Experimental Studies On Laser Paint Striping Of High-Speed Railway Carriages

To meet the high efficient and pollution-free paint striping requirement of high-speed railway carriages, a nanosecond fiber laser paint striping experiment is proposed. The influence of the pulse width and the laser power on the paint removed thickness and effect are studied, the paint removal mechanism is analyzed and the paint removal parameters are optimized. The result shows that, the main mechanism of laser paint striping is the thermal ablation effect and the vibration effect, with the pulse width increase, the paint removal thickness will increase firstly and then decrease slightly, which is caused by the combination of the increased thermal effect and the decreased vibration effect. With the increase of laser power, the paint removal thickness will increase, and when the laser power becomes too large, the substrate is oxidized and turns black. After the parameter optimization, the paint removal efficiency reaches 1.4m(2)/h and the surface of the sample is undamaged, obviously the laser paint striping can meet the paint removal requirements of the high-speed railway carriages.