来源：http://www.bellaspire.com/ 发布时间：2022-05-17 浏览次数：
In many welding methods, spot welding only needs point position control, and there are no strict requirements for the moving track of welding tongs between points. Therefore, the requirements for spot welding robots are not very high, which is one of the reasons why spot welding robots are applied earlier.
However, in order to ensure the welding quality, the basic requirements should be met. For example, the spot welding robot should not only have sufficient load capacity, but also have fast speed, stable action and accurate positioning when shifting between points, so as to reduce the shift time and improve the work efficiency.
In the actual welding process, the load capacity of the spot welding robot mainly depends on the form of welding tongs used. For the welding tongs separated from the transformer, a robot with a load of 30 ~ 45kg is enough. However, on the one hand, due to the long secondary cable and large power loss, this welding clamp is not conducive to the robot extending the welding clamp into the workpiece for welding; On the other hand, the cable keeps swinging with the movement of the robot, and the cable is damaged faster. Therefore, the integrated welding tongs will gradually replace them.
Considering that the spot welding robot must have enough load capacity to send the welding tongs to the spatial position for welding with a large acceleration, the heavy robot with a load of 100 ~ 150kg is generally selected. In order to meet the requirements of short-distance and rapid displacement of welding tongs during continuous spot welding, some heavy-duty robots have added the function of completing 50mm displacement in 0.3s, which also puts forward higher requirements for the performance of the motor, the operation speed and algorithm of the microcomputer.
Since the spot welding robot adopts an integrated welding clamp and the welding transformer is installed behind the welding clamp, the transformer must be miniaturized as much as possible. For transformers with small capacity, 50Hz power frequency AC can be used, while for transformers with large capacity, inverter technology has been used to change 50Hz power frequency AC into 600 ~ 700Hz AC, so as to reduce and reduce the volume of transformers.
In addition, the welding tongs of spot welding robot usually use pneumatic welding tongs, and the opening between the two electrodes of pneumatic welding tongs is generally only two-stage stroke; Moreover, once the electrode pressure is set, it can not be changed at will, which is helpful to improve the quality of spot welding.
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