How can I connect two aluminium tubes?
Hydro Aluminium Precision Tubing: Connecting two aluminium tubes can be done either mechanically or by soldering or brazing. The method depends on your own needs and requirements. Mechanical connectors are fast and easy to apply, but will not be valid for higher burst requirements. Soldering and brazing forms a metallic bond but requires accessibility to flame brazing equipment in order to melt the filler material.

How do I connect aluminium tubes with copper tubes?
Hydro Aluminium Precision Tubing: Connecting an aluminium tube with a copper tube can be done mechanically or by soldering. The method depends on your own needs and requirements. Mechanical connectors are fast and easy to apply, but will not be valid for higher burst requirements. Soldering forms a metallic bond, but requires accessibility to flame brazing equipment in order to melt the filler material. Brazing can also be done, but this requires stricter temperature control when flame brazing