Friction stir welding clamp

The utility model discloses a friction stir welding fixture relates to frock clamp technical field, the friction stir welding fixture includes the work table, the bottom of work table is fixedly connected with the fixed plate, the surface of fixed plate is rotatingly connected with the bidirectional threaded rod, and the bidirectional threaded rod penetrates into the fixed plate, the surface of work table is provided with the limit groove, the limit groove is equipped with the limit screw. According to the friction stir welding clamp, when the clamping blocks move to clamp and fix an aluminum alloy cavity, the aluminum alloy cavity moves towards the center of the workbench under the action of the elastic force of the springs, so that the aluminum alloy cavity is always located at the clamping center point, and the situation that the aluminum alloy cavity moves in a staggered mode during use is avoided; and meanwhile, the device can be adjusted in a self-adaptive mode according to different specifications of t