Re: [MW:16543] UT- DAC curve preparation.

dear Sandeep

I will give solution.

I request you tell  me the follows

what  is joint configuration.?

it is flash ground or not ?

which prob you using?

what is DAC block length? 

that joint can access both side or not?

what is the actual thinness of Pipe joint?

On Fri, Jan 18, 2013 at 3:44 PM, soundrarajan indirajith <indirajith77@gmail.com> wrote:

hi

  in my experience i do 50 to 100 thickness  in plate 50mm  plate both
side scanning.but in pipe if u possible u take both side scanning in
50 mm .otherwise u do 100 mm thickness u draw dac for 100mm full skip
and scan bothside

thanks

indirajith

On 1/18/13, sandeep monody <smv.monody@gmail.com> wrote:
>
>
> Dear Experts,
>
> We are doing UT in 50 to 100mm thick circumferential joints of pipes using
> 75mm thick Non piping DAC block (The same has been accepted by client). UT
> operator is preparing DAC curves (for angle probes) catching echoes

> directly from *s*ide *d*rilled *h*oles (¼ t and ½ t) and catching ¾ t SDH

> echo after bouncing from opposite side.
>
> Our scanning area on weld joint is ½ to 1 ½ skip for 100mm thick weld joint
>
> but the DAC curve which is prepared as mentioned above, does not cover most
>
> of the scanning and I feel that most of echoes from discontinuity is
> missing due to the same problem.
> Please advise me to resolve this confusion
>
> Sandeep
>
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