The applying of the short — term cross correlation in optical diagnostics of melt convection in laser metal deposition

Abstract The time dependences of the surface temperature and the surface area of the melt bath during the formation of the single track in the laser metal deposition technology were obtained using a multi-wave optical diagnostics complex. The short - term cross-correlation method was used to analyse the measured parameters of the bath surface, and relationship of the measured parameters with the processes of thermocapillary convection in the melt was shown.

Download Full-text

The control of the height and shape of the track in laser metal deposition by the QCW laser mode

Journal of Physics Conference Series ◽

10.1088/1742-6596/2144/1/012001 ◽

2021 ◽

Vol 2144 (1) ◽

pp. 012001

Author(s):

P S Rodin ◽

V D Dubrov

Keyword(s):

Laser Power ◽

Metal Deposition ◽

Control Mode ◽

Laser Metal Deposition ◽

Laser Mode ◽

Temperature Regimes ◽

Track Formation ◽

Average Laser Power ◽

The Difference ◽

Deposition Technology

Abstract The control of the track shape in laser metal deposition technology by the QCW laser mode has been studied. The different geometric characteristics of the tracks are shown to obtain at the same average laser power, depending on the selected laser power control mode. The difference in the temperature regimes of track formation is shown.

Download Full-text

Optical method of on-line temperature monitoring on the melt surface in laser metal deposition technology

Optical Measurement Systems for Industrial Inspection XI ◽

10.1117/12.2527636 ◽

2019 ◽

Author(s):

Yuri N. Zavalov ◽

Alexander V. Dubrov ◽

Vladimir D. Dubrov

Keyword(s):

Optical Method ◽

Metal Deposition ◽

Temperature Monitoring ◽

Laser Metal Deposition ◽

On Line ◽

Line Temperature ◽

Deposition Technology

Download Full-text

Development of laser metal deposition technology with IR and blue diode lasers (Conference Presentation)

Laser 3D Manufacturing V ◽

10.1117/12.2297605 ◽

2018 ◽

Author(s):

Masahiro Tsukamoto ◽

Yuji Sato ◽

Ritsuko Higashino ◽

Kohei Asano ◽

Yoshinori Funada ◽

...

Keyword(s):

Diode Lasers ◽

Metal Deposition ◽

Laser Metal Deposition ◽

Deposition Technology

Download Full-text

Numerical simulation of particles flow in Laser Metal Deposition technology comparing Eulerian-Eulerian and Lagrangian-Eulerian approaches

Journal of Manufacturing Processes ◽

10.1016/j.jmapro.2021.05.027 ◽

2021 ◽

Vol 68 ◽

pp. 186-197

Author(s):

Mauro Murer ◽

Valentina Furlan ◽

Giovanni Formica ◽

Simone Morganti ◽

Barbara Previtali ◽

...

Keyword(s):

Numerical Simulation ◽

Metal Deposition ◽

Laser Metal Deposition ◽

Deposition Technology

Download Full-text

Application of cross correlation to HREM images of surfaces

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100128080 ◽

1987 ◽

Vol 45 ◽

pp. 754-755

Author(s):

D. E. Luzzi ◽

L. D. Marks ◽

M. I. Buckett

Keyword(s):

Cross Correlation ◽

A Priori ◽

Matrix Material ◽

Correlation Method ◽

Accurate Knowledge ◽

Complex Image ◽

Fourier Filtering ◽

The Matrix ◽

Low Pass ◽

Data Reduction Technique

As the HREM becomes increasingly used for the study of dynamic localized phenomena, the development of techniques to recover the desired information from a real image is important. Often, the important features are not strongly scattering in comparison to the matrix material in addition to being masked by statistical and amorphous noise. The desired information will usually involve the accurate knowledge of the position and intensity of the contrast. In order to decipher the desired information from a complex image, cross-correlation (xcf) techniques can be utilized. Unlike other image processing methods which rely on data massaging (e.g. high/low pass filtering or Fourier filtering), the cross-correlation method is a rigorous data reduction technique with no a priori assumptions.We have examined basic cross-correlation procedures using images of discrete gaussian peaks and have developed an iterative procedure to greatly enhance the capabilities of these techniques when the contrast from the peaks overlap.

Download Full-text