Double-stirring-head collaborative welding device and welding method for two-piece type hub

The invention designs a double-stirring-head collaborative welding device for a two-piece type hub and a welding method. The hub welding tool, the gantry type welding machine and the mechanical arm welding machine are arranged, the two-piece hub to be welded is clamped and fixed through one tool, the gantry type welding machine and the mechanical arm welding machine are made to conduct collaborative welding on inner and outer ring welding seams of the hub on a single station at the same time, welding of the inner and outer ring welding seams can be completed at the same time at a time, and the welding efficiency is improved. Sequence turning is not needed, the welding efficiency is improved by more than one time, the problem that the hub deformation amount is increased due to disassembly and refixing in the sequence turning process is solved, and the welding quality is improved. Only one set of tool is used for completing welding of inner and outer ring welding seams of the hub on a single station, so that th