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 side drilled holes (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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