Function and equipment requirements of welding robot

In order to ensure the welding quality, the basic requirements must be met. For example, the automatic welding robot must not only have sufficient load capacity, but also have a fast speed when shifting between points, smooth movements, and accurate positioning to reduce Shift time, improve work efficiency.

 In the actual welding process, the load capacity of the automatic welding robot depends mainly 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, on the one hand, this kind of welding tongs has a long secondary cable and high power loss, which is not conducive to the robot extending the welding tongs into the workpiece for welding; on the other hand, the cable keeps swinging with the movement of the robot, and the cable is damaged quickly. Therefore, the integrated welding gun gradually replaced it.

Taking into account that the automatic welding robot must have sufficient load capacity to send the welding tongs to the space position for welding at a large acceleration, a heavy-duty robot with a load of 100 to 150 kg is generally selected. In order to meet the requirement of short-distance rapid displacement of welding guns during continuous spot welding, some heavy-duty robots have added a function that can complete a 50mm displacement in 0.3s, which also improves the performance of the motor, the calculation speed of the microcomputer and the algorithm. High demands.

Since the automatic welding robot uses an integrated welding tongs and the welding transformer is installed behind the welding tongs, the transformer must be as small as possible. For transformers with smaller capacity, 50Hz power frequency AC can be used, and for transformers with larger capacity, inverter technology has been used to change 50Hz power frequency AC into 600-700Hz AC, so that the volume of the transformer is reduced and lightened.

In addition, the welding tongs of automatic welding robots usually use pneumatic welding tongs. The opening between the two electrodes of the pneumatic welding tongs is generally only two-stage stroke; and once the electrode pressure is set, it cannot be changed at will, which helps to improve spot welding. quality.