Step-up transformer

Step-down transformer

One-to-one transformer

No transformer

50% copper and 50% zinc

50% copper and 50% lead

50% lead and 50% zinc

50% copper and 50% tin

silver brazing

induction brazing

dip brazing

torch brazing

Because aluminium is too hard

Because aluminium has a too low melting point and would melt before brass

Because aluminium has a too high melting point and will not melt

Because aluminium is non-ferrous metal

Wet and dry silicon carbide paper

Emery cloth

Wire wool

Aluminium oxide paper