random welding question..

  1. qwakers Member

    Messages:
    115
    Location:
    cornwall, united kingdom
    whilst watching a episode of star trek this evening, it occurred to me.

    mig welding in space, no air, so no need for shielding gas.....

    discuss. :D

    what would a weld look like in a vacuum?
     
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  2. TechnicAl

    TechnicAl Member

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    Electron Beam welding is performed under vacuum
     
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  3. qwakers Member

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    115
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    cornwall, united kingdom
    interesting :D

    has anyone tried mig though :D

    or tig, im not choosy!
     
  4. TechnicAl

    TechnicAl Member

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    What about Gravity or the lack of.....would the weld float up out of the joint?
     
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  5. qwakers Member

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    115
    Location:
    cornwall, united kingdom
    indeed. its a interesting concept, and id love to see it done to see what would happen.
     
  6. Paul.

    Paul. Moderator Staff Member

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    The gas is much more than a shield, it provides arc stabilization and narrowing, wetting of the molten pool by lowering surface tension, and ionises to increase the arc temperature, Its a quite complicated and interesting subject, I studied it some 40 years ago as part of a welding technology course, and after all this time have forgotten most of it!
     
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  7. toddy

    toddy Member

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    535
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    Basingstoke, UK
    well arc welding in a vacuum would have problems due to there is no pressure.
    this would effect the metal in transfer from the consumable to the joint. this would be due to the metal plasma "spray" would have nothing to hold it together, if anything it would effectively pull the metal transfer apart.

    to combat this you would need a magnetic field around the arc to confine the arc and metal plasma.

    as well as the melting point would be dramatically reduced too


    this is just my quick 2 pence worth, maybe more later.
     
  8. 4String. Member

    Messages:
    451
    Location:
    Weardale
    Utter nonsense my man. The arc would flow most splendidly and stick like s**t to a blanket, because as these chaps will testify:


    191826e9eb9ab08825b381df8fb6a1f3.jpg

    Resistance is futile :o:whistle::D.
     
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  9. bourbon Member

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    Lichfield UK
    Where you going to plug it in?
     
  10. Cobbler

    Cobbler Codger bodger

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    There you are, fitted to every good spaceship!
    1EA09CBA-AC51-4FA4-94EF-F9BB57C81D86.png
     
  11. AndySV1K Member

    Messages:
    75
    Location:
    Northampton UK
    Can't you just clean the metal faces and touch them together in space. Cold welding it's called.

    Early space pioneers thought it could end up being a big problem as metals of the same type when touched together in the vacuum of space would simply bond to become one. However I don't think that panned out as surfaces oxidise and are coated so it's never really caused a problem.

    would be a cool thing to try out......although nowhere near as cool as actually getting to go to space in the first place though!
     
  12. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

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    My luck I’d get to the job and then remember I’d left the rods in a space van:sheep::laughing:
     
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  13. 4String. Member

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    451
    Location:
    Weardale
    I reckon you lot are over-thinking this.

    Ditch the mig and stick and weld with gas. There's plenty of oxygen available via the replicator, and use bottom burps for fuel, simples :D.
     
  14. Paul.

    Paul. Moderator Staff Member

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    Location:
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    Without the gas there would be no plasma stream, plasma is a hot ionized gas, also known as the 4th state of matter.
     
  15. toddy

    toddy Member

    Messages:
    535
    Location:
    Basingstoke, UK
    yes but the metal would become plasma in a vacuum

    as in electron beam and laser welding in a vacuum you get a plasma.
     
  16. 4String. Member

    Messages:
    451
    Location:
    Weardale
    Scotty would have simply dropped out of warp and tapped into a plasma conduit. It's not rocket science :doh::D.
     
  17. skotl

    skotl Forum Supporter

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    Location:
    Edinburgh, UK
    [​IMG]

    ...or do you think this would be over the baggage allowance?

    Hmmmm... wouldn't need the wheels in zero-g :whistle:
     
  18. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

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    13,998
    Location:
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    Is that for when the batteries go flat:sheep::scared::laughing:
     
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