Відео

It's may be more better when you it shows mc and prob image into it

Thank you sir , finally i have one question if possible to detect 1.5 mm discontinuity in 5 mhz ,tr probe with valuable sensitivity.sir i understand the sensitivity session,but i need this question in your side . please reply this one sir😊

I have a doubt sir this is devarajan from Chennai india can we find out at x distance what's the curves amplitude is there any formula for it while using b2s

66db is required to bring indication echo to 80% of 600mm, whereas backwall echo required 14db to set 80% of 800mm. How it possible..Am in confusion..how 14db will taken to bring bwe to 80%

Hi, we need to use the DGS curves still if the UT instrument has inbuilt DGS curves. Secondly, if we set back wall echo to 80% the db will come at 60 to 70. How to corelate with the hardcopy of DGS to instrument DGS. In your presentation, how 14db is assumed to set BW echo to 80%.

I'm from Canada but I'm doing my Ultrasonic 2 in German, you might have just saved my bacon, thank you.

Thanks sir

You are a great persoanje

Very educative contents. Thanks

Very informative. Thanks for the detailed explanation. Much appreciated

I just subscribed. From Canada. Thanks

very good video. I have a question. What is the dead zone of the phased array transducers? thank you Dr. Vrana!

It’s very informative thank you

So you lectured about ultrasonic testing?

A great video.. Why can not we use audible frequency range of sound waves for industrial inspection?

Hello Dr. Vrana, could you do video/blog on nonlinear UT methods for early damage detection vs how they compare with the linear methods. I'm really new to NDE methods, and trying to do my masters thesis on identification & sizing of fatigue cracks. All the recent papers seems to favor nonlinear methods (e.g. frequency modulation, wave mixing, non-linear coefficient) for detecting early damage. I feel like, as someone like you who has been in this industry a long time can shed some light on the feasibility of these non-linear methods.

nice

Great Video! In most applications the scanning speed is very important. FMC/TFM is certainly much slower compared with "standard" PAUT. What is your view on this?

"Promo sm" 🙄

Can you explain how did you get the angles values on Shear case 3 and 4? I've recalculated it, based on snell's law using water(n1.5) and steel (n2.67) indexes on shear, the critical incident angle is 41.80degrees; pass that, TIR occurs(Total Internal Reflection). I wonder how in case 4, would you get 90 degrees with an incident angle of 56.5 degrees. I guarantee you, you wouldn't get any (r) refraction with an incident angle of 56.5 degrees based on this example. (r)Refraction line would completely bend away at those angles whether using rexolite or plexiglas given they have higher n values. Lots of techs in the industry missing proper shear calibration and end up being unable to pick up any defects.

No video on 5.0 actually talks about 5.0.

Bro if people knew how much money you can make off this job, you would have 1 million views

Thanks so much for making your video series, sir.

hi is it possible to obtain a pdf version (or any other e-version) of "The World of NDE 4.0"?

Is not it dangerous sometimes to evaluate FBH size purely on an amplitude based technique? Like DGS or DAC basically. The reflector may be "equivalent" to a disk shape, but it might be much bigger than it appears! Because the indication could be irregular, and would scatter the sound rather than a specular reflector. I know, yes... the amplitude based technique is a core assessment method but sometimes I doubt its reliability.

Thanks for sharing

Dear Mr.Vrana, many thanks for this lesson. There are a lot of variables that affect DGS correct sizing. This is one Iwas not aware of.

Just what I was looking for, at a convenient time 😁

one mistake in video that given second critical angle is longitudinal 90 degree inspite of shear wave 90 degree

Thanks for sharing those great news

Love your presentation style! Your excitement is contagious!

great video I'd like to have more details about that U-Net process, but still the video is great

Very insightful and a great overview of neural networks. The regulations and legislation around the use of AI in this regard are tricky though especially in highly regulated fields like aerospace, somewhat similar to problems with self driving cars. If the AI model fails to correctly identify a defect that ultimately leads to a failure who bears the responsibility? Or if it identifies a false positive that results in days of downtime and lost revenue. Is it the operator of the test set with AI implementation, the company that designed the AI model or was it the company that provided dubious training data? AI technology is currently advancing far faster than regulatory bodies can legislate for. We're certainly in for an interesting few years.

full of knowledge, thank you so much for the video 🎉

pls do not lower your voice at the end of sentence like you were whispering because i could not hear and and understand what you are talking about.

Bros 😊

Great video, but how can I measure the material specific attenuation due to damping (ACV) for transversal probes? For example, when we use a V1/K1 block radius for calibrating a 45°, the attenuation due to beam spread I can check in the diagram, but how do I measure the ACV in a given material? Can I just connect two angle beams and use through transmission and calculate damping based on the soundpath between single and double skip?

very good idear

Love your videos!! Im working on getting my ASNT Level III UT Certification, I just passed the Basic exam and found your videos looking up techniques for UT!!

I'm intrigued about why you describe as high frequency the A-scans from each capturing elements. I get that we're talking about ultrasonic waves, but shouldn't we reserve such description to frequencies above like 10MHz?

dang it i thought this was about near death experiences 😂

Excellence... pls come to south Africa

Today is a great day.

Good video❤️❤️

What do you think about email? What issues do you see? Is email a good or a bad system?

Thanks

Met this guy at the train. Amazing knowledge, amazing person! Keep up the good work 💪

Mi ídolo

THANK YOU SO MUCH! I had trouble understanding the whole side lobe thing in a book of mine. Like I was already thinking that at some angles there would be no energy transfer. Even with normal acoustics. I wish that books would integrate "in practice" more with the theoretics.

Great info 👍 thank you