Brazing ali

Discussion in 'Tech/Mech General' started by olley, Dec 3, 2009.

  1. olley

    olley Funster

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    Hi amazed to find while looking at ways to weld ali that you can now buy fluxless brazing rods, see here: http://www.aluminiumrepair.co.uk/shop.html

    Didn't realise I was so out of touch, I have only ever gas welded it and that was 35 years ago, looking at the video's on that site it seems pretty straightforward, might buy some and try a few joints on the rotator.

    Olley
     
  2. JJ

    JJ Funster

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    Hi Olley, I do believe you can mig weld it too with the right gun and wire...

    JJ
     
  3. pappajohn

    pappajohn Funster Life Member

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    hi olley,

    i used a similar thing about 10 years ago when doing aeromodelling.

    special aluminium alloy rods, a stainless wire probe and a stainless wire brush.

    using a plumbers blow torch heat the parts to be welded, brush clean then reheat until the workpiece just starts to 'puddle'.
    apply a small amount of filler rod and agitate the puddle with the wire probe while maintaining the puddle with heat.
    allow to cool naturally.

    really difficult as slightly too much heat for too long and you pick up the blobs of ali that were the workpiece...:cry:

    the weld was far, far harder than the original ali and could only just be filed with a regular engineers file.:thumb:
     
  4. olley

    olley Funster

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    Hi JJ you can but TIG is a better method, but the gear you need and the price of it, its not worth it for the Diyer. Brazing is cheap and easy, just use an ordinary blow lamp.

    Hi Papa sounds the same, they claim its stronger than the base metal, now that's what I call progress. :BigGrin:

    Olley
     
  5. pappajohn

    pappajohn Funster Life Member

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    just watched the video and its exactly the same process.

    to repair the broken casting lug shown will use all 5 rods in the kit at least.:Sad:
     
  6. hilldweller

    hilldweller Funster Life Member

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    They make it look *so* easy at exhibitions.

    But in the real world........

    Actually I don't know, I've got MIG so never tried it.
     
  7. johnsandywhite

    johnsandywhite Read Only Funster

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    :Cool: They STILL have a man at the BMFA Nats doing a Demo and selling the special rod by the Metre. :thumb:
     
  8. pappajohn

    pappajohn Funster Life Member

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    by the METER....:Eeek:

    the kit i used was around £15 and had three 6" rods...must cost a fortune for a meter rod. :Sad:
     
  9. hilldweller

    hilldweller Funster Life Member

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    But what a price he was charging. An arm and two legs.
     
  10. American Dream

    American Dream Read Only Funster

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    I have been gasless welding for some 10 years Olley...

    Seems to work well but there is always a price premium for the wire/rods....:thumb:
     
  11. Landy lover

    Landy lover Funster

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    Having had a look I think I will stick with my Mig and a bit of Argon- a lot quicker and easier I reckon
     
  12. hilldweller

    hilldweller Funster Life Member

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    Having said that, they do show repairs to great big castings a MIG would not tackle.

    I hope I never have to find out. Though if a certain person with a stuck sump plug takes some of the advice given they'll be testing it for sure.
     
  13. johnsandywhite

    johnsandywhite Read Only Funster

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    :Laughing: THAT was negotiable depending on the time of the day and what mood he was in. :Rofl1:
     

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