Groove rod positioning device and stator core welding tool

The utility model discloses a groove rod positioning device and a stator iron core welding tool. The groove rod positioning device comprises a groove rod locking mechanism and a positioning groove rod, the locking mechanism comprises a mandrel fixing plate, a plurality of sliding blocks and a limiting outer ring, the sliding blocks and the limiting outer ring are arranged on the mandrel fixing plate, reset springs are arranged on the two sides of each sliding block, and the limiting outer ring is arranged on the mandrel fixing plate. The bottom of the sliding block makes contact with an inner sliding groove of the limiting outer ring, in the working process, the limiting outer ring is rotated, the sliding block is pushed to move towards the interior of the ring through the sliding groove, and the positioning groove rod and the groove rod locking mechanism are fixed through the concave portion of the positioning groove rod. The positioning groove bar in the groove bar positioning device can be automatically se