Friction stir welding flexible welding test fixture

A flexible welding test clamp for friction stir welding comprises a base plate, two pressing plates and at least two pressing blocks. The base plate is a rectangular steel plate, a step is arranged on one side of the long edge, a positioning groove is formed in the middle of the step, and two screw holes including a first screw hole and a second screw hole are formed in the base plate steps on the two sides of the positioning groove in a bilateral symmetry mode with the center line of the positioning groove as the center line. Third screw holes are formed in the base plate in a bilateral symmetry mode with respect to the center line of the positioning groove. The two pressing plates are symmetrically arranged on the two sides of the base plate positioning groove and are rectangular, and the middles of the outer side edges of the long sides of the pressing plates are concave inwards to form a rectangular groove. First kidney-shaped holes are formed in the two ends of the pressing plate and connected to the ste