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 1.4m2/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.
Laser-MIG hybrid welding was carried out on 304 stainless steel in order to study the hybrid effect of two heat sources of laser and MIG. The influence of energy parameters including laser and MIG power and their line energy of hybrid welding on weld formation was investigated and the optimal energy ratio between laser and MIG arc was got in this study. The results show that the increase of laser power has a dominant effect on the increase of weld penetration, while the increase of MIG arc power has a small effect on the increase of weld penetration which is mainly used to improve forming stability and welding bridging ability. Hybrid effect of laser power and arc power on formation was investigated and processing window diagram was obtained which is of great guiding significance.
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