Flange structure of water heater water tank

The utility model relates to a flange structure which is connected on a water tank opening of a water heater, which is characterized in that the flange is provided with an inner side wall and an external side wall, a U-shaped groove is arranged between the inner side wall and the external side wall, the top of the inner side wall of the U-shaped groove is flanged inwards and forms a circular flat surface, the opening of the water tank is flanged outwards and forms a sealing surface, the flange circular flat surface is pressed and fixed, and the external side wall of the U-shaped groove is convexly welded with a steel plate of the water tank body. The utility model has the advantages that since the sealing surface is supplied by the flat surface which is formed by the flanging technique of the water tank opening, hot water in the water tank can not contact with the flange basic body, the U-shaped groove of the flange plays the double strengthening function, the thickness of the steel plate can be the same with