DIY Brazing

Discussion in 'Mech Tech' started by Zed, Jun 11, 2020.

  1. Zed

    Zed Gradually getting grumpier

    Is it possible with a plumber's style (butane?) canister torch?

    I think I know the answer to this one. :(
     
  2. When we were taught brazing at school, we used the acetylene torch. Probably wouldn't be allowed nowadays.
     
  3. Merlin Cat

    Merlin Cat Moderator

    I would say not. I could silver solder braze with Mapp gas if I was indoors or no breeze. I then bought one of those little mix of gas and oxygen things which was better. This was in Spain.

    I’m not very good at brazing tho, I can’t seem to work out the correct amount of heat to apply to make it run nicely and not get over heated!
     
  4. Faust

    Faust Supporter

    What are you brazing ?
     
    Moons likes this.
  5. Nothing, he only has a plumbers torch :)
     
    Suss, snotty, Poptop2 and 3 others like this.
  6. Zed

    Zed Gradually getting grumpier

    Mick's right, too much mass in one of the parts. Back to plan A or plan B.
     
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  8. Zed

    Zed Gradually getting grumpier

    :p
     
  9. mikedjames

    mikedjames Supporter

    I think MAPP gas is hot enough, the usual butane I think is a bit of a struggle.

    All the cool kids use TIG and silicon bronze brazing wire.
     
  10. I've brazed stuff with Mapp gas, but everything will get red hot as the flame isn't as focused or as hot as an acetelyene set up. I bazed a brass plug for a temperature sender into a sump, but just about got it done as the plug was starting to melt:eek:. As @Merlin Cat says no breeze, I've also used some old ceramic heat resistant plates (from a oil fired range) to try and trap the heat. oh and a bit of flux.:)
     
    Merlin Cat likes this.
  11. Zed

    Zed Gradually getting grumpier

    Not doing it now chaps, it's a part I could ruin trying to improve it and I find I had it powder coated too so don't want to spoil that. :)
     
    Merlin Cat likes this.
  12. Merlin Cat

    Merlin Cat Moderator

    My most annoying thing @Surfari was working on a braze put in the country with my final elbow. It got over hot dropped on the floor then I accidentally trod on it and as it was so hot it squashed flat!!
     
    Surfari likes this.
  13. docjohn

    docjohn Supporter

    Yes and no, it just depends on how big the thing it you are trying to braze and how well you can insulate it. You've got to put heat in faster than it escapes to get to the temperature that the brazing/silver soldering rod will melt and run in the place that you want it to. It's certainly easier with oxy/acetylene or oxy/gas torches but possible with straight propane if it's not too big.
     
    Surfari likes this.
  14. docjohn

    docjohn Supporter

    Yes, that works fine, I've also had success with MIG braze - put a plate in the side of a postwar Bentley block with MIG braze.....
     
    DubCat likes this.
  15. Have you been drinking o_O?
     
    Merlin Cat likes this.

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