Your better than my teacher. Please post more information on sizing, id creep, different cal methods and the purpose. Great info & thank you so much for positing.
Sir, A typically tough scenario. How to detect IGSCC cracks. Is it best by pulse echo or by Phased array of TOFD or tandem technique. What shape and amplitude to expect. In one experience: the weld some 20mm thick leaks But UT Signal observed only say 20% DAC when using standard 10% notch to set the reference level
Mahesh Jadhav for all of the IGSCC samples I have seen have been mapped with TOFD. So it is probably safe to say that is the best to size it. But I like your question about detecting IGSCC. It makes sense that it is not going to have a high amplitude vs. the notch because you set the notch to 80% FSH. But the notch is going to have a lot more sound returning because the corner trap. To increase amplitude from the tight cracking, calibrating on nodes (SDH’s), which won’t reflect as much sound, should increase apparent amplitudes of the IGSCC.
It can depend on the type of crack, but in general the signal from slag looks more like a Christmas tree with a a wider signal with fuzzy edges. Also by plotting an indication, the location of an indication can help you determine if a signal is slag or a crack. Fatigue cracks have a very clean signal. Hopefully, this is of some help.
Tip diffraction explained in a very clear and detailed manner, very easy to understand. Thanks a lot for the wonderful video.
Your better than my teacher. Please post more information on sizing, id creep, different cal methods and the purpose.
Great info & thank you so much for positing.
A hell of a lot better at explaining this than my teacher. I understand whats going on now. Thank you.
That’s great! I’m glad that you found the video helpful!
Thanks a lot for a very informative video clip... it is very helpfull.
I’m glad that you liked the video.
please,
can you use a sheer wave for UT on a pipe ?
Ay right on hoss. Nice video. Just the tip.
Sir,
A typically tough scenario.
How to detect IGSCC cracks.
Is it best by pulse echo or by Phased array of TOFD or tandem technique.
What shape and amplitude to expect.
In one experience: the weld some 20mm thick leaks
But UT Signal observed only say 20% DAC when using standard 10% notch to set the reference level
Mahesh Jadhav for all of the IGSCC samples I have seen have been mapped with TOFD. So it is probably safe to say that is the best to size it. But I like your question about detecting IGSCC. It makes sense that it is not going to have a high amplitude vs. the notch because you set the notch to 80% FSH. But the notch is going to have a lot more sound returning because the corner trap. To increase amplitude from the tight cracking, calibrating on nodes (SDH’s), which won’t reflect as much sound, should increase apparent amplitudes of the IGSCC.
SIR ,
ECHO SHAPE DIFFERENT BETWEEN CRACK AND SLAG?
It can depend on the type of crack, but in general the signal from slag looks more like a Christmas tree with a a wider signal with fuzzy edges. Also by plotting an indication, the location of an indication can help you determine if a signal is slag or a crack. Fatigue cracks have a very clean signal. Hopefully, this is of some help.
sir, sir sir sir, sir.