Welding in Space

  • Added:  9 months ago
  • In space, metals can weld together without heat or melting.
    Check out Audible: bit.ly/AudibleVe
    Support Veritasium on Patreon: bit.ly/VePatreon

    Written by Joh Howes and Derek Muller

    Yes, it's pronounced Gemini (ee not eye) because that's the way everyone pronounced this mission.

    Thanks to Patreon supporters:
    Bryan Baker, Donal Botkin, Tony Fadell, Saeed Alghamdi

    Gemini IV transcripts: www.jsc.nasa.gov/history/mission_trans/gemini4.htm

    Gemini IV recordings:
    archive.org/details/Gemini4 (relevant clip is 1297 at about 2:00)

    ESA cold welding recommendations:

    Cold welding gold nanowire:

    Music by Kevin MacLeod "Intrepid" www.incompetech.com
  • EducationEducation
  • Runtime: 6:53
  • veritasium  cold welding  welding  space  gemini iv  gemini  gemini 4  galileo  spacecraft  international space station  iss  weld  metal  structure  ions  alloys  esa  fuse  metals  sea of electrons  lattice  crystal  

Comments: 1 529

  • Dan Sneyd
    Dan Sneyd 3 days ago

    Do they ever hot weld in space? No need for any shielding gases. Probably still a bit risky. Melting holes in your space suit wouldn't be fun

  • JoseitoEdlVodao
    JoseitoEdlVodao 6 days ago

    And I thought oxide was the bane of all metal.

  • MultiGazman
    MultiGazman 15 days ago

    Stupid video!

  • jane mark
    jane mark 17 days ago

    사기꾼 겁나 사기 잘 치네... 금속을 땅콩바에 비하냐... 게다가 냉간용접 있지도 않았다며... 대중을 참으로 잘도 기만하네... 본적도 없는걸 본것 처럼 이야기하네...

  • RaptoJP
    RaptoJP 17 days ago

    For some reason, at 4:44 I felt like you were giving us 3 tips on how to build spaceships with proper materials.

  • MonsterCar(YT)
    MonsterCar(YT) 23 days ago

    Man this channel is really cool it's good for kids like me

  • Kerry C
    Kerry C 23 days ago

    Tail? Tale! Good video

  • Braadkuiken
    Braadkuiken 26 days ago

    I mean, it makes complete sense that this happens, if you look at it at atom level

  • shape shifter
    shape shifter 26 days ago

    This must be comedy, this first guy is clearly not in space. In fact I believe space travel is a lie.

  • ocelot48gaming
    ocelot48gaming 29 days ago

    I wonder if it is so hard technically to create a line of production in automotive to weld parts together with this method?..

  • GDSlimed
    GDSlimed Month ago

    welp now i want chocolate covered peanut bar

  • Jin H
    Jin H Month ago

    this is a B.S. channel.
    I hope people dont buy this lie

  • Bruce Werlhof
    Bruce Werlhof Month ago

    English captions are bad for this video please fix

  • Uwera Tryb
    Uwera Tryb Month ago

    who else saw wedding in space

  • Yuriy K
    Yuriy K Month ago

    very interesting! but you gotta work on your visualization man (no eating while talking)

  • A.S. the world Doesn't turn

    Man has never been to the moon !!

  • Fransella Blasco
    Fransella Blasco 2 months ago

    Why is he not my professor in my college? He always finds an interesting way to explain anything and everything to you ! If he gave my mi organic chemestry, my advance calculus and physics courses I would have been a very happy student 😂 much love ✌️

  • JH Wong
    JH Wong 2 months ago

    Great video, thanks! Explained to me why we can't just stick two pieces of metal together without external forces since they are only hold in place by the "sea of electrons"

  • Gaydolf Hitler
    Gaydolf Hitler 2 months ago

    so to weld in space you need windex and a scrubber?

  • Mwongera Mwarania
    Mwongera Mwarania 2 months ago

    Welding is not afterall for greasy dirty and poorly educated Red necks 🤣

  • re frigerator
    re frigerator 2 months ago

    so hes saying you cant fuse caramel with toffee nut?

  • re frigerator
    re frigerator 2 months ago

    thats how you get ants

  • Tony Cavazos
    Tony Cavazos 2 months ago

    now i want a payday candy bar

  • Anarama
    Anarama 2 months ago

    oh no the robots cant have sex now. theyl get cold welded together in space

  • Bill Gates
    Bill Gates 2 months ago

    Put a coating on metal that make the surface really rigged so they can't combine because there is a coating to prevent that from happening

  • Gary Mike
    Gary Mike 2 months ago

    I remember learning this in Welding class. Its supprising that most welders don't know this.

  • Anik Kundu
    Anik Kundu 2 months ago

    I feel hungry

  • joespeed1952
    joespeed1952 2 months ago

    Geminy? How about Gem-In-Eye? Like seriously from all the people whose zodiac sign is Gemini, that kinda upsets me.

  • Chris Baer
    Chris Baer 2 months ago

    Gage blocks

  • taylor tenley
    taylor tenley 2 months ago

    Linex it

  • eboomer84
    eboomer84 2 months ago

    This is something all mechanical engineers encounter, in a vacuum or not - we call it "galling" (adhesive wear). Aluminum and stainless steel really tend to do it.

  • bluefmi
    bluefmi 2 months ago

    "thermal shock as the satelite passed from HOT to cold areas" pressure can fuse items together. no need for vacuum (and high pressure produces heat). but i agree, clean surfaces will help the fusing

    "jammed momentarily" does "momentarily" sound like "small adherence" or like "fusing" to you?

    you shoud actually read carefully what you present. heat was clearly presented in the paper.

  • Anon Gloria
    Anon Gloria 2 months ago

    Is it me or is this guy the hottest scientist there is?

  • dows555 khan
    dows555 khan 2 months ago

    i read the title weddug in space. lol

  • Jonathan & Ashley Vasquez

    this is false... you know nothing about metallurgy

  • Harshit Tewari
    Harshit Tewari 2 months ago +1


  • Carver
    Carver 2 months ago

    You say you dislike ads, but then you make yourself the ad at the end of the video. Also Audible gives everyone a 30 day free trial, so this isn't a deal at all. Boooo.

  • Dane Madsen
    Dane Madsen 2 months ago +1

    Sponsored by payday

  • Ernest Workman
    Ernest Workman 2 months ago

    Arrghhh! I got arc eye from watching it!

  • Touwtje
    Touwtje 2 months ago

    Interesting.. but you did not tell us how they actually weld in space? Does it work to just use a 'normal' welder or?

  • Seán O'Nilbud
    Seán O'Nilbud 3 months ago

    It's Gemini not Jiminy, if a bunch of illiterate muricans can't speak properly it's rude to make fun of them by repeating their hillbilly barbarian error.

  • Jørund Eldøy
    Jørund Eldøy 3 months ago

    So next time we want to weld a metal chair together but we don't have a welding tool, we just use millions of dollars to send it up to space?

  • Accrsd
    Accrsd 3 months ago

    see now this just makes cold welding should be used to construct spacecraft in space...

  • junoguten
    junoguten 3 months ago

    Will cold welding really connect that strongly though? I mean I don't imagine most flat things us humans manufacture are really that flat on an atomic scale?

  • Ausintune
    Ausintune 3 months ago

    i want that candy bar

  • BlueHawks
    BlueHawks 3 months ago

    Finally som1 Elise who appreciates payday bars

  • jholotan best
    jholotan best 3 months ago

    how does the gold welding in the atmosphere

  • nonya damnbus#1
    nonya damnbus#1 3 months ago

    Dammit now I want a payday bar.

  • Harsh Gupta
    Harsh Gupta 3 months ago

    i don't understand who dislikes videos like this

  • blackcatooow
    blackcatooow 4 months ago

    Get a camera with optical image stabilization. Your camera makes me dizzy

  • alfalfa fonzo
    alfalfa fonzo 4 months ago +1

    4:20 who else hears a cockroach making its way to you from under the floor?

  • Based God
    Based God 4 months ago

    if the space story had nothing to do with cold welding why even mention it?

  • Golden Grenadier
    Golden Grenadier 4 months ago

    I bet soldering is easy in space.

  • Dan Crouch
    Dan Crouch 4 months ago

    do you need any shielding gas in space with there being no air.

  • T.P.K.
    T.P.K. 4 months ago

    yeah they slather grease on everything to mitigate any chance of stickage. The bigger the glob the better the job.

  • Matthew Topp
    Matthew Topp 4 months ago

    I wonder how well a custom truck bumper wold hold up if you cold welded

    WOFGH 4 months ago


  • Eagles_Eye
    Eagles_Eye 4 months ago

    .. i tought it was about welding in space... dissapointmentttssss

  • Tadesan
    Tadesan 4 months ago

    Why are you (and most other channels) asking for financial support? If making these videos is such a burden then stop making them.

  • Nicolas Gleason-Boure
    Nicolas Gleason-Boure 4 months ago


  • Cameron Wofford
    Cameron Wofford 4 months ago

    1 payday + 1 payday = SUPER PAYDAY

  • 777Dubliner
    777Dubliner 4 months ago

    stainless steel loves to cold weld, I was assembling a part when I was new to the machine shop Im at and wasnt told about applying anti freeze, the bolt went in but I had to take them out because I forgot a part to put on and one locked right up, that was my first and this far only experience with it, lesson learned

  • Noah Williams
    Noah Williams 4 months ago

    Are cold welds weaker than heated welds?

  • Kainafar
    Kainafar 4 months ago

    If something is sufficiently flat, it will "cold weld" in the earths atmosphere. High quality gauge blocks will do this.

  • abc def
    abc def 5 months ago

    cold welding shouldnt take place, all the youtube videos i saw, they were pressure weldings or friction weldings or electrical potential weldings, including this video. they seem to insert the external energy into the system of metals, this is a cheating.

    because when an electron tries to leave the metal, an image charge appears in the metal, and the metal sucks back the electron into the metal. in other words, a work must be done on the system to eject the electron. please check E&M 101.

    Feymann was wrong, or he probably meant the nano meter sized metal where QM dominates. the nano size is not in the region of the classical realms of physics.

  • superslash946
    superslash946 5 months ago

    Man, you truly are an inspiration. Your videos are by far the coolest educative vids out there! Just wanted to tell you I just finished a university paper on cold welding inspired/based on this video! Thanks for the help! xD

  • me larrieu
    me larrieu 5 months ago

    Footage is stop motion smh

  • Brian Kelly
    Brian Kelly 5 months ago

    Chocolate covered Payday bar. Finally science has made practical advances!!!

  • bdub z
    bdub z 5 months ago

    he's never gonna forget gloves again if he touches that filler with the torch lol, especially on ac

  • tjrsasea
    tjrsasea 5 months ago +1

    Hey guys! Support my photobook about Space titled Ethereal that will literally bring you out of this world on Kickstarter www.kickstarter.com/projects/1726456725/ethereal-literally-out-of-this-world The campaign is ending very soon! Thank you! :)

  • Peter - John Jones
    Peter - John Jones 5 months ago

    ive clicked on this vid because the caption actually made me laugh due to my (low) understanding of welding aha

  • Nicholas Rapacciuolo
    Nicholas Rapacciuolo 6 months ago

    Is it just me or do I want that nut bar

  • Matthew Linn
    Matthew Linn 6 months ago

    You talk like cold welding cannot happen on earth in normal atmosphere. It happens a lot that is why we have to use antiseize some of the times.( I know that is not the main purpose of antiseize.)

  • Huemid
    Huemid 6 months ago

    The footage of Gemini looks like stop motion, was it a recreation of what happened or is the video sped up?

  • MyParkour121
    MyParkour121 6 months ago

    "You have to heat them past their melting point" - ever heard of forge welding ? the temperatures are close to melting but still more than 100°C (Sorry I don't know the Fahrenheit scale) lower than melting.
    please correct me if I'm wrong, it may be that with the plastic deformation of the steel the temperature at the welding surface rises above the melting point, but that I doubt. So as far as I know you can indeed weld steel without melting it.

  • cryo phile
    cryo phile 6 months ago


  • Protein Strands
    Protein Strands 6 months ago

    this is incredible

  • daft nord
    daft nord 6 months ago

    i just slightly cold welded two hard drive platters together. highly polished things can do it in earth atomsphere

  • Teodor Foca
    Teodor Foca 6 months ago


  • Ivan Quaglia
    Ivan Quaglia 6 months ago


    GRD PROJEKT 6 months ago

    0:06 Science is about to hap.. hang on, different channel

  • King of Cannabis
    King of Cannabis 6 months ago

    I wonder if Juno's jammed up fuel valve may have cold welded.

  • 10DBott
    10DBott 6 months ago

    cold welding seems to be the same as forge welding just without the heat and flux to keep the oxygen off

  • Devesh Dadhich
    Devesh Dadhich 7 months ago

    "Manufacture Nanotechnology" Really? Did you mean manufacturing nanomaterials?

  • Anubhav Yadav
    Anubhav Yadav 7 months ago

    best example of candy bar dude

  • Rylan Delap
    Rylan Delap 7 months ago

    why wouldn't the same materials that aren't metal still cold weld when rubbed together in space?

  • Scott Hannan
    Scott Hannan 7 months ago

    This really gave our astronauts a chance to test their metal/mettle.

  • Justin Murtagh
    Justin Murtagh 7 months ago

    Wow, Americans pronounce "Gemini" like that? Sounds so weird to me :).

  • The Sqoou
    The Sqoou 7 months ago

    Is cold welding synonymous with cold fusion ¿

  • firecrow 797
    firecrow 797 7 months ago

    payday is my favorite candy bar

  • Slizarus
    Slizarus 7 months ago

    I wonder if Kerbals know to coat their metals.

  • Memawandpatrick
    Memawandpatrick 7 months ago

    Tfal then?

  • Kenneth Fung
    Kenneth Fung 7 months ago

    do the crystal structure of metal needed to be the same?

  • ThePilotPenguin
    ThePilotPenguin 8 months ago +1

    Remember to put on your welding mask at 0:09

  • Ian Robinson
    Ian Robinson 8 months ago

    man i love your channel. Thanks for this.

  • FE comando
    FE comando 8 months ago

    Sooooo NASA fanboy! You have been asked to reinforce the fakery of scientism agenda! Here is how selling out will cost you a LOT in a very near future. A future where people like you are going to be disregarded and discredited so harshly I will even feel bad. If it is intentional like Vsauce, we will know, if it is because of your lack of education and ability to understand the realm we live in then you still have a small window and come around explaining why this video along with other ones are pure propaganda and does not have any tangible content.
    Time will tell

    • Tordah!
      Tordah! 4 months ago

      You're stupid, go back to you flat earth comedy channels and leave the grown ups alone.

  • kairon156
    kairon156 8 months ago

    I never heard of cold welding before. I know on earth Tungsten usually doesn't like sticking to other metals so I wonder if that would be a good one to use on space craft.

    How big can we use cold welding? can 2 metal ingots be cold welded together? can we weld space crafts or stations using cold welding?

  • Matt Macken
    Matt Macken 8 months ago

    I understand why objects of different materials or alloys won't 'cold weld', but why won't materials other than metal fuse together is space? If you have two identical pieces of plastic, what about plastic, keeps them from sticking together? Plastic is just one example, you can insert other items in it's place, but the question remains.

  • Eleazar Barrios
    Eleazar Barrios 8 months ago

    Gave us those cold welding tips like were going to be using them

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