An electrode tip assembly of spot welder

The utility model discloses an electrode tip assembly of a spot welding machine. The utility model belongs to the technical field of welding, the device comprises an electrode holder, a connecting seat and a welding head, the connecting seat is fixedly connected to the upper end of the electrode holder; a mounting hole is formed in the end surface of the connecting seat; the welding head is detachably mounted at the lower end of the electrode holder and is in threaded connection with the electrode holder; a groove is formed in the welding head; a mounting frame is fixed in the groove; a limiting tongue moving up and down is movably mounted in the mounting frame, the tail of the limiting tongue is connected with the mounting frame through a spring, a spiral cooling water channel is formed in the electrode holder, a water inlet is formed in the side wall of the electrode holder at the lower end of the cooling water channel, and a water outlet is formed in the side wall of the electrode holder at the upper end o