Page 20 - Curriculum Visions Dynamic Book

Properties of aluminium
Aluminium is soft and easy to shape but will become harder if it is cold-worked by, for example, hammering or pressing. This is called annealing.
The other important property of aluminium is
that it can be welded, using a very high temperature source such as an arc-welding machine and a stick of aluminium. Aluminium can also be brazed
(high temperature soldering using a rod of brass)
or soldered with other metals (although the soldered joints suffer corrosion, making them unsuited for some uses). Aluminium can also be made harder when formed as an alloy.
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 Aluminium is being extruded (pushed through
a press containing a specially shaped die) to create the intricate shapes needed for the building industry. This is cladding.