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Brazing and soldering can be carried out manually or by an automated technique. Manual aluminium brazing can be difficult as there is no observable colour change before melting. As with other techniques, aluminium's strong oxide can prevent proper bonding. Strong acids and bases can be used to weaken the oxide, or aggressive fluxes may be used ...
Brazing practice. Brazing is a metal-joining process in which two or more metal items are joined by melting and flowing a filler metal into the joint, with the filler metal having a lower melting point than the adjoining metal. Brazing differs from welding in that it does not involve melting the work
Ductile copper-copper joints. Used on electrical assemblies, e.g. motors or contacts. Used in refrigeration and air conditioning systems, and brass and copper pipe fitting. More fluid than BCuP-3 due to higher phosphorus content. Mutually soluble with copper and copper alloys. Strong tendency to liquate. Available also in strip and sheet form.
Take care to remove flux residues. Brazing alloys are used for joining materials by brazing. Care has to be taken while choosing the alloys, as some elements tend to outgas. Cadmium and zinc are the worst common offenders. Silver, a common component of brazing alloys, can be problematic at higher temperatures and lower pressures.
Fluxes containing halides and mineral acids are highly corrosive and require thorough removal. Some fluxes, especially those based on borax used for brazing, form very hard glass-like coatings that are difficult to remove. Cleanability – the difficulty of removal of flux and its residues after the soldering operation. Fluxes with higher ...
Aluminium bronzes are most valued for their higher strength and corrosion resistance as compared to other bronze alloys. These alloys are tarnish-resistant and show low rates of corrosion in atmospheric conditions, low oxidation rates at high temperatures, and low reactivity with sulfurous compounds and other exhaust products of combustion.