讨论了激光功率控制的必要性，给出了激光功率控制的原理以及一种实现方法。
Discussing the necessary of laser power control in cutting processing. Giving out a method to realize laser power controlling.
控制系统软件设计主要包括主程序、冷却水参数检测子程序、激光功率控制子程序与人机界面子程序等四部分的程序设计。
The control system software contains the main program, the cooling water parameters detection subprogram, the laser power control subprogram, and the human machine interface subprogram.
试验表明：通过调节激光器的输出功率、光斑直径和扫描速度可以方便地控制熔化层深度和表面平整度。
The experimental result shows that the depth of hardened zone and smoothness of surface can be controlled conveniently by varying the power output beam diameter and scanning rate of laser light.
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