Process for improving strength of friction stir welding (FSM) joint for discontinuously reinforced aluminum (DRA) matrix composites

The invention relates to aluminum matrix composites and the field of welding, specially provides a process for improving the strength of a friction stir welding (FSM) joint for discontinuously reinforced aluminum (DRA) matrix composites, which is suitable for DRA matrix composites capable of being subjected to reinforced heat treatment. The process comprises the following steps: carrying out solution treatment on aluminum matrix composites which can be subjected to reinforced heat treatment; after the quenching operation is performed, carrying out friction stir welding on the obtained object within four hours; and carrying out natural ageing or artificial aging on the obtained weld assembly in the air according to the application demands, or carrying out reinforced heat treatment again onthe weld assembly by using a commonly-used industrial process. By using the welding process provided by the invention, the weldability of DRA matrix composites can be improved obviously, the tool wear can be reduced, and the