Welding fixture for jib truck workpiece

The utility model relates to the technical field of welding fixtures, and discloses a welding fixture for a jib truck workpiece, which comprises a mounting plate, a clamping block arranged in the middle of the mounting plate, limiting blocks arranged on the periphery of the outer wall of the mounting plate, a threaded column arranged on one side wall of the mounting plate, and a moving mechanism arranged on the opposite side wall of the mounting plate. According to the clamping device, a workpiece is manually placed on the clamping block, the workpiece can be located on one side of a fracture surface arranged above the limiting block mounting plate, the first lead screw and the second lead screw are driven to rotate when the handle is rotated by rotating the handle, and due to the fact that the clamping mechanisms are installed on the first lead screw and the second lead screw in a meshed mode, the workpiece can be clamped by the clamping mechanisms. At the moment, the clamping mechanism can move, the freedom