Friction stir welding equipment with movable gantry

The invention discloses movable gantry friction stir welding equipment and relates to the technical field of welding equipment.The movable gantry friction stir welding equipment comprises a workbench, a portal frame and a machine head assembly, the portal frame is fixedly installed at the top of one end of the workbench, a sliding saddle is arranged on the front side of the portal frame, and the machine head assembly is installed on the sliding saddle on the front side of the portal frame; a stirring head atomization cooling system is arranged at the bottom of the machine head assembly, X-axis driving systems are arranged on the two sides of the workbench, a Y-axis driving system is arranged in the portal frame, a Z-axis driving system is arranged in the sliding saddle, and a control system operation screen and a lubricating system are arranged on the portal frame. The machine head assembly comprises a machine head box body, a main shaft servo motor, a C-axis servo motor, a C-axis speed reducer, a mechanical