Improved steel coil inner ring spot welding machine electrode device

The utility model relates to an improved electrode device of a steel coil inner ring spot welder, which comprises a welding head, a connecting rod and a mounting bottom plate, the lower end of the connecting rod is in taper connection with the mounting bottom plate, the mounting bottom plate is fixedly mounted on a connecting plate at the head of a cylinder rod of a centering cylinder, and the improvement is that the welding head is in taper connection with the connecting rod; the connecting rod is provided with a vertically-through cooling through hole, and the installation bottom plate is provided with a water inlet blind hole, a water return blind hole, a connecting rod installation blind hole and an auxiliary hole which are communicated with one another. The temperature of the welding head of the electrode device of the steel coil inner ring spot welding machine can be effectively reduced, the service life of the welding head is prolonged, the welding quality is improved, and normal production is guarante