Water heater double-liner through composite flexible connection tool and process

The invention relates to a water heater double-liner through composite flexible connection tool and process. The tool comprises a transition shaft, a tool connecting plate and a set screw. During welding, the tool is adopted, two sets of inner flanges and outer flanges of the upper inner container and the lower inner container of the water heater are centered, positioned and welded, namely the shaft heads of the two transition shafts of the tool are matched with the inner diameters of the two outer flanges of the lower inner container of the water heater, the end holes of the two transition shafts of the tool are matched with the outer diameters of the two inner flanges of the upper inner container of the water heater, and the tool is removed after a welding seam is cooled to the normal temperature after welding. The upper inner container and the lower inner container are enamel, the two sets of inner flanges and outer flanges between the two inner containers are in through composite flexible connection, the