Aluminium Brazing With Induction Heating

 

Special induction heating units have enabled the brazing of aluminium parts with high reliability and repeatability. The following report describes the special nature of these induction units which also allows the soldering of copper or, with special solder, the realisation of the connection of aluminium and copper parts

Previous aluminium brazing processes were very problematical because of the special properties of aluminium. When heated, the surface of the material is getting a thin oxide layer (Al2O3) immediately with the heating in normal atmosphere. The oxide layer prevents the solder to effect the joining between the aluminium parts, which shall be soldered. This problem can be solved by using an apropriate soldering fluid which prevents the formation of the oxide at higher temperatures. This fluid should be very aggressive at the mentioned high temperatures in order to prevent the oxide forming. The second problem is caused by the aluminium properties at the temperatures near the melting point. Aluminium is getting very soft at these temperatures and can not bear any stress. The soldering material should have its melting point near the melting point of the original aluminium parts. This means, that it is necessary to apply a very precise temperature control in order to achieve a proper aluminium brazing process.

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