u/Icy_Consequence_1556

If immersion ultrasonic testing is calibrated using a 0.2 mm flat bottom hole reference, and the tested steel sample shows a reflection amplitude "echo " 50% ,does that mean the defect size is 0.1 mm?

I don't think the reflected amplitude percentage directly gives the defect size, because the defect could be a pore or non metallic inclusion, which would produce different reflection amplitude even if they have the same size. The orientation also influences the amplitude.

So, what reliable information does the reflection percentage actually provide??

If immersion ultrasonic testing is calibrated using a 0.2 mm flat bottom hole reference, and the tested steel sample shows a reflection amplitude "echo " 50% ,does that mean the defect size is 0.1 mm?

I don't think the reflected amplitude percentage directly gives the defect size, because the defect could be a pore or non metallic inclusion, which would produce different reflection amplitude even if they have the same size. The orientation also influences the amplitude.

So, what reliable information does the reflection percentage actually provide??

If immersion ultrasonic testing is calibrated using a 0.2 mm flat bottom hole reference, and the tested steel sample shows a reflection amplitude "echo " 50% ,does that mean the defect size is 0.1 mm?

I don't think the reflected amplitude percentage directly gives the defect size, because the defect could be a pore or non metallic inclusion, which would produce different reflection amplitude even if they have the same size. The orientation also influences the amplitude.

So, what reliable information does the reflection percentage actually provide??