copper wire welding????? or brazing

Discussion in 'Fettling Forum' started by Bruce Kuda, Jul 30, 2020.

  1. Bruce Kuda

    Bruce Kuda United States Subscriber

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    Is this a secret that everyone knew about but me????

    In fabricating my 316T intake manifold there are two steel parts that needed to be joined. I tried solder but the heat would just melt it after a while-- then I tried brazing , it held them together but the amount of heat needed could cause distortion, then I tried just steel wire welding which worked very well but there was a lot of clean up to make it look good----- then a light went on in my head- I remembered that Coleman just used a copper ring to fuse the filler plug to the font--- so I stripped some copper wire applied heat and it flowed just right with out distorting the parts from heat-- WOW I never knew you could use copper to "weld.or braze"--
     
  2. Kiwi

    Kiwi Subscriber

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    Sounds like a great discovery, so did you wrap it around the joint first? If you could post some pictures it would be appreciated.
     
  3. MYN

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    I'd believe its more a braze than a weld if you're talking about copper and steel. It could also be some bronze brazing alloys instead of pure copper. Colour-wise, they might appear a lot like copper but they'll melt at a lower temperature.
    What equipment are you using to weld and braze them? Gas(propane/MAPP), oxy-acetylene or oxy-Lpg, etc, electric?
     
  4. podbros

    podbros United Kingdom Subscriber

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    You can weld copper alright...

    Still used extensively in refrigeration manufacturing.

    Oxy/ Acetylene was the medium with a suitable flux and Copper filler wire.

    Brazing or Braze-welding are more descriptive terms...

    Brazing is where you flow the filler metal in and underneath the two materials, using capillary action.

    Braze-welding is where the filler metal is built up to act as an extra structural join, such as a 'Fillet Weld'

    (if you look up Fillet Weld on Wiki, you'll see what i mean?)

    Hope this helps....
     
  5. Bruce Kuda

    Bruce Kuda United States Subscriber

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    I used oxy -acytelen with a very low flame-- when both pieces of steel just started to show red I touched them with the copper--- I was just using regular solid copper wire with the insulation stripped off--the copper liquefied and flowed nicely ~~ the first couple I polished up the surfaces-- but today I did a couple with out cleaning and they worked just as well-- maybe tomorrow-- I'll try it using just Mapp gas and see if that will generate enough heat-- If I get caught up on orders I may post a quick video--
     
  6. MYN

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    I don't think MAPP's going to get the copper hot enough to melt and flow as easily as oxy-acetylene. Perhaps it might not at all unless its large enough to make the steel bright red/orange. Or if the copper wire is small enough. Some Borax flux might help to some extents to retain some heat other than preventing the molten copper from oxidizing.
     
  7. Thomas

    Thomas Subscriber

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    Have you ever tried Sil-Fos? It flows nice and they sell a powdered flux that really makes a nice joint.
     
  8. Bruce Kuda

    Bruce Kuda United States Subscriber

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    I just googled it-- looks good but here its pretty darn pricey-- 75 bucks for a one pond package of rods-- YIKES~~~!!!
     

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