Disc workpiece inner hole positioning clamp

The utility model relates to the technical field of welding clamps, in particular to a disc workpiece inner hole positioning clamp. Comprising a welding table fixedly arranged on the ground; the lower clamping table is fixedly mounted on the welding table; when a workpiece is clamped, the side wall of the lower clamping table abuts against the lower end of the side wall of an inner hole of the workpiece. The lower end of the connecting rod is provided with threads and is in threaded connection with the lower clamping table; a chuck and a through hole are arranged at the upper end of the connecting rod, the chuck extends outwards in the radial direction, and the through hole is formed in the upper end of the chuck. The upper clamping block is arranged on the connecting rod in a sleeving manner; the upper clamping block comprises a pressing plate and an abutting block, and the abutting block is arranged on the bottom face of the pressing plate. When a workpiece is clamped, the pressing plate abuts against the t