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Technical Discussions
Christian Duenas
NDT Inspector,
Corporación POK, Mexico, Joined May 2016, 5

Christian Duenas

NDT Inspector,
Corporación POK,
Mexico,
Joined May 2016
5
20:23 May-04-2016
UT whit delay line

Hi to every one

Im new in this page and i think is a a great page to learn about another countrys and his NDt´s
well i have a question
I try to know how to calibrate a transducer whit delay line and how can in interpret these
Im using a transducer sonatest RDT 5025 delay line whit a machine Sonatest 250s how can i calibrate the distance to inspect a wall less than a 1 inch and how can interpret a discontinuity can be on the wall.

regards!

 
 Reply 
 
Philippe Rioux
R & D, Sonatest
Sonatest, Canada, Joined Jan 2015, 37

Philippe Rioux

R & D, Sonatest
Sonatest,
Canada,
Joined Jan 2015
37
21:22 May-04-2016
Re: UT whit delay line
In Reply to Christian Duenas at 20:23 May-04-2016 (Opening).

Dear Christian,
I am going to share you the ss140 user manual. It has a section with immersion testing and the behaviour with a delay line is almost the same.
Your will have to set your probe zero at the wedge interface echo and set the velocity according to your cal. block.

See your outlook, the file will be there,

Regards,

Philippe

 
 Reply 
 
Christian Duenas
NDT Inspector,
Corporación POK, Mexico, Joined May 2016, 5

Christian Duenas

NDT Inspector,
Corporación POK,
Mexico,
Joined May 2016
5
23:56 May-04-2016
Re: UT whit delay line
In Reply to Philippe Rioux at 21:22 May-04-2016 .

hi Philippe i read the document you send me, i understand method but my problem is the delay line creates me a lot relay lines on the wall and i want to inspect betwen delay line and back wall, another question may i create a DAC whit a delay line transducer? may i send you images to explain better!


Regards!

 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 850

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
850
01:47 May-05-2016
Re: UT whit delay line
In Reply to Philippe Rioux at 21:22 May-04-2016 .

Christian,
You don't give much information, but I suspect that your delay shoe is not appropriate for what you are trying to accomplish. Normally you would like to set your screen so that the second echo of your delay line is not on the screen or that your back wall is before your second delay.

 
 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
06:04 May-05-2016
Re: UT whit delay line
In Reply to Christian Duenas at 20:23 May-04-2016 (Opening).

Please give better explanation. How long is the delay line?

 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 523

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
523
10:20 May-05-2016
Re: UT whit delay line
In Reply to Christian Duenas at 20:23 May-04-2016 (Opening).

Christian

From memory the Delay line on the RDT 5025 is around 20mm long, The velocity of rexolite is around 2330 m/s, in steel it is around 5920 m/s, so the length of the delay line will correspond to around 20 x (5.92/2.33) i.e equivalent to about 50mm in steel.

Make sure there is couplant between the probe and the delay line
set your range to around 200mm, delay to zero and your probe zero to zero.

you should see a pattern of echoes at approx 50mm intervals.

Adjust the probe zero so that the first echo is at the left side of the screen. Then reduce the range to approx 50mm. the first repeat echo should be near the Right end of the screen.

Then put the probe on a steel test block of less than 25mm, you should see one clean echo around the centre of the screen (assuming 25mm) and one in about the same place as the echo from the delay.

You should now be able to calibrate gain etc. using the test block as normal.

Good luck.

Joe

 
 Reply 
 
Christian Duenas
NDT Inspector,
Corporación POK, Mexico, Joined May 2016, 5

Christian Duenas

NDT Inspector,
Corporación POK,
Mexico,
Joined May 2016
5
16:59 May-05-2016
Re: UT whit delay line
In Reply to Joe Buckley at 10:20 May-05-2016 .


Joe

Thank you i did exactly what you say and now i can read the screen and interpret the delay line and where starts this one i glad all support from this forum.
i hope can help like you help me.

Regards!

 
 Reply 
 
Christian Duenas
NDT Inspector,
Corporación POK, Mexico, Joined May 2016, 5

Christian Duenas

NDT Inspector,
Corporación POK,
Mexico,
Joined May 2016
5
18:38 May-18-2016
Re: UT whit delay line
In Reply to Christian Duenas at 16:59 May-05-2016 .

hi again

i have a new question about delay line

it is possible calibrate a DAC whit a probe whit delay line? if i can do that how would it be?
or first i need do a DAC only whit a probe and after put it a delay line?

Regards!!

 
 Reply 
 
James Scalf
NDT Inspector,
Global Integrity, Canada, Joined Oct 2012, 273

James Scalf

NDT Inspector,
Global Integrity,
Canada,
Joined Oct 2012
273
19:21 May-18-2016
Re: UT whit delay line
In Reply to Christian Duenas at 18:38 May-18-2016 .

Christian,

You would generate your DAC with the delay line shoe installed. Move the IP from the exit of the face of the delay line to Zero point on your screen and proceed with the standard DAC setup. If you create the DAC first then install the delay line your sensitivity can (and will) be affected. Cheers...

James

 
 Reply 
 

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