This is a great (sci-fi)-ish topic to start 2024 with ;). Thank you Paul for your efforts and interesting videos, very informative and creative. If you can check on your future list of videos, wouldn't you think about transfer correction for PAUT especially when dealing with SDH reflectors, as this topic is rarely talked about in Codes and standards. Thanks, and happy new year!
Currently in my country we just cut a small sector of the pipe enough for the probe and the beam spread; drill a hole so that the depth is correct in the middle of the block and pretend concave/ convex effect does not exist. It've been generally accepted by many many parties, so I guess that'll work until we find a better solution as making a curved hole can be really challenging.
ASME V also ask for 38 mm length SDH, for pipes 19 mm thick and below, only one SHD at ½ T would be enough. But if you have 73 mm OD pipe 5.3 mm thick (2 ½ pipe STD) it is not possible to drill a straight 38 mm length SDH (at any depth)! Let me know if I’m wrong! So, in those cases, curved SDH EDM would be mandatory?
You're not wrong about the length of the holes. This is why on the ERVT blocks, we have to stop at around a 3" XXS. Anything smaller or thinner and that hole gets too short. But to your second point, no. The point of the video was to demonstrate that sensitivity on a curved hole will probably be less than that of a straight hole. For thin stuff and small diameter, at this point we must use notches.
You could do a proper full-on curved hole pretty easily with 3d printing, even with a cheap printer using some of the modern metal 3d printing filiments that you print at home and send off for sintering (BASF makes a few options you can print on a regular printer). Aerospace and the chemical industry are starting to really embrace these non-machinable geometries for things like rocket parts and reactors, it might see practical use yet.
I'm not sure FDM would be able to produce homogeneous materials with low enough attenuation for UT. I have a small metal printed part, I'll try it out.
@@hollowayndtengineeringinc.5201 Ah, makes sense. I guess one other option would be a powder pressed part and then sintered. I haven't tried anything metal yet in my lab CIP but have been pressing ceramics at 60K PSI and sintering. Dimensional tolerance in cold isostatic pressing isn't great though. It is a super interesting thought experiment at minimum.
This is a great (sci-fi)-ish topic to start 2024 with ;).
Thank you Paul for your efforts and interesting videos, very informative and creative.
If you can check on your future list of videos, wouldn't you think about transfer correction for PAUT especially when dealing with SDH reflectors, as this topic is rarely talked about in Codes and standards.
Thanks, and happy new year!
Currently in my country we just cut a small sector of the pipe enough for the probe and the beam spread; drill a hole so that the depth is correct in the middle of the block and pretend concave/ convex effect does not exist. It've been generally accepted by many many parties, so I guess that'll work until we find a better solution as making a curved hole can be really challenging.
Great, clear, thanks Paul.
How about using AVG as per BS ISO EN 17640 technique 2
Any plans to make some TOFD videos
Very informative
ASME V also ask for 38 mm length SDH, for pipes 19 mm thick and below, only one SHD at ½ T would be enough. But if you have 73 mm OD pipe 5.3 mm thick (2 ½ pipe STD) it is not possible to drill a straight 38 mm length SDH (at any depth)! Let me know if I’m wrong! So, in those cases, curved SDH EDM would be mandatory?
You're not wrong about the length of the holes. This is why on the ERVT blocks, we have to stop at around a 3" XXS. Anything smaller or thinner and that hole gets too short.
But to your second point, no. The point of the video was to demonstrate that sensitivity on a curved hole will probably be less than that of a straight hole. For thin stuff and small diameter, at this point we must use notches.
THANK YOU @@hollowayndtengineeringinc.5201
It was very interesting.
You could do a proper full-on curved hole pretty easily with 3d printing, even with a cheap printer using some of the modern metal 3d printing filiments that you print at home and send off for sintering (BASF makes a few options you can print on a regular printer).
Aerospace and the chemical industry are starting to really embrace these non-machinable geometries for things like rocket parts and reactors, it might see practical use yet.
I'm not sure FDM would be able to produce homogeneous materials with low enough attenuation for UT. I have a small metal printed part, I'll try it out.
@@hollowayndtengineeringinc.5201
Ah, makes sense. I guess one other option would be a powder pressed part and then sintered. I haven't tried anything metal yet in my lab CIP but have been pressing ceramics at 60K PSI and sintering. Dimensional tolerance in cold isostatic pressing isn't great though.
It is a super interesting thought experiment at minimum.
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