Production of a tuning sample for ultrasonic testing from a test object

The use of a HO tuning block made from a fragment of OK  in the state of its delivery from the manufacturer “as is” – without its additional harmful purpose of controlling grinding “to a shine”.

The best solution to the issue of the correct setting of the flaw detector is the manufacture of the DO from the OC fragment in the state of its delivery.

As a rule, the OC manufacturer provides the most homogeneous conditions for the OC manufacturing technology, and the deviations associated with the possible difference in the OC in a homogeneous batch of the same OC, it must be assumed, are much smaller than those associated with the use of OIs from standard groups steels prescribed by the ND for the manufacture of NO, but, nevertheless, with a greater probability of not providing the identity of the acoustic properties required by the ND: the speed of sound, wave impedance – acoustic impedance, attenuation coefficients – absorption and scattering.

An error occurred in the adjustment of SPL according to BUT with non-identical acoustic properties with those of OK

with an ultrasonic testing verdict, OK as “fit for service” can become an irreparable mistake if it fails.