FSW lap joint resistance optimization through gradient techniques

In the recent years the scientific interest on Friction Stir Welding (FSW) has grown more and more since such joining technique allows to weld light weight alloys rather difficult to be welded or even “un-weldable” with the classic fusion welding operations. What is more, a few industrial applications of the process are already known in different manufacturing fields. In the paper the optimization problem of a FSW lap joint for automotive applications is investigated taking into account process parameters such as the tool rotating speed and the tool feed rate; a numerical gradient technique is applied for the optimization procedure reducing the number of experimental tests to be developed.