Semi-automatic device for friction stir welding of large aircraft floor assembly

The invention discloses a semi-automatic device for friction stir welding of a large aircraft floor assembly, which belongs to the technical field of mechanical manufacturing process equipment. The semi-automatic device comprises a basic worktable and a multi-degree-of-freedom turnover support arm. According to the semi-automatic device, the defects of processing capability and technical means of existing equipment can be overcome, a set of brand new process equipment is provided, a basic workbench for friction stir welding is constructed, and a semi-automatic positioning and clamping system is designed. The air cylinders of various specifications are adopted, traditional pin and bolt positioning and clamping are replaced, positioning and clamping of a welded workpiece are simple and rapid, meanwhile, a pneumatic clamping mode and a mechanical clamping mode are provided, risks in the welding operation process are reduced, and labor intensity is relieved. Manual operation is partially replaced by precisely con