Flux for soft soldering of aluminumAluminum soldering is a rather complex task due to the fact that surface of this metal is covered with thin, flexible and very durable film of oxide Al2O3. If, for example, the film is removed mechanically using needle file, then oxide film covers just cleaned aluminum surface immediately after contact with air or water.Conventional fluxes do not dissolve oxide. Special active fluxes are more reliable to remove oxide film.Let's examine one such special fluxes using example of flux, which is called flux for soldering aluminum. Operating temperature ranges from 250 to 360 C.Flux is used mainly with tin-lead group solders. When performing soldering, either brazing or tin, flux easily copes with oxide film. Moreover it in in fact clears the surface and improves spreading of solder and, consequently, increases durability and density of metals connections.If necessary, flux can be cleaned, for example, with alcohol, acetone or special washout flu! id. It is also worth noting that in addition to soldering aluminum and its alloys, flux can be used to braze stainless steels, nickel, copper and various other metals.Thus flux is universal. It is easy to obtain reliable and stable compounds using it.