#30 - It's all about where you put your probe : Ultrasonic metal thickness testing

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Welcome to the 16th of Season 2
It's all about where you put your probe.
This week we finally get to do a proper ultrasonic metal thickness test using the Olympus 38DL!
NDT or Non Destructive testing is a term which covers a number of methods of testing which do not cause damage to the thing which is being tested.
We have our own Ultrasonic Thickness Tester which is a Panametric DL25 but to use that we need to expose some metal and test by placing the probe directly in the exposed steel. The amazing thing about the DL38 is that it will read through paint and even through epoxy fairing to an extent.
But it only reads that exact spot so vital inspection of the steel is still a crucial part of the process.
We have now checked the entire hull, from a few inches above the waterline, right down to the underneath of the keel, and along the entire length of the hull using the DL38 and we're super happy.
We know the areas we need to focus on and having done this we are confident there are unlikely to be any major nasty surprises down the line.
We're still going to wet blast the entire hull from the waterline down later in the spring, but for that we need a few days good weather so we can treat and paint the metal straight away.
We're doing the major welding jobs first so the new and old steel will all get blasted to the same texture and "key" making for better paint coating adhesion globally.
We are Andy, Melissa and Jack, a sailing family based in North Wales, and for the past couple of years we have been looking for a bluewater sailing yacht to take us around the world.
Well we've finally found her. Our new sailing yacht is a John Teal designed 38ft Steel Pilothouse Cutter. She has been standing ashore for at least 15 years and now we're embarking on the huge challenge of refitting her and doing her up ready to go sailing around the world.
Follow along with our journey and help us with any advice and tips you have along the way.
Our equipment
Sony Alpha a6400 Mirrorless DSLR
FeiyuTech a1000 3-Axis Gimbal Stabilizer
GoPro Hero 7
GoPro Hero 3
Iphone 8s Plus
Samsung S20
DJI Mavic Air
Our links
Support is on Patreon : / sailingmelody
Check us out on Instagram : / sailingmelody
Come talk to us on facebook : / melodysailing
If you would like to make a regular contribution to help towards getting us started on our adventure you can use this link to go to Patreon
/ sailingmelody
or make a one time contribution via PayPal using this link
paypal.me/sailingmelody
We would like to say a massive thank you for all your support so far!!
KO-FI is a website where you can support us buy buying us a "coffee" which would really help us out.
We would love if if you bought us a coffee or Jack and ice cream, click the link below :)
ko-fi.com/sail...
We also have a wish;ist now on Amazon if you'd like to help us out that way......
www.amazon.co....
Other links to our contributors and friends
Great Dane 28 Website
gd28.wikidot.com
This is the official website for the Great Dane 28 owners. Here you can find the history of the GD28 and a full list of all the owners.
Dudley Dix
www.dixdesign.com
Legendary yacht designer Dudley Dix! Dudley is world famous for some of the best racing and cruising yachts ever seen.
Mylor Yacht Club
myloryachtclub...
Lovely people and a stunning place to have a mooring, or just a stop over. Mylor yacht club are very friendly and have all the resources and help you could wish for.
Lincoln Electric - Quite simply the best welding equipment money can buy. And if that wasn't enough, a super lovely and helpful company!
www.lincolnele...

Опубликовано:

18 сен 2024

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Комментарии : 116

@yellowstonenaturerc8518 3 года назад

Your restoration videos are amazing. What strikes me as most important, and educational, is that your videos, unlike some others, are truly a "Family" project. Each member of your family share in the restoration, and that you always show Jack as an important part of the ongoing adventure. To 'Jack' I say 'high five kid' you are awesome! I can only imagine how proud your parents are of you. ... Your friend in Cody, Wyoming

@SailingMelody 3 года назад

Thank you so much for your lovely kind words. Jack is a massively important part of the team :)

@lydiaajohnson 3 года назад

19:10: Boy and dog walking along. Beautiful. Glad you got that on video. You will absolutely cherish that 20 years from now. My little boy is grown now. Happy-sad. Actually, that whole video of the family together on a walk is superb.

@SailingMelody 3 года назад

Thanks Lydia! Always lovely lovely comments from one of our star supporters

@langbangnz 3 года назад

Probably the most positive and optimistic person I have ever seen, wish I was more like that! Good on you guys 👍

@MrELOIGOMES 3 года назад

I liked the video, but I missed Captain Jack's always pleasant participation in this episode. Surely he'll be back more often soon, won't he? Go ahead and all the happiness in the world for the three of you!

@SailingMelody 3 года назад

Yes he loves to be involved and we love involving him but don’t want to pressure him to do to much

@MrELOIGOMES 3 года назад

@@SailingMelody Perfect! 👊🏼

@PMMM9 3 года назад

I’m so happy for you all. Having the reassurance of the ultrasound renews your confidence and confirms your intuition regarding your gem in the rough. As the weather improves, and the days hold more light, your enjoyment will allow tasks to tumble. Please make time for outings and walks together; Such a lovely family.

@keithfletcher5788 3 года назад

Money well spent for a peace of mind.Stay safe.Best regards.

@SailingMelody 3 года назад

Absolutely!!!

@maryjnorwood3962 3 года назад

Truly loved the ending with the amazing scenery that surrounds you. Really enjoying your channel. Thank you!💕

@SailingMelody 3 года назад

Thank you that’s really lovely

@clairepapadatos1116 3 года назад

Absolutely brilliant, if not painstaking, work! So glad that the old girl hadn't any hidden nasty surprises! 👍 Beautiful footage at the end! Where are you? All love, and best wishes, Claire, Sally the older Goldie, and Lucy the cat, Berlin 😘 😘 😘 ✌ 👍

@SailingMelody 3 года назад

We are in North Wales in the Uk We live on the Llyn Peninsula near a village called Porth Dinllaen and the boat is a few miles up the road in Holyhead

@clairepapadatos1116 3 года назад

It looks absolutely gorgeous! Made me feel terribly homesick😢 One day.....! 😙😙😙

@paulscott6463 3 года назад

Good job you done there, and pretty much explained everything txt book good job. I forgot to tell you the biggest trade secret to UT inspection, a wall paper scraper, quick little tickle of the area before putting your gel on...lol, looks good, well done

@SailingMelody 3 года назад

Thanks for your help and advice Paul! Really invaluable and glad to know we went about it more or less the right way

@jimmac521 3 года назад

that's a nice bit of film work there at the end... well done.

@SailingMelody 3 года назад

Thank you 😊

@bobuncle8704 3 года назад

That sure is a handy piece of kit. It’s really nice that you knew someone who had one that you could borrow. There are some cheap ones available, but it’s too important to use a cheap tool on a job like this.

@SailingMelody 3 года назад

Absolutely. Even the cheap ones are great though so long as you can expose the bare steel and read that

@Mylifelovingit 3 года назад

Doing a repetitive job like that is not always fun but the peace of mind afterwards makes it all worth it

@SailingMelody 3 года назад

Yes it gets a bit tedious after a while that’s for sure

@angeloys 3 года назад

Great news. Must be really reassuring to know now. Keep safe and can’t wait for next episode.

@TheDobby11 3 года назад

Family project. Family time. You cannot put a price on it. Well done and keep up the good work. Dave in Canberra Australia.

@jimmcdonald9244 2 года назад

Splendid job Andy & Melissa, and of course Jack. I live in New South Wales, Australia. I've always wanted to know what the south Wales coast looks like. Thank you for the views.

@SailingMelody 2 года назад

We are on the north coast of Wales but I'm sure the south of Wales will be in an episode once we are in the water 😁😁

@johnbrown9438 3 года назад

well done, guys great video again,love the little ship,very good find,roll on spring,missing wales keep up the good work,thank you.

@cornelisvanderbent2092 3 года назад

You guys brighten my day every time.

@SailingMelody 3 года назад

Thank you so so much! And welcome Aboard ;)

@almath9987 3 года назад

Thanks, this will give you peace of mind👍🏻 To carry on the theme of the video title... guy in work went to site with a ultrasonic clamp on flow meter to do a test. When he started setting up he released the last person to use the meter had used all the coupling gel! After a 2 hour drive he wasn't going to give up so went do to the nearest supermarket and bought some KY jelly. Worked a treat and he got the job done however when he handed in his expenses the woman in accounts questioned him on his receipt for KY jelly so he had to explaine 😂 Gave us all a good laugh and he still get the odd dig about it😅👍🏻🏴󠁧󠁢󠁳󠁣󠁴󠁿⛵

@SailingMelody 3 года назад

Hahaha that’s so funny!

@brianbevington8777 3 года назад

that is very good news,..no surprises later on !!

@SVImpavidus 3 года назад

Exactly as you expected! Sail Safe Guys, Ant, Cid & the pooch crew.

@SailingMelody 3 года назад

Yes we are happy with that. Hope your all good 👍

@ascot1049 3 года назад

Brilliant .

@JP-lz3vk 3 года назад

Real "edge of ruler" excitement this week...

@SailingMelody 3 года назад

😂

@Kathleensailorgirl 3 года назад

Looks like good news, definitely nice reassurance using the ultrasound. Stay safe ⛵️⛵️💕

@lancedaniels 3 года назад

Really good news from using the ultrasound. Nice to see a little more of the area around the marina.

@SailingMelody 3 года назад

Yeah we were very happy

@paulbiezing2686 3 года назад

Pretty sure many of us watchers are happy with the readings as it looked rough

@SailingMelody 3 года назад

Yes we’re getting so much positivity from you guys it’s lovely. But I agree she looks tougher than she is. There’s a long way to go yet snd lots of steel to cut out

@trevhedges 3 года назад

Very cool! No Surprises..

@SailingMelody 3 года назад

Indeed indeed! And hi there Trev! Must call you for a chat sometime soon

@gutsanglory1 3 года назад

Piece of mind.. that's the big thing. Nice to hear there was no crazy issues pop up. Cant wait to see your crazy welding skills! Do you have a lot of experience? Please be sure to include some details on steel qualities and types, and welding technics. I've done lots of welding in my past and know there's a tone of good subject matter on that topic. Nice to see the weather start to turn around :) Cheers all !!

@bgt7874 3 года назад

Good to see you know where you stand now knowing you have a solid base and can start renovating. Are you going to probe the steel of the deck/topsides as well and are you going to make a plan of when and how you are going to work on the different jobs/projects? Greets, Bas

@SailingMelody 3 года назад

Yes its a lot more comforting, no we are quite happy with the decks, but we do have our own thickness tester that doesn't read through paint that we can use if we see anything concerning! Yes we will probably do an update plan episode soon 😀

@keithmabey4705 3 года назад

Interesting! No doubt you are pleased, that the measurements support your original thoughts.

@SailingMelody 3 года назад

We certainly were! Still using our eyes to scrupulously examine every inch of the hull inside and out though as you’ll see in the next episode

@miru71 3 года назад

Someone wrote about welding a patch onto an existing sheet. This cannot be done. This is against yacht building regulations. One sheet may only overlap the other a little. There is a suitable formula for this. L = 1,5g + 1,5 [mm] L-overlap width of two plates g = thickness of the repair sheet. In the fall, I removed the mooring poles from the deck, which were welded to the sheet. There was a lot of rust underneath. You said you want to sandblast everything after welding - and you do! But ... if you can rent a sandblaster for a day, sand the spots you will weld. Only then repair the plating and sand the entire hull at the end. There is one drawback to cleaning the repair site with an angle grinder. When grinding, the tiny spots of rust can be covered with healthy metal. Yes - steel is malleable. :-)

@SailingMelody 3 года назад

Yes absolutely! And don’t worry we won’t be overplating anything! The idea makes my skin crawl! I used to fix up cars and back in the 80’s there was a fashion for welding floor pans and sills into car bodies by overplating the panels and it used to drive me crazy the number of times I’d cut out a rotten floor pan in someone’s car to find the remnants of the previous floor pan underneath it....... and they wondered why the new one only lasted a couple of years before that rotted through 🤦‍♂️ We can’t rent a sandblasted as all sandblasting work in this yard has to be done by the yard not by ourselves or anyone else but hey Ho, their yard their rules

@harrisonandrew 3 года назад

The title made me laugh. One always have to be careful where one puts ones probe. You certainly don’t want to damage it or substrate. I applaud your care.

@spankmeairlines 3 года назад

Nice probe humor in the title ... ha ha 😉😆! Great news and only one surprise (keel box).

@allanwood3562 2 года назад

Oh boy the countless hours ultrasound I have done as part of my work. As a rough rule of thumb I gridded out at 100mm squares on the kind of surface you have. There's a lot of technique involved but for what it's worth using vet lubricant or, ahem, personal lubricant works well as a cheap couplant as are China graph pencils for marking up (or paint pens). Also as a rough idea 1mm of steel makes approx 10mm of rust.

@chaosandcarnage1 3 года назад

Don’t forget that something as simple as the paint thickness can give a small change in the reading. Glad to see it’s not so bad after all. Lol

@SailingMelody 3 года назад

That machine tells us the overall thickness, the steel thickness and the paint thickness separately, it’s a very fancy expensive machine

@mattthedog5738 3 года назад

Well done guys. Always enjoy your channel content. Can’t wait for the hair cut 😉

@SailingMelody 3 года назад

😂

@tejolisboa 3 года назад

This is smart working!

@russcollins4306 3 года назад

Do you know the age of the Stone harbour wall ? Great news about the small percentage of steel in the Hull to be repaired. Thanks for sharing !!!

@justinfufun5483 3 года назад

Riveting stuff. At least not boring to find out the depth and condition of your hull must be. Sweet to find out the sugar scoop is lightweight. Enough puns for one episode. I would have gone the hole hog (sorry) and used my knuckle to tap my way along the hull and go " ah sure its grand. Delighted for you. Bet you had a great night's sleep after that one.

@SailingMelody 3 года назад

😂 We certainly felt alot happier

@lydiaajohnson 3 года назад

Fantastic news about the hull thickness. I doubt the steel is as thick as the readings on the blue boot strap line. Wonder why the blue paint consistently shows higher readings.

@andrebelanger7798 3 года назад

Very interesting your video Andy, When you walked with your family you passed near a fortress. What year is she from. She doesn't look very young

@delukxy 3 года назад

The rusty steel boat moored up in the harbour could be your non identical twin! Does look rather similar. Been there a while by the look of it too. Top work with the ultrasound. You could have just added a dab to the probe perhaps rather than the hull?

@SailingMelody 3 года назад

We tried various methods lol. And yes we were offered and considered the big steel floating yacht but it’s 60ft and would have crippled us physically and financially I think

@jfarmer1711 3 года назад

The lost of 0.1mm along the chimes is probably from where they were ground fair during construction.

@SailingMelody 3 года назад

Yeah! In the majority of places it hasn't lost anything so we are happy with that 😁

@motorboatselmaiii109 3 года назад

While it's fine to measure the general thickness of the hull all around as you have done, it doesn't really give you the real image of the hidden flaws of the hull. The danger lies in the small corroded spots, and the way to measure them is to grind them with an angle grinder until you reach the bottom of all the small pits of rust, and then measure the thickness. That will tell you the real thickness. You also have to inspect the inside of the hull in order to find the spots where it has rusted from the inside, and then measure from the outside in those places. I used to do this kind of work when I was young, so I know what I'm talking about.

@SailingMelody 3 года назад

Totally agree hence the name of the video, we also say that only tells us the areas where have measured. We are exposing and inspecting the internal steel. We also have our own thickness tester which doesn't read through paint so if there are areas that are concerning we can take of the paint and test 😁

@fireantsarestrange 3 года назад

I would agree.. but id still just hit it with a stick. haha

@motorboatselmaiii109 3 года назад

@@SailingMelody It's nice to have a thickness tester at hand, it makes it a lot easier to do it right :-) After all, the real thickness is the thickness at the bottom of the deepest pit - I have seen small rust spots on 8 mm steel plate where the thickness in the deepest rust pit was only 1 mm. But as long as you can access it from the inside, it's no big deal to replace a few pieces of steel plate in a boat like yours. I don't know how much experience you have in working with steel hulls, but if you don't already know it, here is a couple of safety ground rules: It's important to make the corners round (>= r30) when you cut holes in the middle of a steel plate. This is to avoid cracks forming from the sharp corners. Sharp corners can be used when the cut starts from a seam. It will be a fine boat when you are done with it :-)

@MrMarv75 3 года назад

Who is the 🔔 end that's pressed dislike on this vid ? 👊

@Cortez-rx7vj 3 года назад

I agree. There must be people who go through life pressing the dislike button on everything for this video to get a thumbs down. I'm looking for a boat myself and had always discounted steel over fiberglass as an option but this channel is definitely changing my perspective.....

@JP-lz3vk 3 года назад

@@Cortez-rx7vj This has confirmed my suspicion about steel - yes it will protect you from rogue vessels crashing into you but Melody will struggle to go upwind under sail.

@dalewatson7982 3 года назад

@@JP-lz3vk yes it will, I had a steel 45ft ketch closest I could get was 45deg, had to motor sail most of the time. Still loved it though. Good luck.

@JP-lz3vk 3 года назад

@@dalewatson7982 I have to think "what is the point of having sails?" if you have to use the motor most of the time and fuel is expensive...

@dalewatson7982 3 года назад

@@JP-lz3vk Jusy To move our boat we required around 10 nots of wind,didn't fancy that,so just a tick over of the donk gave us a couple more nots. You get used to the engine noise. Never bothered us.

@jimalexander1896 3 года назад

How thick is 4mm?...in inches?.....or gage?....I am am a welder but never done a lot of sheet steel!...sounds like your on the right track! Cheers

@SailingMelody 3 года назад

It’s 5/32”

@nilslundqvist34 3 года назад

Amazing as always! But can you estimate when you will be able to launch the boat?

@anthonybeck2384 3 года назад

👍👏🏻👍👏🏻

@sheilamrum8132 3 года назад

ITS gonna be a Beautiful boat 🙂🙂🙂🙂😎😎😎😎😍😍😍😍

@MrToyorick 3 года назад

Are you in contact with the guys with the channel # Ship Happens ? the are looking for a ship yard for their big wooden boat 😁 i think you are in the same region....

@SailingMelody 3 года назад

We are yes. Holyhead is a bit too far for them I think

@seawolfburak Год назад

Could you please advise your device name model and do you think that it can be used for aluminum hull? Thanks in advance!

@howardbeer5214 3 года назад

Just make sure you use blasted-primed sheet plate marine grade to weld in or if you use just plain steel plate it will corrode like hell from the inside out just as that has YOU MUST USE BLASTED PRIMED PLATE !!!

@SailingMelody 3 года назад

Sadly we can’t get it round here. But I’ve got an excellent, friendly and well informed steel supplier who is being super informative and helpful

@howardbeer5214 3 года назад

@@SailingMelody Try and find a good steel supplier and am sure they will be able to get it for you Blasted and primed with low burn epoxy

@bryonensminger7462 3 года назад

Depending on the ink it could very easily bleed through the paint

@SailingMelody 3 года назад

Good point I’ll be sanding it off though. I’ll be sanding right through the top coat back to the original primer

@pagegreer5081 3 года назад

Do know your sheet steel thickness at build time. Pad welding we be in your future.

@SailingMelody 3 года назад

The hull is built in 4mm and the decks 3mm, inside the keel box is 6mm

@paloureiro 3 года назад

Perhaps, I'd use more ultrasound gel. Maybe it's the reason for the disparate readings

@SailingMelody 3 года назад

Quite possibly, it reads through paint but I think the fairing in places is too thick to read through.

@paloureiro 3 года назад

Does it have an image or only a numerical reading?

@SailingMelody 3 года назад

The one we were using in this video shows both and it shows the paint thickness too.

@paloureiro 3 года назад

When there is air between the probe and the material you are scanning, the images will be defficult to obtain. If the image was good, you can double check the displayed thickness value. Maybe where there is epoxy there are trapped air bubbles that prevent the US penetration.

@SailingMelody 3 года назад

Thanks for that we will do some more tests, we have it for another week 😀

@si_vis_amari_ama 2 года назад

@15:24. It appears you've lost a stringer through the hole ;-)

@pagegreer5081 3 года назад

So when its blasted are going to do 1 side at a time. Then prime and refare. Or all at one then try to get it done?

@SailingMelody 3 года назад

We will probably have to do it all at once. 😅

@John-ps7mk 3 года назад

no bad news is great news. the steel hull will keep you safe in case (I hope not) run into a floating cargo container.

@JonMadsen70 2 года назад

@fireantsarestrange 3 года назад

Lol... i'd just knock on it with a stick and listen for it. There is a lot to be said for good old senses. I can tell if that 1/4" steel is gone.

@SailingMelody 3 года назад

Eyes and ears and touch are often the best tools we have. As a paramedic I have a saying “Look at the patient not the monitor” it’s easy to get distracted by a reading on a machine which says something which is in opposition to how the patient actually looks. I can a lot from initial visual observations of the patients position, muscle tone, skin colour and then a quick check of the patients wrist will tell me about their heart rate and skin temperature and watching them speak to me will tell me about their respiratory rate, rhythm, volume and effort before I’ve attached a single piece of equipment to measure anything. So I have a pretty good idea of what numbers I’m expecting from the monitor equipment and that means I don’t tend to panic when I see a weird looking set of numbers.

@jakeoddmonic2956 3 года назад

Heheheheheheh

@harveypost7799 3 года назад

Huh?

@SailingMelody 3 года назад

@fireantsarestrange 3 года назад

You can just see it man. It's not that hard... I would be looking more or less on the inside because that is where the problem is. The bilge is probably the worst of it.