Study on brazability of Al-Cu-Si-Ni filler metal at medium-temperature on different parent metal

The vacuum brazability of Al-Cu-Si-Ni filler metal at medium-temperature was studied by using 3A21,6061 and 2A50 aluminum alloys as the parent metal.It was found that the ability of forming sound joint of the filler metal is related with the used parent metal.Al-Cu-Si-Ni filler metal shows better brazability on 2A50 alloy than on 6061 alloy.The result of AES-EDS analysis shows that the difference of brazability of the filler metal is attributed to the different structure of oxide film formed on the parent metal surface during the brazing process.