Explosion Welding | How hard can it be?

Our first try on explosion welding! We try to weld copper to steel by using C4, will it work at all? Don't try this at home!

[@loddude5706]

'Mysterious copper plated seagull crashes onto parked Volvo in Finland, authorities remain baffled.'

[@stefanmeier6763]

:D

[@allangibson8494]

Mysterious copper plated seagull crashes into parked Volvo in Sweden authorities think it came from Finland...

[@loddude5706]

2.0 metre, 135kg. Finnish army clay-pigeon flinger & discus champion, awarded extended Copper Gull status for 'actions above & beyond her armpit'.

[@danielstuber8972]

instant bronzing! want to make those baby shoes last a lifetime? just throw them up in the air right before detonation!

[@grumblycurmudgeon]

Considering the depth of that crater, I suspect "copper-plated Volvo atop a chunk of Finland crashes into airborne seagull, authorities remain flattened" may be more apropos.

[@Strigulino]

“You can weld almost anything to almost anything with explosives”. So many household uses! 😆

[@Tekdruid]

"You know, for welding."

[@datadavis]

Know i know why the finnish guys at work are so good at welding

[@musicjunky1605]

Household friendly too!

[@scanor]

@@musicjunky1605 yea.. as long as you don't set the damn thing off in the household.. then you won't have a household :P

[@thomasa5619]

I’m going to try to weld myself onto things!

[@Rubensgardens.Skogsmuseum]

Customer: Can you exposion weld? Lauri: Kyllä. Later: Delivers something that looks like it has passed earths atmosphere at 30km/s.

[@evilbetty9204]

"You start it we Finnish it." On a T-Shirt. You're welcome.

[@mitchzaleski8558]

I live in a Finnish community Kaleva is its name

[@datadavis]

@@mitchzaleski8558 do you make things go Pomm?

[@Basement-Science]

@Evil Betty make that a finnish flag.

[@bt70a9]

You ring, we bring.

[@josephmiller997]

That's a fantastic shirt. I'd buy that one.

[@CapeCodCNC]

The air gap was WAY to big. It should only be .5 - 3 times the thickness of the copper. It got so hot and gained so much speed it melted before it contacted the steel instead of fusing to the steel. Try 1mm copper with 1 mm gap........

[@gglovato]

i was going to say this, i remember watching a documentary years ago on a company doing this professionally on big plates and it was almost nonexistant gap, they put small spacers all over to keep the gap

[@frankbattista8962]

Exactly...1-4 mm typically

[@frankbattista8962]

...commercially it is typical to use a blast retardant to help control blast intensity as well...but nice first try☺

[@MichaelEhling]

I love that people know this type of stuff.

[@evilcanofdrpepper]

ANY IDEAS ON HOW TO MAKE A C4 POWERED POTATO GUN ALSO YOU GOTTA TRY TO MAKE ONE SHOOT AN ARROW LIKE JORGE SPRAVES ARROW GUNS??? Put a potato through steel, even if its super thin. Can someone calculate how much steel you can shoot fruits and veg through, and thenwe can work out how to make them go that fast and how big the thing has to be? what about a ton of small booms in separate tanks plumbed together? if you get 4mm outer diameter metal pipe also get some 4mm inner dimension pipe and put it on the outside and repeat, maybe filling the space with whatever the people here recommend! Also is putting pvc on the inside as a sacrificial pipe to reduce friction and the load on the steel pipe a good idea or just a waste of money? maybe use metal fins to shape the wave in the tank? Please tell me experts! I was thinking an old propane tank with a port and barrel added with the marble of C4 hung floating in the center of the tank? There are likely better shapes and ways to taper the cylinder down to the barrel size but the concave ends are not bad. an alternative idea is get the biggest steel pipe you can and wrap it in rubber then pour cement around it and box that up. What say you thinkers with brains that know this stuff? is 2/3rds down the tank length better? I have a comment with more of this. Also looking for cartoon shticks they can do with sticks of dynamite like dynamite in gun barrel makes it peel open like a banana? test then try to recreate the cartoon result.

[@PPYTAO]

Henke got so used to TNT, you can see how happy he is to FEEL an explosion again!

[@shagaroohagaroo5416]

Henkka

[@PPYTAO]

SHAGAROO HAGAROO thank you 🙏 I couldn’t see the correct spelling 🤗

[@shagaroohagaroo5416]

@@PPYTAO no problem

[@zabnat]

You probably meant to say dynamite, which is what they usually use. But I agree with your comment.

[@earlcoles5215]

@@zabnat yes, TNT and dynamite are 2 different chemicals

[@Kenionatus]

"Was afraid we didn't use enough explosive." Later: "Maybe the steel boiled or something."

[@norbertfleck812]

The steel was completely smashed and torn Into pieces. I guess this was an excessive amount of C4.

[@12amfion21]

@@norbertfleck812 With a little more C4 it would be possible to do a terrorist attack in North Korea from the ground

[@d.jensen5153]

Absolutely fabulous! Would love to see more explosive welding. Would also love to see more shaped charges using semtex...different liner materials, different geometries, different targets.

[@ZycemniTheSane]

Am I alone just thinking how beautiful that looks? Never mind how good it welded or how much copper stayed. That metal looked really good.

[@jetsi6821]

Watch the pommijätkät channel there are big explosions fking beatifull

[@f.d.6667]

My thinking exactly! Whole generations of potters in Japan were trying to achieve THIS look for the perfect matcha bowl... there is also a dimension of "kintsugi" as the erosion from the liquified copper is resembling the gold of the original kintsukuroi...

[@Codebreakerblue]

Who knew that literal blast waves could look so cool

[@hippiewrathchildz]

Watched a documentary about this process of welding and they had no gap and used Anfo instead of C4. Would love to see you try this again.

[@pirobot668beta]

US layered coins, like the dime and quarter, get their metals fused by this process. Large slabs get welded, then they are rolled into thin sheets. ... There is an artist in Arizona(?) who uses Deta-sheet, flowers and sheet metal to make art. Deta-sheet is essentially det-cord in sheet form. Usually about 2-3 mm thick, PETN and a binder. The metal is decorated with flowers and leaves, a sheet of high explosive laid on top. When detonated, the bits of plant disturb the shock-wave, leaving a floral pattern blasted into the metal.

[@user255]

Link to the work of the artist?

[@essr4580]

Yeah I wanna see this, sounds awesome

[@Tobascodagama]

@@user255 I found a Scientific American article that possibly refers to the same artist, but in typical academic journal fashion the "sample" only has like one sentence visible. Here's the JSTOR link if anyone has the ability to track down the relevant SciAm issue: www.jstor.org/stable/24987131

[@IanGrams]

@@Tobascodagama I have alumni jstor access thankfully. Here's the link to the artist mentioned there's site: evelynrosenberg.com/artist.php?p=9 Seriously stunning stuff. Pillars of Knowledge might be my favorite. Haven't seen any with plants used for the relief like originally mentioned but I suspect it's the artist they were thinking of.

[@coldhotpocket8226]

Sounds like a fun as hell way to make art lmao

[@PeterOekvist]

Looks like a burnt cake😂 How about sawing it in half so you can see the cross cut?

[@Xeridanus]

The copper is so thin it would just look like steel all the way through, I think.

[@PeterOekvist]

@@Xeridanus just curious on how the surfaces look between the layers.

[@Xeridanus]

@@PeterOekvist that's what I'm saying though, probably so thin you couldn't see it well. But I don't know. I think he said it was thicker in some parts.

[@PeterOekvist]

@@Xeridanus so let's find out...

[@AdricM]

saw it at an angle and you might see something.

[@karlhrdylicka]

Anni, Lauri, Hank. You three make a fine pair if ever I saw one. Total nut cases and very entertaining content .

[@icuabc1235]

I found out that if you are in Finland and you hear oopsie, don't wait around to hear daisy.

[@RamadaArtist]

6:02 This is my favorite part. "Did it look like this in the other videos?" "Not in the slightest."

[@ve2vfd]

Looks better than most of my welding ;)

[@raysplace6548]

I definitely felt that..😂😂🍻🍻

[@Sludge73]

Hell yes a part 2 is needed. Great videos.

[@towoperations]

"stuff is still going to happen, because we're using C4" best line of the year. Around 3 minutes.

[@johnbrady7431]

Yeah, it would be awesome to see it done with a slower explosive like anfo! That C4 was probably close to how an antiarmor round would react. Melting through the steel, instead of fusing to it.

[@michiganengineer8621]

From what I've read that's how some anti-armor rounds actually work. A small disc of copper in front of a shaped charge with a proximity detonator. The explosion of the charge essentially forms the copper into a small, super fast and super hot DART that penetrates the armor and then ricochets around shredding everything (and everyone) inside.

[@davidwootton683]

Thankyou for all the trouble you went to, to make this video for us. Most interesting! Yes please can you do this for us again. Kind regards, and greetings from Africa.

[@1DShoe]

I'd really love to see the weld planed down, or machined down evenly - just to the point where it's level - to see what it looks like. it might just be something cool that you could keep as like an art piece or something.

[@guffaw1711]

I think most of the copper evaporated. Thicker copper plate and less explosives next time, and no sand around. Really hope you try this again! Also I love these explosion videos where you don't destroy something but create something new!

[@wayne1959]

yes we need more explosive welding until we see an a class result. love your work guys.

[@Issac_The_Last_N7]

This is amazing! I love how loud C4 is

[@nelsonbergman7706]

Moi. As always I love sounds in slow motion and I love Anni's laugh. Thanks Moi Moi

[@theonlybuzz1969]

With seeing explosive welding carried out in the past and knowing what is involved etc, looking at your version of the process, the copper wasn’t thick enough and the explosive used wasn’t c4 or dynamite but the one typically used in mining as it’s levelled really precisely and like the world and it’s wife also said air gap too big, the other differences are that the people doing this properly have done it in a mineshaft for containment of material and the noise too.... I enjoyed the show thanks 🙏

[@WoodworkerDon]

The Macro zoom in starting at 10:00 is really interesting. Prrrriiiitti Guud extreme close-up photography.

[@HydraulicPressChannel]

Thats 100mpix photo from Samsung S20, works pretty well for a phone on this kind of stuff

[@juhonikula6408]

@@HydraulicPressChannel "Hups väärä käyttäjä"

[@CJ-hw4zc]

Dear Beyond the Press: awesome videos! I love anything having to do with the science of energetic materials! I think you should try this one again, but using an explosive with a slower VOD. I think c4 is too fast, and it ends up splattering the copper instead of keeping it together in one piece. Try Dynamite, or even ANFO. There should be an optimal VOD that keeps the copper in one piece, yet still slams them together with enough force to weld.

[@wim0104]

more of an instant spray weld than an explosive impact weld

[@RabbitsInBlack]

They obviously were doing it for fun because this is not how you weld. And Spray Welding would be way more controlled than whatever the hell you want to call what they did.

[@WoodworkerDon]

"Like someone vomited the copper." Quote of the year.

[@kasnitch]

I used to be a hard rock miner here in Ontario . Loved blasting rock into small rock using various explosives and techniques. There used to be a CIL product called Power Packs . It was a nitro based explosive that came in a plastic sleeve and weighed about 1 lb . However, I found it to be very effective on large oversize rocks if I cut open the package and shaped the explosive inside very similar to a chocolate drop and placed a blasting cap into the tip of the charge . This explosive felt very much like modelling clay .. very nice and formable . After the shot , there was nothing left of the large rock, just shattered into much smaller pieces . Sure beat hell out of carrying a jack leg over the rock pile and having to drill a shot hole into oversize . Bloody hard work that .

[@robertreynolds9228]

Very cool looks like contamination from surrounding materials. Shaping the detonation would probably give more uniformity.

[@bob2859]

I'd love to see comparisons between different explosion energies... bonus points if they are detonated sequentially!

[@sakaspuds]

this is the content i want, i love this channel

[@julian9579]

the closeup of the cut looked suprisingly amazing 😂😂

[@dukesaunders680]

Thank you for this. More please!

[@craignapoli]

I love your videos, I always learn something and i always laugh a lot, i can't thank you enough.

[@zerg9523]

Okay... Some suggestions with physics in mind. - Do not raise the copper _”source”_ above the steel _”target”_ . Place them in direct contact with each other... Having the source and target apart allows for deformation of the source way before the weld can ever occur at the target... That is why shape charges in things like RPGs detonate at a small distance, so the cone shaped copper has time to deform and form a jet before impacting the target. - Do not initiate the detonation from the centre. Initiate the detonation from an edge or corner... Initiating from the centre would cause energy to focus unevenly and will likely cause greater overall deformation... Allowing the detonation wave to progress from one side to the other reduces and evens out the overall focus of energy. - It would likely give the most even and repeatable results if you used a powder explosive. Again placed in contact with the source and target, still detonated from an edge or corner. - If you can use a powder explosive, slowly increase the depth of explosive powder completely covering the source so you can achieve the weld with minimal explosive compound and the least collateral damage. - If you are stuck with solid explosives (what a shame, lol) try to lie it as flat and evenly on top of the source and target, initiating the detonation from an edge or corner. Great work guys, keep it up with the crushing and blasting.

[@zerg9523]

... continued ... - As a curious side question. I am not entirely sure at these sort of energies if having machined flat and clean surfaces would make a significant difference to the results. - It would be interesting once you have a repeatable experiment going, to test the differences in very well prepared material faces and equally rough material faces. Sorry for the overload, such a good home-brew experiment, I couldn’t help it.

[@kenirwin276]

The explosive welding I have seen was making copper clad steel. The used a large slab of steel and placed copper sheet on top using seperator pieces to hold them apart about one centimeter. They initiated the explosion from one corner so it traveled across the piece. I'm pretty sure they didn't use C-4 as it has a burning rate much too fast.

[@Meevious]

That frame at 4:00 shows the magic very well!

[@goneweldin8181]

Love the States shirt he’s wearing! Keep up the good content its some of the most interesting stuff i watch, I’m currently in school for welding tech so this was super cool.

[@Zeinzu2]

YES. Please do this again. Lets have a series of tries until there is a proper welding of the 2!

[@stevebuncic9362]

What you presented was the effects of a " shaped charge " explosion. Two explosive materials are set inside a projectile the first being like your demonstration , a contact explosion of molten copper hitting the target with then the main explosion after the target has been melted.

[@maverickmeteor]

"Don't try this at home". Phew, thanks. I was just about to order 50 kilos of C4 on Amazon. Lol! Great video!

[@nocount7517]

I got a Mr. Clean Magic Eraser ad. How appropriate.

[@davidchristensen2970]

We most definitely need more like this.

[@prinzeugenvansovoyen732]

Amazing video, you need to smoothen the upper side of the explosives more even and reduce the distance from steel to copper to abaut 1cm Can you try shaped charge versus big rock - i allways wondered why shaped charges are not used in underground mining since they are pretty precise and fast to set up

[@forrestaddy9644]

I've machined miles of aluminum plate explosively bonded to steel to make faying strips for welding an aluminum deckhouse to a steel deck on a ship. The paperwork that came with it described the process fully. Ir was 40 years ago but I recall it well. The steel plate to be bonded was placed flat on a 14" thick "inertia block" (can't recall the official name) made from a salvaged chunk of battle ship armor plate. There was some form of barrier between the plate to be explosively bonded and the anvil block so the two wouldn't bond. I think it was a couple layers of plain paper. Both the steel plate to be bonded and the aluminum were freshly sandblasted to white metal. They were spaced about a millimeter apart with bits of aluminum wire scattered randomly and sparsely. This spacing was critical. The closing velocity if too low wouldn't bond: if too high the softer metal would squirt out like mayonnaise. They controlled the closing velocity by controlling the spacing. The explosive (I think it was AMFO, a white powder, anyway) was spread on top with a screed to a specific thickness. The explosion was initiated by a booster strip and a cap array to start what was called a "linear wave" the full width of the plate. The steel was roughly 20mm thick and the aluminum 15mm. The bond was very difficult to machine through to make strips. We used regular lathe parting tools in a planer. The interface undulated something like ocean waves and the crests were very hard. They'd catch and break the parting blade once or twice per part no matter how careful we were. The bonded plates came in 4 ft x 12 ft (1.2 x 3.6 meters) pieces which we parted into 25mm strips the length of the plate. It was mostly an easy job until we hit the interface: that was a nightmare. Here's a link to Pacero Products, the successor to Northwest Technical Services who supplied the material to us in the late '70's: pacaero.com/products/explosive-bonded-metals/explosive-metal-welding-technical-overview/ Google has pages of offerings using "explosive welding" as a search term.

[@bernardfender5147]

When you have access to super high speed camera again you could have a race between prince Rupert drop and sausage of C4

[@tbomberus]

Words to live by: "You can weld anything to almost anything using explosives."

[@agentfrankvideos]

And... You can get shit stains out of your shorts with explosives too ! But that don't mean you should !!

[@caryfuk8]

Hi, do you hear of SEMTEX? Its plastic explosive like C4 but i hear, its 4x more eficient ;) Its from our country Czechoslovakia

[@jiminycricket2230]

Its hard to believe this is common place but it is. I've wielded clad steel that was used in mining operations. Wite iron to mild steel for use in stone crushing operations. Great experiment though. I really like it. Id like it if you did some more for sure. 👍

[@mjproebstle]

fun video! would like to see a second try, and this time please show how the explosives were packed around the two metals. cheers!!

[@Silvertone2000]

Nice Slav squat! Heels on the ground, comrade found.

[@taliawtf6944]

The explosion has to be super exact and be in a wave type trigger so it has a uniform force from one side to the other pushing the air from between the two metals and have a much smaller gap between the two. But Holy cow that actually fused the two together. xD

[@ianhowick]

"Professionally Explosion Welded Parts" Something about this phrase excites and terrifies me at the same time.

[@MrJunkiePlay]

Ngl The c4 looked allot like an Omelette .... a very deadly Omelette

[@nelsonbergman7706]

Also similar but different. Many railroads weld their rails with thermite. Maybe something to try some day.

[@VIPER410]

That is pretty cool. Definitely would like to see more videos of explosive welding. Try making diamonds with explosives.

[@FlyByPC]

Nice. Cross-section it on a bandsaw, so we can see the transition layer.

[@Babarudra]

Very cool. I hope your vacation is going well. Although you're probably working on moving, so not much of a vacation.

[@TS_Mind_Swept]

1:10 C4 has been my favorite since I first saw it years ago LUL

[@EddieBurke]

Thats one of the most Finnish titles I've ever read.

[@jcims]

You might try opening the other end of the shipping container to help equalize the blast pressure. Also orient it so that the long wall is parallel to the blast wave coming at you.

[@Xeridanus]

Pretty sure it's already orientated that way. Opening the other end could also be a good idea, unless the explosion is in that direction. Not sure.

[@datadavis]

They are grown finnish men, they dont need pansy tactics like that.

[@Xeridanus]

@@datadavis Pretty sure Anni was doing the filming.

[@datadavis]

@@Xeridanus pretty sure she is a grown finnish woman🤔

[@73107kevin]

Yes, find the right amount of explosive to use and try again. Maybe a steel plate below weld material to prevent movement of material away from explosive force.

[@notnerd3]

“Don’t try this at home.” I’ll bear that in mind next time I have plastic explosives and a copper plate.

[@elainetreadwell5576]

I would like to see it done again. Thank you very much.

[@gafrers]

Awesome. Hope to see more and with different metals and semi-metals if possible

[@Sunlight91]

You want applications for explosions? Try pulse propulsion. It can be used for any kind of vehicle. The ultimate version of it is nuclear pulse propulsion for spacecraft.

[@korppiprkl]

You should try to make a cross section cut with band saw. Use slow feed rate and fast cutting speed to get the best finish. There you can see the quality of fusion more clearly. You can also grind and even polish it to have a shiny result.

[@westherm]

I don't have anything to add about explosion welding but a Beyond the Press video attempting friction welding would be cool.

[@robertwilliams8450]

That was SO AWESOME!!!

[@EmrakulThePacksTorn]

As an American Finnish man, I want your shirt Lauri! Is it merch I can buy?

[@ThompaThelin]

proffesional Finn !! love it !! ha ha ah ! As a swede from Gothenburg I love the Finnish people , suomalaiset :) (except when the beat us in icehockey)

[@jaremarandall4386]

When i did this proces as part of lectures on Uni I used much slower explosives, like ANFO. And for explosive welding two plates 12mm thick each best distance was thickness of safety match. IF i remmember properly i used around 200g for each 250 square cm.

[@MrSmith336]

'Ya think you used enough dynamite there Butch?'......said Robert Redford, Butch Cassidy and the Sundance Kid.

[@Boabreath]

It would be cool to see you try thermite welding of something other than railroad track.

[@zachyoung5598]

Use low VOD explosive, a smaller air gap and inert buffer between explosive and flyer plate. You can also use the inclined method to achieve uniform impact angle.

[@ShadowzGSD]

I can't help but think how awesome it would look if you had a ton of different coloured powdered paints on top, i am thinking of a rainbow coloured mushroom boom

[@Alltakenbla]

Wicked sense of humor

[@MrChina200]

Wow what a great job guys. I'll have to get Bomb Hank over to weld some repairs on my trailer some day 😂

[@mduvigneaud]

I've seen explosive-welding videos in the past, primarily using ANFO. I'm not sure but I think it's preferred because it's a slower explosive.

[@mduvigneaud]

The videos of the absolutely awful, devastating explosion in Beirut, the fireball was only a single frame and several hundred meters. :( That was just ammonium nitrate.

[@TheAruruu]

C-4 is classified as a "High Explosive" because of its extremely high 'burn' speed. Speed is good for cutting and destroying. ANFO is classified as a "Low Explosive" because when it detonates, it pushes instead of punching. That's why it's used for explosive welding. Example: How far can you make someone (or something) move by punching them (or it) as compared to placing your hand on them (or it) and pushing. Side note: ANFO needs a minimum amount to detonate, and that minimum is significant. A test of this scale may not work if you try it with ANFO.

[@Prostaneverayatno]

Brilliant video, please do more very interesting result. For small home applications would very cool. (Of course done safely)

[@nonoDIY]

Yes it would be interesting to see more of explosive welding.

[@rootbrian4815]

That explosive weld wasn't bad!

[@scrogfpv7443]

I’d like a part 2 for sure

[@Glyxis.]

@Beyond the press Actually there is a reason why you should would use ANFO as an explosive in this kind of stuff. ANFO is known for that it is very "slow" explosive and it's shock wave is much more "gentler" and "pushing" so it moves objects way better, meanwhile other explosive's shock waves are too fast and they are just ripping and destroying everything in it's way.

[@Sarthorius1968]

There is a way to make diamonds with an explosion? Like crush graffite between two stell rods?

[@corwinhyatt519]

Reading over the other comments I think a comparison test using anfo would be a good idea. Re: explosion welding. Sort of like hammer welding but using an explosive to provide both the heat and pressure instead of a torch/forge and hammer. Interesting.

[@P8MMES]

C4 has an destruction effect. ANFO has a pushing effect

[@lifewithmarleyandjon4616]

Please try again! Also thermite welding is pretty interesting

[@campsitesweden]

Really good, just need a bit of tuning the c4 to get that clean and shiny end result :D

[@ChipGuy]

Yeah I would definetly like to see different explosives. I also wonder how you could weld powdered metals that you can't intermix the usual way to form an alloy.

[@TheAttacker732]

An interesting idea, and it might make for some unusual material properties. Hell, these guys could probably look into it. It would make sense to press the powdered metals into a solid 'cake' to make it easier to work with. From there, sandwich between two layers of metal & blast weld the whole thing? It seems like it would work, whether it does & whether it makes something useful require testing.

[@ChipGuy]

@@TheAttacker732 Vishay does that stuff in Israel. They make metal foil resistors. Goal: Combine different metal foils in a way that the material does not change resistance with temperature, or as little as possible. Problem: The metals don't want to become an alloy. Solution: Press them together (they still refuse to bond), print a very thin layer of secret ingredience high explosive gel on them, put them in a special press and then "BANG". The metals finally weld to a stable material that can then be applied onto a ceramic carrier where more processing, like etching, passivation and contacting is being done. At the end they cost like 20EUR+ per piece.

[@TheAttacker732]

@@ChipGuy Huh, cool.

[@ChipGuy]

@@TheAttacker732 They also got a channel on here: "VPG Foil Resistors"

[@wrekced]

A long time ago I saw an artist use explosive sheets to form metal over a baked clay form with a result that is similar to repousse. The clay gets powdered but the metal retains the shape. I'm not sure which explosive she was using. It looked like it was about 4mm thick. I think the metal was copper sheet about 2mm thick. I think that your welding would turn out better if the C4 was more uniform in thickness. Perhaps it could be applied with a rolling pin for baking...

[@HackSawSees]

A friend once worked for a place that made big dish antennas with explosives. They had a form made of concrete, and the would lay on the steel, and explosive, and a big containment dome. I don't know how important the dome was to the process. I made me wonder what sort of shapes you could form that way.

[@macnudd]

You need a 25mm steel plate about 100cm square to sit on the ground as a backing plate to the steel and copper plates you wish to explosive bond. Start the explosion from one side to allow air to escape as the explosion travels to the other side of the plates being bonded. By the looks of the copper, you might want to reduce your explosive charge by 30%.

[@markroper9269]

Great video! C4....duh! I see some interesting tattoos on your explosive friend.......care to elaborate?! Love your stuff guys!!!

[@123holsey123]

Be safe have fun thank you for sharing

[@putteslaintxtbks5166]

I think it would have worked better with steel (harder and more sacrificial material) on top and a very small air gap, like 2-3mm or less than an 1/8". Also put blasting cap in the dead center of the top. The C4 should be even thickness and perhaps none on the outer 25mm or 1inch.