Grader frame structure robotic arm for welding, in the form of robot hoisting and mobile slide, in addition to the general welding robot reliable, accurate and efficient requirements, in the overall framework of the workstation, the mechanical transmission of the equipment, the overall control accuracy, the online control of welding quality, and the coordination with the surrounding equipment and environment, etc. Comprehensive intelligent adjustments have been made. The addition of the robot walking system enables the robot to move on a specific route to complete the welding of the grader frame structure, expanding the robot's operating radius.