采用固体脉冲 Nd:YAG激光器研究脉冲电流、切割速度和氮气压力对壁厚为 1 mm的薄壁不锈钢圆管切割质量的影响。以切缝宽度和切口表面粗糙度作为衡量指标, 通过正交试验得出氮气压力是薄壁不锈钢圆管切割质量的主要影响因素, 其次是脉冲电流, 切割速度对切割质量的影响在三个因素中最小, 其最优工艺参数组合为：脉冲电流 I＝170A, 切割速度 v＝40 mm/min, 氮气压力 P＝0.8 MPa。设计实验所用薄壁不锈钢圆管的专用夹具, 解决了其采用直接装夹方式时装夹变形和定位精度低的问题。

The pulse current, cutting speed and nitrogen pressure, which influence the cutting quality of thin-walled stainless steeltube, have been studied with solid pulse Nd:YAG laser. The cutting quality is measured by the kerf width and surface roughness ofthe incision. The best process parameters have been gained with the orthogonal test. The high quality thin-walled stainless steel tubehas been cut with the pulse current of 170 A, cutting speed of 40 mm/min and nitrogen pressure of 0.8 MPa. Designa special fixtureof thin-walled stainless steel tube to reduce clamping deformation and improve positioning accuracy.