aluminium metal is a little tricky to solder.
you need to tig weld aluminum. solder doesnt possess much integrty if theres any pressure added to the piece it will break.
You need a low temp solder because aluminum conducts heat away rapidly
Aluminum oxidizes rapidly and the oxide adherers to the surface. When you try to solder it, the heat causes rapid oxidation which creates a barrier preventing the solder from adhering to the metal. Aluminum can be soldered in an inert atmosphere.
