demonstrate your setup with offset according to code, or you need to perform 3 scans (1 centered, 2 with offset).
Another point is that in my opinion 3 TOFD without a dedicated Creep Wave setup for LW dead zone coverage would not be able to demonstrate acceptably.

 
 Reply 
 
VASANTH
NDT Inspector,
NDTS India P Ltd, India, Joined Apr 2012, 8

VASANTH

NDT Inspector,
NDTS India P Ltd,
India,
Joined Apr 2012
8
07:06 May-02-2012
Re: TOFD queries
In Reply to massimo carminati at 17:29 Apr-30-2012 .

Dear massimo,

Thank yo soo much fa ur response.
In one more thing can u guide me, suppose if i don't have a calibration block with side drilled holes can i perform the setup calibration with a block which has no SDH?? in tat case how will i decide the zones coverage??

 
 Reply 
 
massimo carminati
Consultant, AUT specialist
IMG Ultrasuoni Srl, Italy, Joined Apr 2007, 691

massimo carminati

Consultant, AUT specialist
IMG Ultrasuoni Srl,
Italy,
Joined Apr 2007
691
21:56 May-02-2012
Re: TOFD queries
In Reply to VASANTH at 07:06 May-02-2012 .

You need SDH to prove coverage, even if you could set sensitivity on the LW and the background noise level-

 
 Reply 
 
VASANTH
NDT Inspector,
NDTS India P Ltd, India, Joined Apr 2012, 8

VASANTH

NDT Inspector,
NDTS India P Ltd,
India,
Joined Apr 2012
8
06:50 May-03-2012
Re: TOFD queries
In Reply to massimo carminati at 21:56 May-02-2012 .

Greetings....!!!!

Can yo please inform what are all the standards available for TOFD accordance with ASME. i found ASME E2373 is available. any others??

Best regards.

 
 Reply 
 
VASANTH
NDT Inspector,
NDTS India P Ltd, India, Joined Apr 2012, 8

VASANTH

NDT Inspector,
NDTS India P Ltd,
India,
Joined Apr 2012
8
09:53 May-04-2012
Re: TOFD queries
In Reply to massimo carminati at 21:56 May-02-2012 .

Greetings..!!

can TOFD inspection be done on a tapered plate thickness weld, tapering from 22 mm to 13 mm?

Thanking you.

 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
05:43 May-08-2012
Re: TOFD queries
In Reply to VASANTH at 09:53 May-04-2012 .

Vasanth

From your public personal and "stand"information you work for a "Consulting, Agency, Training, Manufacturer, Inspection" company with 14 colleagues registered on ndt.net. I do hope that the knowledge you required in your last two unanswered posts has been successfully addressed in fruitful discussions with these colleagues.

I yearn for a face to face discussion on NDT matters with colleagues.

 
 Reply 
 
Malcolm Hill
United Kingdom, Joined Jun 2012, 14

Malcolm Hill

United Kingdom,
Joined Jun 2012
14
12:37 Jul-23-2012
Re: TOFD queries
In Reply to VASANTH at 09:53 May-04-2012 .

Yes is the east answer - but you have to assure the transmit and recieve are positioned correctly so there is no reflection off the taper/chanfer face
regards
Malcolm Hill TOFD specialist since 2003

 
 Reply 
 
Radoslaw
NDT Inspector, Materials Engineer
Poland, Joined Apr 2012, 51

Radoslaw

NDT Inspector, Materials Engineer
Poland,
Joined Apr 2012
51
18:55 Jul-28-2012
Re: TOFD queries
In Reply to massimo carminati at 21:56 May-02-2012 .

Massimo,
Could you explain how to set PCS 1st, 2nd, 3rd pairs of probes for 190mm block to cover all thickness, what's the rules for testing that thic walls? I have never testing yet that thickness that I am saking

regards

 
 Reply 
 
massimo carminati
Consultant, AUT specialist
IMG Ultrasuoni Srl, Italy, Joined Apr 2007, 691

massimo carminati

Consultant, AUT specialist
IMG Ultrasuoni Srl,
Italy,
Joined Apr 2007
691
18:12 Jul-29-2012
Re: TOFD queries
In Reply to Radoslaw at 18:55 Jul-28-2012 .

Too difficult to explain, especially if probes and wedges selection is not known. I normally would use 3 tofd setups plus creep wave long focus from both sides. (I normally use 5 and 4 Mhz with remote preamp for Tofd and IMG creep waves LF series).

 
 Reply 
 
Radoslaw
NDT Inspector, Materials Engineer
Poland, Joined Apr 2012, 51

Radoslaw

NDT Inspector, Materials Engineer
Poland,
Joined Apr 2012
51
23:16 Jul-29-2012
Re: TOFD queries
In Reply to massimo carminati at 18:12 Jul-29-2012 .

For example, 200mm thick weld,
Could you give some arrangement of probes for testing that joint by TOFD method? I mean probes, focus, wedges, PCS, frequency, calculations etc

regards

Maybe somebody else??

 
 Reply 
 
massimo carminati
Consultant, AUT specialist
IMG Ultrasuoni Srl, Italy, Joined Apr 2007, 691

massimo carminati

Consultant, AUT specialist
IMG Ultrasuoni Srl,
Italy,
Joined Apr 2007
691
06:00 Jul-30-2012
Re: TOFD queries
In Reply to Radoslaw at 23:16 Jul-29-2012 .

Asking is legal, answering is a courtesy. I believe that this is not a place for free-consultancy, but an open access site.
Anyway, if you would like me to develop a scan plan, please write me and I will send you a quote for my desk review fee.

 
 Reply 
 

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