How to Braze

This is my instructional video on how to braze two copper wires together. This is used when you want to create strong joints. An example on a use of this skill is Phil B's Instructable on a Cut Nail Jerusalem Pectoral.

All that is required is a blow torch, a brazing rod (which can be found at any local hardware store), a brick, needle nose pliers and some 20 or so gauge solid core wire.

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    27 Discussions


    5 years ago on Introduction

    Thank you! i really enjoyed your video. thank you for taking the time to help others out. :



    Reply 7 years ago on Introduction

    Soldering and brazing are very similar, however brazing is defined as a group of joining processes that produce coalescence of materials by heating them to the brazing temperature and by using a filler metal (solder) having a liquidus above 840°F (450°C), and below the solidus of the base metals. The rods I used had a melting temperature of above 450 degrees C and i did not melt the base metal so it is brazing.


    Um slightly incorrect there my dear friend

    Soldering: is a way to join two pieces of metal (normally copper) together by wrapping them in the solder (A mix of tin and lead) this is mainly used for electrical connections as its a good conductor and can be done using a propane torch or a soldering iron

    Brazing: is a way two join two pieces of metal together by heating two parent metals up till they almost melt and adding a bonding metal into them (A Brass filler rod) this is used when welding isn't possible its also more decorative and requires a Oxy Torch to work

    Silver soldering: Not to be confused with soldering is a form or joining two parent metals together. it is very similar to brazing except for a few differences like the filler rod is silver not brass and it welds at a lower temperature but it doesn't bond with the parent metals

    This is pure nitpicking because different people use the terms 'brazing' and 'soldering' differently.

    But the matter is easily reduced.

    There are only two mechanisms (not to be confused with methods) for joining two or more pieces of metal into a single piece of metal. As opposed to mechanical joining methods like screws and rivets. There is 'welding' and there is 'soldering'.

    Welding brings some portion of the pieces being joined above their melting point so that they flow together and cool into a single piece. A filler material may be used, but in this context it is never called solder.

    Soldering brings the surface temperature of the pieces being joined above the temperature needed for them to alloy with the solder metal. This temperature is always above the melting point of the solder but still below the melting point of the pieces being joined.

    Soldering, even electricians solder on a circuit board, creates a metallurgical connection. Solder a pair of twisted copper wires with 50-50 lead-tin and where the two wires meet there is now a thin layer of an alloy consisting of lead, tin, and copper. A kind of bronze perhaps. This is why de-soldering usually takes more heat than soldering, the alloy that is now bonding the metals together has a higher melting point than the solder did.

    Brazing is soldering; a subset of it. The mechanic of the joint (the layer of alloy between the base metals) is identical to every other kind of soldering. It is set apart to a degree to specify high heat like would be needed if your 'solder' were made out of brass. Brazing can use any metal as a filler that melts below the melting point of the base metals and will alloy with those metals at that temperature. I use bronze brazing rods almost exclusively for mending cast iron.

    Silver-soldering is brazing, which is soldering. My favorite brazing method employs Stay-Silv 5. It is 5% silver 94.5% copper and .5% phosphor. It melts at 1600F and it is called solder right on the package.

    So lets focus on the issues instead of the nomenclature. What solder did you use in this video?


    8 years ago on Introduction

    Hey - this is instructables, not brazing for infants.  If someone wants to braze in bare feet, he's an an adult.  Burning your toes with spattered braze isn't going to kill, you, at worst it may be educational.  Big deal.  I think that in the spirit of the thing we should try not to make safety comments just to be like our mothers, or because we have nothing real to say - if you want to post an instructable on safety that would be good, but it should probably have more meat in it than, "Wear shoes."
      On a more Instructable note, presumably brazing didn't originally require custom made rods - can you just use a chunk of brass?  I need to make one small joint and don't really feel like driving five miles to buy supplies.

    3 replies

    Reply 8 years ago on Introduction

    Brazing was originally done in ovens with copper that melted into a joint as it baked.  Today brazing rods are commonly made of combination with 3 or more filler metals.  Brass (which is a combination of copper and zinc) is sometimes used for brazing.  The custom rods are made of very exact combination of filler metals to melt at certain temperatures.  It depends on your base metal whether or not you will be able to braze with brass.  Brass melts at about 900-940 degrees Celsius.  Brazing with commercial rods normally takes place at around 840- 900.  So it has a chance at working but you may not have the strongest joint due to weakening of the base metal from the higher heat needed.  With your own rod you have to be sure that there is no oxidation on your metals.  Hope this helped


    9 years ago on Introduction

    watch heating stuff with a torch on a regular brick or concrete, it will pop and send chunks flying at you sometimes. Not as likely with propane as with oxy-acetylene though.

    2 replies

    Reply 9 years ago on Introduction

    I have had it happen with concrete but never with a brick when using a propane torch.

    i will claim it is from the picture at the beginning. The instructables people are not really awful about being exactly 30 seconds. Sure i could have sped it up a little and made it but it would have lost some of the clarity.

    Right, but I am one of the Instructables people. You could easily trim a few seconds there and be just as clear.