It's hard to pick a nice title for a video where all you do pick on 6dB drop for 5 minutes straight. That's the best I could come up with.
Пікірлер: 30
@coryharrison96592 жыл бұрын
Paul your videos are an invaluable resource for many techs who don’t have access to continued education. Thanks for all you are doing to spread quality technique and general flaw detection information.
@aerialrescuesolutions3277 Жыл бұрын
How does a tech not have access to continuing education? There are numerous opportunities to learn more about UT.
@coryharrison9659 Жыл бұрын
@@aerialrescuesolutions3277 is that a serious question? You can’t imagine a single scenario in which quality online resources like this one are valuable to a tech in the field?
@bacelismael86872 жыл бұрын
Thanks so much for your great videos as always, I love your easy to digest, and easy to understand content, I really admire your continuous efforts for developing and teaching UT/PAUT techniques 🙏🏻. best of luck! And by the way, Nice T-shirt you've got here, VEO3 is surely awesome 😉.
@levibrown66811 ай бұрын
Awesomeness,cant believe i was not aware of your KZbin channel,so happy i stumbled upon this. You are like the Master Roshi of ultrasonics. Love it
@courtneykadel949211 ай бұрын
Thankyou, your videos are a great help to better understanding ultrasonics!
@geemarino60662 жыл бұрын
Thankyou for the nice video sir. Paul :)
@jb512137 Жыл бұрын
Here I thought I was the only one who noticed this. Great explanation - this should not be considered the gospel it often is in the industry.
@Delrio2022 жыл бұрын
The disregard level is basically too small to be rejectable; very practical.
@anushm3405 Жыл бұрын
Really informative, Thanks
@anthonywilliams9508 Жыл бұрын
Paul if you would in PAUT please do a video explaining when to do multiple index scans and why. I would like to hear a better explanation as to at what thickness do we go to multiple index scans.
@hollowayndtengineeringinc.5201 Жыл бұрын
I'll add it to the list!
@alswanny2 жыл бұрын
It's a 6db drop that's been around forever its not a must use, but yes great video great information.
@pascaldainelli77632 жыл бұрын
Hello Paul, Thanks for sharing knowledge and ideas ! In your presentation do you assume that the real flaw length is > to the sound beam width (let's say -6dB sound beam width) ? What's your advice regarding small flaw length sizing of heavy thick parts (forgings, or weld between two forgings) with sound path of a few hundred mm with "standard" probes for this kind of components (B4S / B2S, WB45-2 ...) ?
@robertrobinson14542 жыл бұрын
In theory, the areas beyond the -6dB points would have already been scanned prior to getting to the max amplitude. Wouldn't that area be accounted for prior to scanning the rejectable indications? EX: So if you're scanning the weld and the max signal is say 90%FSH and you do a -6dB technique and you scan either side until you get 45%FSH. When you go beyond that, wouldn't you have already scanned the area where the amplitude picks back up? I guess what I'm getting at is the -6dB drop is assuming that the rest of the weld is clean and/or there's some other part of the code that covers how much distance has to be between indications to consider them separate or it would be lumped up already with the rejecteable indication. Making the -6dB technique legit. I'm not saying I'm not, I'm throwing something out there and hoping to get clarification. Thank you in advance.
@geemarino60662 жыл бұрын
If your evaluation is lack of fusion what technique would i be using? Coz you said earlier LF is a bit tricky Thankyou for the answer Sir
@Harry001989 Жыл бұрын
Real flaw length yes, but if acceptance criteria are based on amplitude and length then even if you leave some flaws still it will be acceptable.
@ehsanmohebbi2998 Жыл бұрын
nice, thank you
@dinho9492 Жыл бұрын
Thanks
@SantoshKumar-ru7xd2 жыл бұрын
What about height sizing? Can u please make a video about it.
@hollowayndtengineeringinc.52012 жыл бұрын
6dB for height sizing is useless
@hollowayndtengineeringinc.52012 жыл бұрын
www.ndt.net/forum/thread.php?msgID=80965#80965
@Xarius012 жыл бұрын
Wouldn't the max amplitute method over estimate the length?
@hollowayndtengineeringinc.52012 жыл бұрын
No it shouldn't. If there is a small spike on the indication you are picking up and peaking, that belongs to the flaw, and it's the last one, then you should be right at the end of it.
@robertrobinson14542 жыл бұрын
If I get a rejectable signal, I'm going to do the 6dB drop. At that point, I'm going to follow it until there's no signal left. Regardless of amplitude. Is that ok?
@hollowayndtengineeringinc.52012 жыл бұрын
Depends how long it is. If you have a 10ft weld with a trail of slag the whole length, and it peaks in the middle at 4dB over your acceptance level, but the rest of it is 2dB under, are you going to still call the whole thing? Probably not. You call what fails the acceptance criteria, so you use fixed amp technique.