Automatic composite welding equipment and method for butt joint between metal circular rings

An automatic composite welding device and method for butt joint between metal rings comprises an annular rail, a sliding seat is installed on the annular rail in a sliding and limiting mode, a driving device is installed on the sliding seat, the driving device is matched with the annular rail to enable the sliding seat to do circular motion along the annular rail, and a sliding seat mechanism is further installed on the sliding seat. A longitudinal mounting plate is mounted at the front end of the sliding seat mechanism, a laser-arc hybrid welding device is mounted on the mounting plate and used for welding the metal rings, and a wire feeding mechanism used for feeding wires to the laser-arc hybrid welding device is further mounted on the sliding seat; and the control system is used for controlling the driving device, the sliding seat mechanism, the wire feeding mechanism and the laser-arc hybrid welding device to automatically operate. Automatic composite welding between metal rings can be automatically comp