Mr. Ziyi Luo Profile

Ziyi Luo

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Publications (3)

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Proceedings Article | 2 December 2020 Paper

Microstructural and electrochemical characterization of aluminum / steel joints conducted by dual-beam laser

Shanguo Han, Yongqiang Yang, Ziyi Luo, Detao Cai, Shida Zheng, Yaoyong Yi

Proceedings Volume 11717, 1171713 (2020) https://doi.org/10.1117/12.2586273

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The microstructure, mechanical and electrochemical properties of dissimilar materials welded joints, which conducted by laser dual-beam, composed of dual-phase stainless steel DP 780 and 5083 aluminum alloy has been investigated. Microstructures of the joints were studied using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Properties of the joints were evaluated by performing micro-hardness tests and electrochemical tests. The results show that the microstructure of weld is consists of three parts, the zone of coarse-grained martensite, the lath martensite zone and the fine-grain martensite zone from bottom to top. The inter-metallic compound FeAl2 is distributed on the edge of the weld on steel-side, while the inter-metallic compound Al3Fe exists as discrete island on aluminum-side. After remelting and recrystallizing, the heat-affected zone micro-hardness of dual-phase stainless steel is harder than that of base material and the weld, while the area with highest micro-hardness of aluminum is the weld. The electrochemical characterization is acquired by the scanning vibrating electrode technique (SVET), the peaks of anodic current density are near to fusion zone, but the peaks of cathode current density are distribute in weld and HAZ on the SVET maps. The corrosion resistance of the aluminum alloy base material and the lower part of weld is better than other areas after prolonged corrosion.

Proceedings Article | 2 December 2020 Paper

Experimental studies on laser paint striping of high-speed railway carriages

Yafei Xue, Ziyi Luo, Shanguo Han, Detao Cai, Wanghui Xu, Weiping Fang, Yu Chen, Bingbing Luo, Haoting Liu

Proceedings Volume 11717, 1171708 (2020) https://doi.org/10.1117/12.2580088

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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.

Proceedings Article | 17 May 2019 Paper

Influence of energy parameters in Laser-MIG hybrid welding on weld formation of 304 stainless steel

Detao Cai, Limei Han, Ziyi Luo, Shanguo Han

Proceedings Volume 11170, 1117017 (2019) https://doi.org/10.1117/12.2532806

KEYWORDS: Laser welding, Laser energy, Thermal effects, Laser processing

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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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