波形控制功率负反馈YAG激光焊接机的设计

Design of YAG laser welders controlled with pulse wave shaping and laser power feedback

为了提高激光焊接机激光输出的能量稳定度,采用了在输出端加激光功率检测装置并将其实时信号反馈到控制端,形成一个闭环控制系统的控制方法,进一步提出了在激光功率负反馈信号中加入相位补偿信号以达到提高激光能量控制精度的目的。同时,在激光焊接机软件设计上加入了激光能量波形控制功能,以拓宽激光焊接加工的应用领域。与传统的激光电流负反馈的能量波动为8%以上相比,采用功率负反馈可使激光能量波动控制在3%以内。实验结果表明,选择激光功率波形,可以改善焊接质量。

In order to improve the stability of the output power of the laser welder,a rear optical detector was installed to feedback the output laser power signal to the control unit,making a closed loop control system. Also,a phase compensation signal was added to the laser power signal to increase the control accuracy. In addition, the control function of pulse wave shaping was used to extend the application of the laser welder. Experiments showed that the laser power fluctuation was less than 3%. Compared with 8% laser power fluctuation of the traditional laser welder, the control accuracy was improved greatly. The actual welding experiment has verified that the welding quality can be improved by changing the waveform of the laser power.