Welding thin stainless with wood beneath

  1. Mike B Member

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    Location:
    North Wales
    How thick would it have to be to stand a chance of being welded? 1mm is getting pretty thick considering large portions of the roof will be up to three layers by the time they're folded on the ribs
     
  2. Mike B Member

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    Location:
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    roof-zinc-1.jpg Screenshot 2019-10-08 at 20.06.50.png Screenshot 2019-10-08 at 20.06.36.png
     
  3. Mike B Member

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    76
    Location:
    North Wales
    So the image shows the desired effect, although it'll be in stainless. Next drawing shows the ribs along the roof. The next drawing shows the extent of the steel sheet. Multiple C-sections that fill the "troughs" with mating caps that will slide over those C sectoins and then be hammered flat. If I go too thick on the steel, this'll be really tough to get neatly folded flat. The issue is at the fron of the roof where I'll have a castellated portion of steel, whicn I can fold carefuly to an extent, but want to TIG all the way across to seal the entire roof section as on stainless clad slab. Hope this makes sense to you guys.

    So, would a compromise and maybe 0.75mm thick sheet be weldable? With a copper shielding layer beneath?
     
  4. Brad93

    Brad93 M J B Engineering

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    Blimey. Youve got no chance keeping that flat.

    That needs clamping with copper bars, I’d use high speed pulse and autogenously weld it as quick as possible.
    Even then I’d expect it to be crowned somewhat and require flattening on a brakepress.
    0.5mm is really fine. You’re talking about 15-18 amps or so.

    What tig set have you got? Most cheaper sets wont even hold a stable arc at those amperages.
     
  5. Brad93

    Brad93 M J B Engineering

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    @Richard. And I used to muck around with some 0.5 and 0.7mm test pieces. Around 3” long butted together. Each piece about 1” wide.

    In a steel and copper jig.

    Came out bent up like pretzles.
     
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  6. Mike B Member

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    76
    Location:
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    I have a Murex TradesTIG AC220, but to be honest I dont have the skill to weld it, so would be looking to take it somewhere
     
  7. Paul.

    Paul. Moderator Staff Member

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    Now I've seen what you are trying to do I would advise having a rethink, as said you'll never keep it straight, you may struggle to find someone willing to take it on, I probably wouldn't, jobs like this to people like me are usually more trouble than you can ever charge for, and when they go wrong its always our fault,
    Cant you just fabricate a roof out of stainless sheet, say 1.5 or 2mm thick, and forget the wood altogether?.
     
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  8. zx9

    zx9 Member

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    The big question is. Will it be 'The Fabulous Mr. Fox' proof?
     
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  9. Mike B Member

    Messages:
    76
    Location:
    North Wales
    I think I may have to rethink things as you and others have suggested. Maybe just go for careful folds and adhesive, or fabricate a roof out of something thicker. What would be the thinnest stainless that would be weldable with consistent results? Maybe 1.5mm?
     
  10. Mike B Member

    Messages:
    76
    Location:
    North Wales
    certainly will!

    Mail be earthquake proof too looking at my plans!
     
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  11. slim_boy_fat

    slim_boy_fat Forum Supporter

    @Mike B Unless you bought your hamster at The Jurassic Park visitors' shop, how big does this creation need to be? :scared:
     
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  12. Mike B Member

    Messages:
    76
    Location:
    North Wales
    I totally admit that this is overkill, but I want it to be stood strong in 30years looking aged but still tough as anything. The idea is that it becomes almost like a piece of fine furniture, that’s why I’m a bit obsessive about it.
     
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  13. premmington

    premmington Member

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    I have seen a rabbit hutch with a lead welded roof with scalloped edges.

    The same chap - had a copper sheet roofed shed - it looked really pretty - the green had run down off it over the years and stained the wood.


    The chap was a specialist roofer and I reckon he was "borrowing stuff" from work sites.
     
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  14. Parm

    Parm I have fun doing stuff

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    Mate that looks better than most new build houses.

    Fit a fridge, sort out some Leccy and organise some WiFi, I’ll be moving in as soon as it’s done
     
  15. Brad93

    Brad93 M J B Engineering

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    Why not use lead?
     
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  16. premmington

    premmington Member

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    Lead is a far better idea...

    (They have been making odd shaped roofs with it for hundreds of years).

    You can do it without welding - bossing over the batterns - cold forming - (troughs and caps to keep it water tight).
     
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  17. Parm

    Parm I have fun doing stuff

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    Best idea so far, But he will have to go back to the drawing board and consult the structural engineer to ensure the structure can bear the load
     
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  18. Mike B Member

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    76
    Location:
    North Wales
    I prefer the look of the stainless steel over lead. Other choice was zinc. I'll have to have a think about which direction to take this:
    A- continue with ply and stainless, but ned the stainless and bond it where required
    B- go for a heavier duty sheet and have it welded the way I envisaged, but with no inner woodwork, or with woodwork that can be fitted later.
     
  19. premmington

    premmington Member

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    I have seen the hard wood jointed structure above - it will take the load I am sure!
     
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  20. Mike B Member

    Messages:
    76
    Location:
    North Wales
    Screenshot 2019-10-08 at 22.50.42.png Screenshot 2019-10-08 at 22.50.19.png
     
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