Automatic welding assembly line of welding frame or box body assembly and operation method

The invention discloses an automatic welding assembly line of a welding frame or a box assembly and an operation method, and relates to the technical field of welding tools. The device comprises a tool storage frame, a closed protection room, a public bottom plate, a welding robot, a double-shaft positioner, a movable centering device, an electric hydraulic stacker and a piano-type operation table. The tool storage rack is used for storing special welding tools; the closed protective house is provided with entrances and exits; an electric roller shutter door is arranged at the entrance/exit; the public bottom plate is horizontally fixed in the closed protective room; the welding robot, the double-shaft position changing machine and the movable centering device are all arranged on the upper surface of the public bottom plate. The movable centering device corresponds to the double-shaft position changing machine in position; the electric hydraulic stacker carries a special welding tool; the piano-type operation