How to perform a transfer correction

A transfer correction is used during ultrasonic weld examinations to correct for differences in attenuation due to surface condition and material variances between your calibration block and the test piece.
Flaw detector: Sonatest Veo+ 32:128
Probes: Olympus C541 transducers w/ ABSA 5T-60 wedges
Calibration block: PH Tool PAUT Block No. 3
Flaw specimen: Flawspec 5/8 inch butt welded plate

[@BGIS2000]

New NDT Technicians need people like you. Please keep up sharing your great knowledge with us. Thank you very much.

[@hollowayndtengineeringinc.5201]

You are welcome!

[@kmmining1359]

Nice Video, Very proffessional and easy to follow instructions. Might I suggest the following: Use the "reference" block with the side drilled holes which you used to construct your DAC curve since you are measuring the difference in dB between the test piece and that block. Secondly I think it better you take the TLC on the test piece in the direction of scanning and not perpendicular to it. Grains become elongated in the steel rolling process and there will almost certainly be a difference in dB between Tx and Lx scanning directions, especially when dealing with steels such as TMCP. By the way, that is one hell of a SEXY Flaw detector... the machine, not you :) Liked and subbed.

[@BM-ms3gr]

Never seen a more simple explanation ✌

[@pramodmyakal6875]

very good Paul, Simple and easy explanation

[@jeffersononetwo]

Another great video Paul!

[@MyCanucks2011]

Thank you very much for sharing this knowledge and for making it simple.

[@hollowayndtengineeringinc.5201]

Thank you for watching!

[@omarsami3593]

good job keep it up

[@soumyasarkar9556]

Excellent explanation. Simple & informative.

[@weendemgoncalvesdeoliveira]

Aqui no Brasil os procedimentos de inspeção nos obriga a fazer a perda por transferência no mesmo sentido e direção que será executada a varredura, ótima explicação.

[@LukaszSpigiel]

Thank you, an excellent explanation!

[@nazramwanmohd2017]

Thanks a lots Paul.

[@azzulove1]

Thank you so much and very good explanation.
Small doubt you made transfer correction on weld plate opposite direction to scan direction, its not big issue but rolling plates may have anisotropic nature, but here our intension is how to perform transfer correction

[@PhiHung451]

that's sound great. thanks so much

[@dinho9492]

Thanks for video🙏, From Borneo Sarawak

[@Big-mike07126]

Thank you Paul

[@ArunKumar-yo3yx]

Please make a video on DGS method and its practical importance in Longitudnal beam inspection and Shear Beam inspections

[@ellicomzzy2434]

Thanks Paul, your videos have been helpful. Pls I have a question on some other areas which I will appreciate your assistance.
Thanks paul

[@jackcharlie9319]

Does the transfer correction apply also to 0 degree compression thickness testing? Or isit only with an angled beam?

[@mohammedshahnawaz7077]

Nicely explained...

[@Zack_8413]

the correction is made in the same scanning direction on the plate here in Brazil

[@hoyinlaw3408]

Hello Paul, I would like to know the difference between transfer correction and range setting correction. May you please discuss it?

[@hollowayndtengineeringinc.5201]

I haven't heard of range correction. Sorry.

[@ahmadfayyadhzainalabidin405]

Hi Paul!
Can i ask you?
What method you used for perform a transfer correction.
I'm newbie in NDT please help me.
THANKS.

[@zacharymartin1876]

Just did my EMC/General UT2 written exams. Was blind sided by this and other questions as it was never mentioned in curriculum. Would happen to have any videos explaining rectangular probes? All in one?

[@hollowayndtengineeringinc.5201]

There isn't really much explanation required for rectangular probes, but all-in-one shear wave probes might be interesting to talk about. They are more common in Europe.

[@jason3623]

Is it all practical to do a Transfer correction on a curved reference block? Considering that the OD to ID (I) DAC point would be lower than the first OD to OD (V) DAC point. Or would you just use the (V) and (W) points?
Thanks for the great video.

[@hollowayndtengineeringinc.5201]

V and W

[@alalndt8041]

Transfer correction Dac but you never tell this rolling direction or transverse direction and how to know this rolling direction or transverse direction sir

[@jason3623]

Hi Paul.
Is there a particular reason you use round 5Mhz transducers instead of rectangular?
After watching this video are tried finding 5Mhz transducers but Iv only found round ones like the Olympus ones you are using.
One of the procedures I use insists on rectangular probes.

[@hollowayndtengineeringinc.5201]

Hi Jason, I bet the procedure you're referring to is AWS D1.1. That code requires rectangular because that's what was around 50 years ago when it was developed. I prefer round transducers because the quick change type (screw in) are typically smaller. I do have some really tiny square shear wave transducers but they're all one piece (crystal and wedge).

[@santiagocruz9060]

Hi paul this is the same transfer correction procedure use in api1104?

[@hollowayndtengineeringinc.5201]

Yes, but API uses it for determination of refracted angle as well as attenuation.

[@santiagocruz9060]

Thanks

[@reginaldogomes7123]

This correction should be checked in the same direction as the inspection ie 90 degrees from the weld.

[@hollowayndtengineeringinc.5201]

You bet

[@kiransetty5656]

Hello Sir, Can I use transfer correction to check the variation in attenuation of materials which are having different sound velocities?

[@hollowayndtengineeringinc.5201]

Not really, since the difference in velocities will produce different refracted angles.

[@kiransetty5656]

@@hollowayndtengineeringinc.5201 He'll sir, thanks for the quick reply. What if I am making transfer correction using a normal beam probe?

[@brodiebasterfield1923]

Good video

[@nolum8646]

I wish you can show the setting where you turn the machine to through mode

[@bacelismael8687]

thanks for the informative video :)
may I ask a question? two actually
1- do I need to calibrate for distance and velocity/delay before establishing a DAC curve? or it doesn't matter anyway?
2- if I want to inspect using a 5MHZ 70-degree probe, but my Cal Block doesn't have enough space to do so, can I use the same frequency 5MHZ but 45 degree probe? knowing that all my probes from the same manufacturer and same element size?

[@hollowayndtengineeringinc.5201]

1. Yes
2. No

[@bacelismael8687]

@@hollowayndtengineeringinc.5201 that was pretty fast o_o
thanks a lot! that was very very helpful

[@ndthero]

Can you use this transfer correction value on your PAUT instrument?

[@hollowayndtengineeringinc.5201]

Hi Eddie! Ya I think it would be no problems. Provided the frequency of the conventional pair you used for doing the xfer correction matches the PAUT probe(s) you're using for examination, it's all good.

[@geemarino6066]

The degree angle must be the same as the another probe angle also??

[@hollowayndtengineeringinc.5201]

Yes

[@geemarino6066]

@@hollowayndtengineeringinc.5201 Thankyou sir this is a nice video it helps a lot .... From philippines

[@farisirfan9947]

Hi sir Paul, if i do transfer correction by using Pulse Echo mode instead of Dual mode is it valid?

[@farisirfan9947]

Im using single crystal angle probe

[@hollowayndtengineeringinc.5201]

You would need identical reference reflectors in both, and identical thickness. Much easier to use two probes in pitch catch.

[@farisirfan9947]

Thank you sir! Btw, nice video and explanation 🙏

[@anartysonboxing7532]

👍

[@kiransetty5656]

Do I need to calibrate my equipment (for Velocity) in Pulse-echo mode or Dual/Through mode to make transfer correction? Thank you.

[@hollowayndtengineeringinc.5201]

Not really, no. Your pulser and filter settings should be the same as what you will use during examination, but the precise measurement of the arrival time is not important. Only the difference in amplitude between the reference block and the test piece is needed.