WELDED STRUCTURAL ELEMENT COMPRISING AT LEAST TWO ALUMINIUM ALLOY PARTS WHICH ARE DIFFERENT FROM ONE ANOTHER OR WHICH HAVE DIFFERENT METALLURGICAL STATES, AND METHOD OF PRODUCING ONE SUCH ELEMENT

摘要

The invention relates to a structural element comprising at least two aluminium alloy parts which have different property trade-offs and which are welded together. According to the invention, at least one of the aforementioned parts is: (i) selected in an aluminium alloy that is different from the other of said at least two parts, and/or (ii) selected in an initial metallurgical state that is different from the other of said at least two parts. Moreover, at least one of the two parts has been pre-tempered prior to welding and the structural element is subjected to post-welding tempering, thereby conferring a final metallurgical state on each of said at least two parts. In addition, the parts are preferably welded by means of friction stir welding. The invention also relates to a method of producing said structural element.