Heat Transfer Research

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Modeling of the Effect of the Temporal Shape of a Laser Pulse on the Processes of Metal Treatment

V. I. Mazhukin
Institute of Mathematical Simulation, Russian Academy of Sciences, Moscow, Russia

V. V. Nosov
Institute of Mathematical Simulation, Russian Academy of Sciences, Moscow, Russia

U. S. Semmler
Society of Scientific-Technical Development, Kemnitz, Germany

ABSTRACT

The paper presents the results of mathematical simulation dealing with unsteady effects induced by variation of temporal energy distribution in a laser pulse for the so-called engineering range of intensity 10⁴–10⁷ W/cm and duration 10^–6–10^–2 sec. It is established that passing from a rectangle to Gaussian shape of laser pulse, the dynamics of a number of the process parameters, particularly, the melting front velocity and the melt layer thickness change significantly. The maximum melt thickness for Gaussian pulses is reached after the laser pulse termination and exceeds the value of steady-state estimation by 1–2 orders of magnitude. However, this approximation appears to be quite accurate to predict thickness of the layer evaporated.