Aluminum is one of the most convenient materials in the design practice. A little inferior to the strength of steel, it is much easier to handle, has good electrical and thermal conductivity, beautiful appearance
However, the main problem that arises with fans when working with aluminum is its soldering. Just so aluminum is not soldered. The reason for the impossibility of soldering aluminum by the usual methods is the ability in the air to form oxide films very quickly (in a fraction of a second). Therefore, previously developed technologies require either special mercury fluxes or special replaceable soldering tips.
Most often, the need for soldering aluminum occurs when repairing resonant voltage regulators. With a view of the economy, all windings of industrial network stabilizers are made by an aluminum wire. It is not necessary to solder these wires themselves. It is enough to fasten a well-soldered wire to them in any convenient way for you and solder not aluminum, but this wire.
But how to be, if it is necessary to solder not conductors, but for example, the most uncomfortable flat surfaces for soldering?
The proposed method is carried out using conventional solder and rosin by a conventional soldering iron. Since aluminum conducts heat very well, the soldering iron is better to take a powerful 60-100 Watt. If the power of your soldering iron is not sufficient to heat up large soldered parts, use additional parallel heating with a gas or electric cooker.
Before joining, the place of soldering should be carefully rubbed with any crumbling stone (sandstone, brick, the piece of dried mortar containing sand, etc.). The stone cleans the surface of aluminum from a thick oxide film. Sand and dust formed during the stripping process must be left in place of the soldering. Immediately after rubbing, the surface of aluminum is covered with a layer of molten resin.
Further, the soldering technique differs little from the soldering of conventional materials, except that now the soldering tip needs to be carefully cleaned with a soldering iron to break with the aid of sand a thin film of oxides that have formed on the cleaned surface before applying rosin.
The strength of the welded aluminum is higher than the strength of the brazed copper. This is explained by the low melting point of aluminum (much lower than that of copper), as well as the high ability of aluminum to diffuse into other metals.
Among all the methods of soldering aluminum known to me, this method is the simplest, the cheapest and the most convenient. It is also suitable for soldering any other metals.
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