Workpiece clamping jig for welding machining

The utility model discloses a workpiece clamping jig for welding processing, which comprises a bottom plate and a base plate arranged on the upper surface of the bottom plate, the base plate is used for welding a metal sheet to a cylindrical workpiece, and the metal sheet further comprises a body part and an extension part which are connected with the upper surface of the cylindrical workpiece in a welding mode. A positioning base is fixedly installed on the upper surface of the base plate, an arc-shaped groove matched with the side surface of the cylindrical workpiece is formed in the corner of the positioning base, a clamping block is arranged on the outer side of the positioning base, and a clamping groove is formed in the side surface, close to the arc-shaped groove, of the clamping block; a supporting block is arranged on the outer side of a clamping area defined by the clamping groove and the arc-shaped groove. According to the utility model, when a workpiece to be welded is clamped and positioned, a me