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33 results on '"Li, Yanjiang"'

12. Molten pool stability of thin-wall parts in robotic GMA-based additive manufacturing with various position depositions

Author

Yin Ziqiu, Li Yanjiang, and Jun Xiong

Subjects
0209 industrial biotechnology, Fabrication, Materials science, General Mathematics, 020208 electrical & electronic engineering, Modified method, 02 engineering and technology, Substrate (electronics), Stability (probability), Industrial and Manufacturing Engineering, Computer Science Applications, Arc (geometry), 020901 industrial engineering & automation, Control and Systems Engineering, Position (vector), Thin wall, 0202 electrical engineering, electronic engineering, information engineering, Composite material, Molten pool, Software
Abstract

Robotic gas metal arc (GMA) based additive manufacturing is regarded as a potential technology for the fabrication of large-size metal components with complex shape. However, as wire feed speed increases in GMA, molten pool of thin-wall parts becomes unstable due to powerful impact of arc force, leading to poor forming quality. In this study, a modified method changing the inclination angle θ between the GMA torch and substrate was proposed to improve the molten pool stability of thin-wall parts. The molten pool stability of thin-wall parts deposited with various positions in which the inclination angle ranged from 45° to 135° was investigated. Experiments indicated that the molten pool stability of thin-wall parts was improved effectively by decreasing the inclination angle. Compared with vertical (θ = 90°) and backward (θ > 90°) positions, depositing with forward position (θ

Published
2019

14. Influences of process parameters on surface roughness of multi-layer single-pass thin-walled parts in GMAW-based additive manufacturing

Author

Li Yanjiang, Rong Li, Yin Ziqiu, and Jun Xiong

Subjects
Surface (mathematics), 0209 industrial biotechnology, Engineering drawing, Materials science, Machine vision, Metals and Alloys, Process (computing), 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, Industrial and Manufacturing Engineering, Computer Science Applications, Gas metal arc welding, law.invention, 020901 industrial engineering & automation, Quality (physics), law, Modeling and Simulation, Ceramics and Composites, Surface roughness, Composite material, 0210 nano-technology, Constant (mathematics)
Abstract

Gas metal arc welding (GMAW) based additive manufacturing has been demonstrated to be a promising technique capable of reasonably utilizing materials and energies for manufacturing complex large-size metallic components. However, a critical issue in this technique is the deterioration of surface quality on the side face of fabricated parts. In this paper, a methodology based on a laser vision system was proposed to view the surface appearance on the side face of multi-layer single-pass low-carbon steel parts deposited in GMAW-based additive manufacturing, and a corresponding evaluation method was established to quantify the surface roughness. The effects of main process parameters, such as the inter-layer temperature, wire feed speed, travel speed, and constant ratio of wire feed speed to travel speed, on the surface roughness of thin-walled parts were investigated and discussed in detail. Based on the results, a better understanding of the influential mechanisms of the process parameters on the surface roughness can be obtained. With other parameters being constant, decreasing the inter-layer temperature is associated with the increase of the surface quality of thin-walled parts. Maintaining the ratio of wire feed speed to travel speed constant, the surface roughness increases with the increasing wire feed speed. A lower wire feed speed matching a lower travel speed can decrease the surface roughness.

Published
2018

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