Rotary positioning projection welding tool with quick change function

The utility model provides a quick-change rotary positioning projection welding tool which comprises an upper electrode, a lower electrode, a rotary positioning mechanism, a positioning mechanism, a lower electrode copper plate installed on a lower platform of a projection welding machine and an upper motor copper plate installed on an upper platform of the projection welding machine. The rotary positioning mechanism comprises a quick clamp, a fork-shaped positioning block used for positioning the placement direction of the nut is arranged at the overturning end of the quick clamp, and the positioning mechanism is matched with the lower electrode to position the sheet metal part; the upper motor is installed on the lower side of the upper motor copper plate, and the lower electrode is installed on the upper side of the upper motor copper plate. According to the projection welding tool with the quick-change rotary positioning function, the position of a nut can be quickly positioned through the fork-shaped pos