scholarly journals Influence of Process Parameters on the Process Efficiency in Laser Metal Deposition Welding

2016 ◽  
Vol 83 ◽  
pp. 657-666 ◽  
Author(s):  
Michael Güpner ◽  
Andreas Patschger ◽  
Jens Bliedtner
Keyword(s):  
Process Parameters ◽  
Metal Deposition ◽  
Process Efficiency ◽  
Laser Metal Deposition ◽  
Influence Of Process Parameters

Research on Process Parameters of Laser Metal Deposition Quality Influence

Applied laser ◽  
2013 ◽  
Vol 33 (3) ◽  
pp. 245-249
Author(s):  
崔宝磊 Cui Baolei ◽  
尚纯 Shang Chun ◽  
杨光 Yang Guang ◽  
卞宏友 Bian Hongyou ◽  
钦兰云 Qin Lanyun ◽  
...  
Keyword(s):  
Process Parameters ◽  
Metal Deposition ◽  
Laser Metal Deposition

scholarly journals Correlations of Melt Pool Geometry and Process Parameters During Laser Metal Deposition by Coaxial Process Monitoring

2014 ◽  
Vol 56 ◽  
pp. 228-238 ◽  
Author(s):  
Sörn Ocylok ◽  
Eugen Alexeev ◽  
Stefan Mann ◽  
Andreas Weisheit ◽  
Konrad Wissenbach ◽  
...  
Keyword(s):  
Process Monitoring ◽  
Process Parameters ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Melt Pool

scholarly journals A monitoring framework based on exergetic analysis for sustainability assessment of direct laser metal deposition process

2021 ◽  
Author(s):  
Valeria Selicati ◽  
Marco Mazzarisi ◽  
Francesco Saverio Lovecchio ◽  
Maria Grazia Guerra ◽  
Sabina Luisa Campanelli ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Sustainability Assessment ◽  
Metal Deposition ◽  
Process Efficiency ◽  
Laser Metal Deposition ◽  
Sustainable Solutions ◽  
Direct Laser ◽  
Monitoring Framework ◽  
Exergetic Analysis ◽  
Direct Laser Metal Deposition

Abstract With the constant increase of energy costs and environmental impacts, improving the process efficiency is considered a priority issue for the manufacturing field. A wide knowledge about materials, energy, machinery, and auxiliary equipment is required in order to optimize the overall performance of manufacturing processes. Sustainability needs to be assessed in order to find an optimal compromise between technical quality of products and environmental compatibility of processes. In this new Industry 4.0 era, innovative manufacturing technologies, as the additive manufacturing, are taking a predominant role. The aim of this work is to give an insight into how thermodynamic laws contribute at the same time to improve energy efficiency of manufacturing resources and to provide a methodological support to move towards a smart and sustainable additive process. In this context, a fundamental step is the proper design of a sensing and real-time monitoring framework of an additive manufacturing process. This framework should be based on an accurate modelling of the physical phenomena and technological aspects of the considered process, taking into account all the sustainability requirements. To this end, a thermodynamic model for the direct laser metal deposition (DLMD) process was proposed as a test case. Finally, an exergetic analysis was conducted on a prototype DLMD system to validate the effectiveness of an ad-hoc monitoring system and highlight the limitations of this process. What emerged is that the proposed framework provided significant advantages, since it represents a valuable approach for finding suitable process management strategies to identify sustainable solutions for innovative manufacturing procedures.

Experimental Investigation of Temperature Distribution during Wire-Based Laser Metal Deposition of the Al-Mg Alloy 5087

2018 ◽  
Vol 941 ◽  
pp. 988-994 ◽  
Author(s):  
Martin Froend ◽  
Frederic E. Bock ◽  
Stefan Riekehr ◽  
Nikolai Kashaev ◽  
Benjamin Klusemann ◽  
...  
Keyword(s):  
Process Parameters ◽  
Large Scale ◽  
Substrate Material ◽  
Metal Deposition ◽  
Temperature Evolution ◽  
Laser Metal Deposition ◽  
Deposition Rates ◽  
Excessive Heat ◽  
Manufacturing Techniques ◽  
The Individual

Wire-based laser metal deposition enables to manufacture large-scale components with deposition rates significant higher compared to powder-based laser additive manufacturing techniques, which are currently working with deposition rates of only a few hundred gram per hour. However, the wire-based approach requires a significant amount of laser power in the range of several kilowatts instead of only a few hundred watts for powder-based processes. This excessive heat input during laser metal deposition can lead to process instabilities such as a non-uniform material deposition and to a limited processability, respectively. Although, numerous possibilities to monitor temperature evolution during processing exist, there is still a lack of knowledge regarding the relationship between temperature and geometric shape of the deposited structure. Due to changing cooling conditions with increasing distance to the substrate material, producing a wall-like structure results in varying heights of the individual tracks. This presents challenges for the deposition of high wall-like structures and limits the use of constant process parameters. In the present study, the temperature evolution during laser metal deposition of AA5087 using constant process parameters is investigated and a scheme for process parameter adaptions in order to reduce residual stress induced componential distortions is suggested.

Melt Pool Temperature Control for Laser Metal Deposition Processes—Part I: Online Temperature Control

2010 ◽  
Vol 132 (1) ◽  
Author(s):  
Lie Tang ◽  
Robert G. Landers
Keyword(s):  
Temperature Control ◽  
Process Parameters ◽  
Process Model ◽  
Dynamic Balance ◽  
Metal Deposition ◽  
Time Varying ◽  
Laser Metal Deposition ◽  
Melt Pool ◽  
Melt Pool Temperature ◽  
Deposition Processes

Melt pool temperature is of great importance to deposition quality in laser metal deposition processes. To control the melt pool temperature, an empirical process model describing the relationship between the temperature and process parameters (i.e., laser power, powder flow rate, and traverse speed) is established and verified experimentally. A general tracking controller using the internal model principle is then designed. To examine the controller performance, three sets of experiments tracking both constant and time-varying temperature references are conducted. The results show the melt pool temperature controller performs well in tracking both constant and time-varying temperature references even when process parameters vary significantly. However a multilayer deposition experiment illustrates that maintaining a constant melt pool temperature does not necessarily lead to uniform track morphology, which is an important criteria for deposition quality. The reason is believed to be that different melt pool morphologies may have the same temperature depending on the dynamic balance of heat input and heat loss.

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