Characteristics Of Welding Robots

Spot welding does not require very high requirements for welding robots. Because spot welding only requires point control, there is no strict requirement for the moving trajectory of the welding clamp between points, which is why the robot can only be used for spot welding at first. The robot for spot welding must not only have sufficient load capacity, but also be fast, stable and accurate in positioning when shifting between points, so as to reduce the shifting time and improve work efficiency. How much load capacity the spot welding robot needs depends on the type of welding clamp used. For welding clamps separated from the transformer, a robot with a load of 30 to 45 kg is sufficient. However, this type of welding clamp is not conducive to the robot extending the welding clamp into the workpiece for welding due to the long secondary cable and large power loss; on the other hand, the cable swings continuously with the movement of the robot, and the cable is damaged quickly. Therefore, the use of integrated welding clamps is gradually increasing. The weight of this welding clamp together with the transformer is about 70 kg. Considering that the robot must have sufficient load capacity and can send the welding clamp to the spatial position for welding with a large acceleration, heavy robots with a load of 100 to 150 kg are generally selected. In order to meet the requirement of short-distance rapid displacement of welding clamps during continuous spot welding, the new heavy-duty robot has been added with the function of completing 50mm displacement within 0.3s. This places higher requirements on the performance of the motor, the computing speed of the microcomputer and the algorithm.