Experimental measurement of the powder flow velocity in a three-port coaxial laser metal deposition nozzle by high-speed imaging

2021 ◽  
Vol 33 (4) ◽  
pp. 042021
Author(s):  
Angel-Iván García-Moreno ◽  
Juan-Manuel Alvarado-Orozco ◽  
Juansethi Ibarra-Medina ◽  
Aldo López-Martínez ◽  
Enrique Martínez-Franco
Keyword(s):  
Flow Velocity ◽  
Experimental Measurement ◽  
High Speed ◽  
Metal Deposition ◽  
Powder Flow ◽  
Laser Metal Deposition ◽  
High Speed Imaging

A new PIV method to measure powder flow velocity in laser metal deposition: an Eulerian-based approach

2021 ◽  
Author(s):  
Angel-Iván García-Moreno ◽  
Juan-Manuel Alvarado-Orozco ◽  
Juansethi Ibarra-Medina ◽  
Aldo López-Martínez ◽  
Enrique Martínez-Franco
Keyword(s):  
Flow Velocity ◽  
Metal Deposition ◽  
Powder Flow ◽  
Laser Metal Deposition ◽  
Piv Method

Variable Powder Flow Rate Control in Laser Metal Deposition Processes

2008 ◽  
Author(s):  
Lie Tang ◽  
Jianzhong Ruan ◽  
Robert G. Landers ◽  
Frank Liou
Keyword(s):  
Transport System ◽  
Flow Rate ◽  
Rate Control ◽  
Metal Deposition ◽  
Powder Flow ◽  
Laser Metal Deposition ◽  
Motion System ◽  
Powder Flow Rate ◽  
Deposition Processes ◽  
Flow Rate Control

This paper proposes a novel method, called Variable Powder Flow Rate Control (VPFRC), for the regulation of powder flow rate in laser metal deposition processes. The idea of VPFRC is to adjust the powder flow rate to maintain a uniform powder deposition per unit length even when disturbances occur (e.g., the motion system accelerates and decelerates). Dynamic models of the powder delivery system motor and the powder transport system (i.e., five–meter pipe, powder dispenser, and cladding head) are constructed. A general tracking controller is then designed to track variable powder flow rate references. Since the powder flow rate at the nozzle exit cannot be directly measured, it is estimated using the powder transport system model. The input to this model is the DC motor rotation speed, which is estimated on–line using a Kalman filter. Experiments are conducted to examine the performance of the proposed control methodology. The experimental results demonstrate that the VPFRC method is successful in maintaining a uniform track morphology, even when the motion system accelerates and decelerates.

Effect of Powder Flow Rate and Gas Flow Rate on the Evolving Properties of Deposited Ti6Al4V/Cu Composites

2014 ◽  
Vol 1016 ◽  
pp. 177-182 ◽  
Author(s):  
Mutiu F. Erinosho ◽  
Esther Titilayo Akinlabi ◽  
Sisa Pityana
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Pure Copper ◽  
Metal Deposition ◽  
Powder Flow ◽  
Laser Metal Deposition ◽  
Gas Flow Rate ◽  
Flow Rates ◽  
Powder Flow Rate ◽  
Hardness Values

—Pure copper was deposited with Ti6Al4V alloy via laser metal deposition (LMD) process to produce Ti6Al4V/Cu composites. This paper reports the effect of powder flow rate (PFR) and gas flow rate (GFR) of laser metal deposited Ti6Al4V/Cu composites. The deposited samples were characterised through the evolving microstructure and microhardness. It was observed that the PFR and GFR have an influence on the percentage of porosity present in the samples. The higher the flow rates of the powder and the gas, the higher the degree of porosity and vice versa. The widmanstettan structures were observed to be finer as the flow rate reduces which in turn causes a decrease in the hardness values of the deposited composites. The hardness values varied between HV381.3 ± 60 and HV447.3 ± 49.

Laser metal deposition of vanadium-rich high speed steel: Microstructural and high temperature wear characterization

2019 ◽  
Vol 364 ◽  
pp. 115-126 ◽  
Author(s):  
N. Ur Rahman ◽  
L. Capuano ◽  
M.B. de Rooij ◽  
D.T.A. Matthews ◽  
A. Garcia-Junceda ◽  
...  
Keyword(s):  
High Temperature ◽  
High Speed ◽  
High Speed Steel ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
High Temperature Wear ◽  
Wear Characterization

scholarly journals Inspection of Powder Flow During LMD Deposition by High Speed Imaging

2016 ◽  
Vol 83 ◽  
pp. 1319-1328 ◽  
Author(s):  
Javier Montero ◽  
Ángel Rodríguez ◽  
José Manuel Amado ◽  
Armando J. Yáñez
Keyword(s):  
High Speed ◽  
Powder Flow ◽  
High Speed Imaging
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