Process manufacture of aluminum alloy structural hardening comprising friction welding tool of at least two elements of the same alloy or of different alloys, characterized by the solution and quenching of weldings, in which the elements are subjected before welding to heat treatment at a temperature T lasting at least 2t1, being t1 defined as the minimum duration of a treatment at temperature T resulting in a specific energy peak fusion, defined by AED, less than 1 J / g.
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