Error Analysis of 6-DOF Welding Robot

Welding robot has the advantages that welding quality stability, high efficiency, improving the working conditions of workers, and it is widely applied in the manufacturing sector. A six degree of freedom welding robot configuration is presented in this paper. The kinematics model of the robot is established by DH method and its kinematics was analyzed. At last the error model of the position-pose of the robot end-effecter, produced by the influence of robot joint movement variables deviation and structure deviation, was established by the differential method. The deviation influence on the end-effecter was analyzed by numerical simulation. The results prove the error model is right, and they will provide a reliable basis for robot position error compensation and accuracy optimum design.