Soldering aluminum at home. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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1 method. To solder two aluminum wires, they are pre-tinned. To do this, the end of the wire is covered with rosin, placed on a sanding skin (with a medium grain) and pressed with a hot tinned soldering iron to the sanding skin, while the soldering iron is not taken away from the wire and rosin is added to the tinned end all the time. The wire is tinned well, but all operations have to be repeated many times. Then the soldering goes in the usual order.
Better results are obtained if mineral oil for sewing machines or alkaline oil (for cleaning weapons after shooting) is used instead of rosin.
2 method. When soldering sheet aluminum or its alloys, rosin with fine iron filings is applied to the seam with a hot soldering iron. The soldering iron is tinned, and they begin to wipe the seam, adding solder all the time. The sawdust, with its sharp edges, removes the oxide from the surface, and the tin adheres firmly to the aluminum. Solder with a well-heated soldering iron. For soldering thin aluminum, a soldering iron power of 50 W is sufficient, for aluminum with a thickness of 1 mm or more, a power of 90 W is desirable, if the thickness is more than 2 mm, the soldering place must be heated with a soldering iron and only then apply flux and solder. Mineral oil can also be successfully used here as a flux.
3 method. The original way of soldering aluminum wires and aluminum surface. Before soldering, the aluminum surface (wire or plate) is preliminarily copper-plated using a simple electroplating installation. But you can do it easier. The place of soldering is cleaned with a sandpaper and a few drops of a saturated solution of copper sulfate are carefully applied to it. Next, the negative pole of a DC source (rectifier, flashlight battery or battery) is connected to the aluminum part (wire or plate), and a piece of copper wire 1-1,2 mm (without insulation) located in the "device" is connected to the positive pole. , made on the basis of a toothbrush (see Fig. 1).
The copper wire is placed in the bristles of the toothbrush so that the wire does not touch the aluminum surface during bristle friction (copper plating) on the part surface. After some time, a layer of red copper settles on the surface of the aluminum part, which, after washing and drying, is tinned in the usual way (with a soldering iron).
Note
In industry and repair practice, for soldering mounting elements made of aluminum and its alloys, as well as connecting them with copper and other metals, solders of grades P150A, P250A and P300A are used. Soldering is carried out with an ordinary soldering iron, the tip of which is heated to a temperature of 350 ° C, using a flux, which is a mixture of oleic acid and lithium iodide.
Author: Bastanov V.G.; Publication: cxem.net
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