Aluminum alloy double-sided friction stir welding process

The invention relates to the technical field of welding. An aluminum alloy double-sided friction stir welding process comprises the following steps that firstly, two aluminum alloy plates to be welded are conveyed to a welding station through a feeding frame; a first side pushing mechanism and a second side pushing mechanism which are used for gathering two to-be-welded aluminum alloy plates are mounted on the welding station; a first pressing mechanism and a second pressing mechanism are mounted on the welding station; and secondly, a first side pushing mechanism and a second side pushing mechanism work, a first downward pressing mechanism and a second downward pressing mechanism conduct downward pressing, a welding assembly conducts welding work, the two stirring welding heads synchronously operate up and down, and the two to-be-welded aluminum alloy plates are welded to form a first assembly. By means of the method, the flatness of the welded part can be guaranteed to the maximum extent and can be controll