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Technical Discussions
Paul H
,
USA, Joined Feb 2020, 3

Paul H

,
USA,
Joined Feb 2020
3
19:49 Feb-19-2020
DAC with Basic Cal Block

Hello,

I am seeking a calculator or instructions on setting up a DAC beyond the first 3 points. I found a drawing awhile back but cant seem to find it. It showed the correct order and each leg and bounces to complete the dac. I will be doing this for a 1" and 1.5" thick block for 45,60, and 70 deg angles. The skip distance will be around 6 inches. Thanks for any help!

 
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Paul H
,
USA, Joined Feb 2020, 3

Paul H

,
USA,
Joined Feb 2020
3
19:52 Feb-19-2020
Re: DAC with Basic Cal Block
In Reply to Paul H at 19:49 Feb-19-2020 (Opening).

.75" and 1.5" blocks sorry not 1"

 
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Paul H
,
USA, Joined Feb 2020, 3

Paul H

,
USA,
Joined Feb 2020
3
20:27 Feb-19-2020
Re: DAC with Basic Cal Block
In Reply to Paul H at 19:49 Feb-19-2020 (Opening).

Per ASME Sec V could i just pick 4 or 5 points that encompass the skip distance and calculate out the surface distance and be ok?

 
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Levi Porter
R & D,
Dacon Inspection Technologies, Thailand, Joined Jan 2017, 56

Levi Porter

R & D,
Dacon Inspection Technologies,
Thailand,
Joined Jan 2017
56
06:56 Feb-27-2020
Re: DAC with Basic Cal Block
In Reply to Paul H at 20:27 Feb-19-2020 .

zoom image

Trigonometric Info

Hi Paul,
I'll take a stab at helping you since nobody has replied.

Could you give a little more information with regard to your calibration blocks. 0.75" and 1.5" are standard sizes for ASME basic blocks. These usually have both side drilled holes and notches. If you are using Notches to create your TCG and performing inspection with 60 degree and 70 degree refraction in steel, you should remember that mode conversion occurs.

A dac curve is created by plotting the amplitude responses from equal size, shape, and oriented reflectors over different distances. You can plot as many points as wanted / needed as long as you continue to get discernible signals over greater distances.

I think you are trying to calculate the DAC sound path when calibrating on an ASME Basic block that is not the same thickness as your inspection piece. For that you can use simple geometry to calculate your inspection sound path, and use those values to ensure your DAC encompasses that sound path.

You can find the full set of trigonometry information here:

https://www.nde-ed.org/GeneralResources/Formula/AngleBeamFormula/AngleBeamTrig.htm
 
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