Microscale Analysis of Melt Pool Dynamics Due To Particle Impingement and Laser-Matter Interaction in the Spot Laser Metal Deposition Process

Chouhan, Arvind; Aggarwal, Akash; Kumar, Arvind

doi:10.1007/s11837-019-04000-x

Cited by 10 publications

(1 citation statement)

References 22 publications

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“…Similar values of the vortex motion velocity were obtained earlier in calculations of the effect of laser radiation on metal during welding, taking into account Marangoni convection [2], and in the calculations of melt motion in LMD technology at certain technological parameters [39]. Similar values were also obtained by X-ray analysis of the velocity of gas bubbles in the melt in LMD [40].…”

Section: Melt Pool Dynamics Evaluationsupporting

confidence: 83%

Short Time Correlation Analysis of Melt Pool Behavior in Laser Metal Deposition Using Coaxial Optical Monitoring

Zavalov

Dubrov

2021

Sensors

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The development and improvement of monitoring and process control systems is one of the important ways of advancing laser metal deposition (LMD). The control of hydrodynamic, heat and mass transfer processes in LMD is extremely important, since these processes directly affect the crystallization of the melt and, accordingly, the microstructural properties and the overall quality of the synthesized part. In this article, the data of coaxial video monitoring of the LMD process were used to assess the features of melt dynamics. The obtained images were used to calculate the time dependences of the characteristics of the melt pool (MP) (temperature, width, length and area), which were further processed using the short-time correlation (STC) method. This approach made it possible to reveal local features of the joint behavior of the MP characteristics, and to analyze the nature of the melt dynamics. It was found that the behavior of the melt in the LMD is characterized by the presence of many time periods (patterns), during which it retains a certain ordered character. The features of behavior that are important from the point of view of process control systems design are noted. The approach used for the analysis of melt dynamics based on STC distributions of MP characteristics, as well as the method for determining the moments of pattern termination through the calculation of the correlation power, can be used in processing the results of online LMD diagnostics, as well as in process control systems.

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Section: Melt Pool Dynamics Evaluationsupporting

confidence: 83%