Journal ArticleDOI
Real-time measurement method of melt pool temperature in the directed energy deposition process
TLDR
In this paper, a high-speed measuring optical path for a temperature field using a single camera is designed based on dual-wavelength thermometry, and an on-line temperature measurement system is developed, and its validation experiment indicates a measuring error of less than 1%.About:
This article is published in Applied Thermal Engineering.The article was published on 2020-08-01. It has received 13 citations till now. The article focuses on the topics: Temperature measurement & Ratio distribution.read more
Citations
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Journal ArticleDOI
Online defect detection method and system based on similarity of the temperature field in the melt pool
Wei-wei Feng,Zhuangzhuang Mao,Yang Yang,Heng Ma,Kai Zhao,Chaoqi Qi,Ce Hao,Zhanwei Liu,H. Xie,Sheng Liu +9 more
TL;DR: Wang et al. as mentioned in this paper proposed a defect detection method, called temperature distribution similarity detection (TDSD), based on the similarity of the global distribution or the front heating region of the temperature field in the melt pool.
Proceedings ArticleDOI
A survey of thermal sensing application in additive manufacturing
TL;DR: In this paper, the authors present a review of polymer and metal-based additive manufacturing processes, including in-situ characterization, post-build analysis, experimental setups, modeling, and machine learning.
Journal ArticleDOI
Online in-situ monitoring of melt pool characteristic based on a single high-speed camera in laser powder bed fusion process
Heng Ma,Zhuangzhuang Mao,Wei Feng,Yang Yang,Ce Hao,Jian Bang Zhou,Sheng Liu,H. Xie,Guangping Guo,Zhanwei Liu +9 more
TL;DR: In this paper , a coaxial temperature measurement system with a single high-speed camera in the laser powder bed fusion (LPBF) process is developed, including the design of the relay and optical path amplification system, and the beam splitting and chromatic aberration correction system.
Journal ArticleDOI
Research on synchronous measurement technique of temperature and deformation fields using multispectral camera with bilateral telecentric lens
TL;DR: In this paper , a bilateral telecentric-multispectral imaging system was established, and the research of synchronous measurement technique of the temperature and deformation fields was developed.
Journal ArticleDOI
Prediction of molten pool temperature and processing quality in laser metal deposition based on back propagation neural network algorithm
TL;DR: In this paper , three models, based on the back propagation neural network (BPNN), random forest (RF) algorithms and response surface methodology (RSM) approach, respectively, were used to establish prediction relationships between the deposition input parameters and processing status parameters, geometric morphology and mechanical property parameters.
References
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Journal ArticleDOI
A Review on Process Monitoring and Control in Metal-Based Additive Manufacturing
Gustavo Tapia,Alaa Elwany +1 more
Journal ArticleDOI
Process defects and in situ monitoring methods in metal powder bed fusion: a review
TL;DR: In this paper, a review of the literature and the commercial tools for insitu monitoring of powder bed fusion (PBF) processes is presented, focusing on the development of automated defect detection rules and the study of process control strategies.
Journal ArticleDOI
In situ X-ray imaging of defect and molten pool dynamics in laser additive manufacturing
Chu Lun Alex Leung,Sebastian Marussi,Robert Atwood,Michael Towrie,Philip J. Withers,Peter D. Lee +5 more
TL;DR: A mechanism map for predicting the evolution of melt features, changes in melt track morphology from a continuous hemi-cylindrical track to disconnected beads with decreasing linear energy density and improved molten pool wetting with increasing laser power is developed.
Journal ArticleDOI
Melt pool temperature and cooling rates in laser powder bed fusion
TL;DR: In this paper, a two-wavelength imaging setup is used to account for changes in emissivity and temperature fields are captured at 100 kHz with a resolution of 20μm during the processing of a simple Ti6Al4V component.
Journal ArticleDOI
Additive manufacturing of 3D nano-architected metals
TL;DR: A lithography-based process to produce 3D nanoporous nickel nanolattices with octet geometries and a resolution of 100 nm is developed, demonstrating an efficient pathway to 3D-print micro-architected and nano- architected metals with sub-micron resolution.