利用热力学方程进行了激光切割AZ31B镁铝合金的仿真实验。激光切割速度为8 mm·s-1时, 试样具有较好的切割质量。开展了光纤激光切割1.0 mm厚AZ31B镁铝合金的工艺实验, 获得了激光功率、切割速度、离焦量对激光切割质量影响的单因素实验数据, 并提出了三因素正交实验方案。1.0 mm厚AZ31B镁铝合金激光切割的优化工艺参数为：激光功率120 W, 切割速度0.5 m·min-1, 离焦量1.2 mm, 与理论计算值基本一致。

The simulation experiment on the laser cutting of the AZ31B magnesium aluminum alloys is conducted based on the thermodynamic equations and it is found that the cutting quality of samples is better when the laser cutting speed is 8 mm·s-1. The process experiment on the laser cutting of the 1.0-mm-thick AZ31B magnesium aluminum alloys is carried out and the single-factor experimental data related to the effects of laser power, cutting speed and defocusing is obtained. The scheme of three-factor orthognal experiment is also proposed. The optimum process parameters for a laser cutting of the 1.0-mm-thick AZ31B magnesium aluminum alloys are a laser power of 120 W, a cutting speed of 0.5 m·min-1, and a defocusing of 1.2 mm, which are basically consistent with the theoretical calculation values.