Soldering of aluminum

In the manufacture of household appliances, aluminum and its alloys: silumin, duralumin - are used very widely. Of these materials, both product cases and wires for various devices are performed.

What to do if there is a need to solder the aluminum part or solder the fallen wire from this light material? Soldering metals in general, and aluminum in particular - is, as a rule, a non-trivial task that requires knowledge and experience. Both aluminum itself and alloys with its participation have an unpleasant property. Under the influence of atmospheric oxygen, details of this metal are covered with a strong oxide film, because of which the soldering of aluminum becomes a difficult task. After all, oxide prevents reliable connection of soldered parts. In this material you will be able to read about how soldering of aluminum at home is carried out with solder, which includes lead: POS-50, POS-61 and POS-90.

The first way. If you need to solder a pair of wires consisting of aluminum to each other, you must first thoroughly tamp them. On the ends of the soldered wires rosin is applied, a sanding pad of medium numbers is placed from below, and the wire is pressed against this skin with a hot soldering iron (which must also be preliminarily zaludit). In the process you need to constantly add rosin, remove the soldering iron from the metal in no case should not. This operation is repeated many times until the wires can be properly grounded. Then you can start soldering. If instead of rosin use alkaline oil for cleaning weapons or mineral, which is smeared with sewing machines, then the preparation for the process, and the soldering of aluminum itself will not cause difficulties. If, of course, you have at least a little experience in these matters.

The second way. It is good to solder aluminum in sheets. In place of the seam, rosin is applied, into which are cut small metal filings, then on the seam it is necessary to walk several times with a hot-iron soldering iron, constantly adding solder. The meaning of this method is that the sawdust with sharp corners will scratch and rip off the oxide film, and when it does not interfere, the solder tin is well connected to the substrate, and soldering of aluminum becomes a simple task.

The main thing is to remember the rule: the thicker the sheet of aluminum, the more powerful the soldering iron should be. If you are faced with the task of soldering thin sheets, a soldering iron with a power of 50 watts will cope. In the case where the thickness of the sheet is a millimeter or slightly more, you will need a 90 W soldering iron. And if you need to solder aluminum in sheets that consist of plates of two millimeters thick, then before soldering it is necessary to preheat the metal, then apply the flux and then start the sealing process. In the second method, as in the first, it is possible to use mineral oil instead of flux.

The third option. Before proceeding directly to the soldering, it is necessary to perform the procedure of "copper-plating" on the element that you have taken to work. For these purposes, a galvanizing plant is suitable, but if it is not at hand, you can do without it. Start with the application of concentrated copper sulfate to the area of the soldered skin. Then connect the negative lead of the battery or battery to this part. Positive contact lead to a copper wire fixed to the nap of the toothbrush so that it does not touch the surface of aluminum due to the protruding bristle. After a certain time, at the point of the part you are going to solder, a thin layer of copper will be deposited. It must be washed with water, dried, and then zaludit in the standard way (using a soldering iron).