A simple way to solder aluminum

This is the incredibly simple way to solder aluminum that you can imagine. With its help, anyone, at home or in the garage, can easily repair and restore any aluminum products, without any argon welding. You can easily make various structures from aluminum profiles and much more.

Now, in order to solder a radiator or an aluminum bicycle frame, you don’t have to go to a workshop and spend a lot of money, everything can be soldered at home.

With the right approach, soldering turns out to be no worse than a welded joint, but certainly more reliable than any cold welding, which is usually used as an alternative.

Will need

A gas burner does not have to be professional. A regular burner attachment for a gas cylinder is sufficient, or any other will do.

I will tell you in more detail about the specialized solder that you will need to purchase. This is a tubular powder solder specifically designed for soldering aluminum (why powder? - powder inside the tube). It consists of two components: a shell and a powder base inside.We won’t go into details about the chemical composition, there’s no need for that.

It can be purchased in specialized stores and is used in car repair shops. The most affordable way for everyone is to buy it at Ali Express - link to solder.

It’s inexpensive, I advise you to buy the package right away - it will definitely come in handy in life.

Soldering aluminum with a gas torch

We take the profile or parts that need to be welded.

Clean the surface with a metal brush. Alternatively, you can use coarse-grain sandpaper. The higher the roughness of the soldering surface, the better the bond with the solder.

We fix the connection with a clamp or other device. Turn on the gas burner and heat the joint.

We bring tubular solder. It melts and spreads along the seam.

The entire process occurs at approximately 450 degrees Celsius.

Solder has incredible fluidity and flows into any, even the smallest, cracks in the metal.

After distributing the solder, we warm up the connection a little more so that it is distributed and spreads out at the joints of the assembly as much as possible.

Let's sum it up

Personally, when I learned about such a simple and accessible soldering method, I was incredibly surprised. I think I managed to surprise you too, if of course you didn’t know about it before.

A few words about reliability. Of course, welding wins, since the structures are combined and mixed, but this method is not much inferior. If the connection bends, the part itself bends. The solder connection is extremely reliable and is quite capable of withstanding almost any load, as if the connection was cast.

The only thing is that if the soldering is not of very high quality, it is most likely that the torch was not heated sufficiently. In other cases, everything holds tight.

Now it won’t be difficult for you to solder a hole in an aluminum pan, make a tank from sheet metal, or make a rack from a profile.

Take the method into service and use it, friends! See you again!

Watch the video

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Comments (40)
  1. W
    #1 W Guests 16 May 2018 17:31
    24
    The seam is somehow overly decorative. It will fall apart under load.
    1. Gsot
      #2 Gsot Guests 22 January 2020 06:58
      5
      Have you even seen it? such a seam to burst!
      The part itself bends, but the seam holds tightly!
  2. Guest Sergey
    #3 Guest Sergey Guests 16 May 2018 19:59
    34
    This is really useful information! Thanks to the author!
  3. Alex Alex
    #4 Alex Alex Guests 17 May 2018 20:21
    12
    Soldering iron of appropriate power (gas torch), regular solder, aspirin tablet as flux.
    Profit!
  4. Guest Sergey
    #5 Guest Sergey Guests 21 May 2018 15:32
    7
    the melting point of aluminum oxide is 1200 g, you will be tired of melting with this burner
    1. kamiram
      #6 kamiram Guests 14 June 2018 22:07
      2
      The combustion flame of pure propane has a temperature of about 2526 °C, and the heat output, on average, is 2110 °C
    2. valentine
      #7 valentine Guests 19 August 2018 18:43
      2
      No one is going to melt aluminum oxides. Flux does this. Our job is to heat the welding or soldering area to the appropriate process temperatures.
    3. Sergei Yurievich Korolev
      #8 Sergei Yurievich Korolev Guests December 28, 2022 08:28
      1
      The melting point of aluminum itself is much lower, so the film must be destroyed before soldering, either mechanically or chemically; here both options are used: first with sandpaper, then with powder flux in the solder. But you still need experience, it didn’t work out for me, out of four joints one is fine, you can tear it off, three fell off on their own.
  5. Peter
    #9 Peter Guests 21 May 2018 15:35
    5
    don't solder silumin like that
    1. Eugene
      #10 Eugene Guests 2 March 2019 14:42
      6
      Does anyone solder silumin? It’s not for nothing that they joke that this is a rare alloy of cardboard and foil
  6. Oleg-sg
    #11 Oleg-sg Guests May 22, 2018 12:13
    4
    Why sand? For adhesion to solder? - mysticism
    1. Guest Vladimir
      #12 Guest Vladimir Guests 23 May 2018 19:46
      4
      to remove large oxide, otherwise heat longer
    2. Guest Mikhail
      #13 Guest Mikhail Guests June 10, 2018 11:42
      6
      To remove the oxide film
      1. Guest Igor
        #14 Guest Igor Guests 28 July 2018 15:34
        6
        The film will instantly appear again. It is for this reason that aluminum is welded ONLY in argon. Argon prevents the formation of an oxide film. Therefore, stripping aluminum is complete nonsense. Chemistry had to be taught at school.
        1. valentine
          #15 valentine Guests 19 August 2018 18:50
          5
          Cleaning the surface of the junction is performed to CLEAN the surface of the junction from contaminants invisible to your naked eye. Believe me, it’s full of all sorts of nasty things that interfere with soldering. But flux cannot cope with all contaminants since we are soldering aluminum, a metal that easily joins joints.
          1. Guest Igor
            #16 Guest Igor Guests 10 September 2018 18:46
            7
            You will NEVER be able to remove the oxide film. It is formed INSTANTLY. This is masturbation.
            To prevent the formation of an oxide film, aluminum is welded in an ARGON environment. No other way.
            1. Bodro
              #17 Bodro Guests 6 September 2019 20:02
              6
              Seriously? Go to a welding course - maybe they will teach you there.
  7. Not a welder
    #18 Not a welder Guests 22 May 2018 18:00
    10
    Soldering is not welding!
  8. Guest Vladimir
    #19 Guest Vladimir Guests 23 May 2018 19:43
    4
    I soldered this myself many times, it holds up perfectly. The solder is called castolin, if I’m not mistaken, there are our analogues. I soldered a radiator, a silumin car mirror and corners, everything holds up
  9. Guest
    #20 Guest Guests 24 May 2018 08:25
    11
    This has been known for a long time. This is how aluminum shells of communication cables have been soldered since the time of the king of peas. The solder was called TsOP "zinc-tin solder".
    1. Alexander
      #21 Alexander Guests 29 May 2018 13:19
      6
      To be honest, I didn’t know this method. Thanks to the author!
    2. Guest Mikhail
      #22 Guest Mikhail Guests June 10, 2018 11:44
      3
      No it's not like that..
    3. Vyacheslav
      #23 Vyacheslav Guests 25 June 2018 22:24
      0
      The technology for working with Dsop or A250 solder (these are analogues) is as follows: the surface is made rough before soldering in order to increase the contact area of ​​the future soldering site and increase the shear resistance, the surface is heated until the Dsop melts and is rubbed with a small layer of solder, then the place is heated further It is wiped with a cotton rag - a thin layer of poluda remains, and then it is soldered with ordinary solder. preferably POS 30 or 40 (they are more flexible), or POS 60 (it is stronger). The main place of soldering is to be protected from moisture - a galvanic couple is obtained and the aluminum turns into a sieve in just a week.
      1. Boris
        #24 Boris Guests November 16, 2019 01:15
        2
        I completely agree with you, I also had to solder communication cables in this way, I just didn’t know that the solder was brand A250, we simply called it solder A.
  10. Nick
    #25 Nick Guests 29 May 2018 14:49
    22
    660 gr. melting point of aluminum. The author indicates the soldering temperature is 450 g. question: HOW? It's simple! "Aluminum powder electrode" is a multicomponent tin-lead-antimony solder with flux for soldering aluminum. hence the author’s reluctance to reveal the secret of the chemical composition of the “aluminum powder electrode”. nope, it solders with a bang, but only the antennas. You can't solder anything serious with this bullshit. only by welding!
    1. Dym
      #26 Dym Guests 9 June 2018 13:36
      4
      Absolutely right! You said what I wanted to say))
    2. Guest Mikhail
      #27 Guest Mikhail Guests June 10, 2018 11:49
      1
      And who knows how to determine whether aluminum has heated up? It doesn’t get red hot, it just starts to drip and flow..
      1. kamiram
        #28 kamiram Guests 14 June 2018 22:09
        5
        There is a very simple way: rub the surface with soap. when the soap turns black, the aluminum is on the verge of melting