A research on the laser cut formation by means of a physico-mathematical model and software is presented. The processes of energy absorption, chemical reactions, and vaporization in the film under the supersonic gas flow forces, accounting for the compression shocks along the front, are analyzed.
A physical and mathematical model of non-stationary laser remote welding for line lap welds and its numerical approximation are presented. The model takes into account the variation of the beam incidence angle and the focus position. The calculated results correspond very well to the experimental data obtained by means of a CO2-laser and a Nd-YAG laser.
The seam formation in laser beam welding of fillet weld is considered. The aim of modelling is to predict the position, shape and size of the weld cross section dependent on the applied process parameters and the material properties of the workpiece. The numerical simulation is based on solving the equation of conservation of energy by the finite difference method within a continuous simulation domain. The zones of the simulation domain are different in respect of the thermodynamical material properties and the velocities of matter motion. The position of the inner and outer interfaces between the zones results from the numerical solution of the equilibrium equation of the interface forces. The mass balance is set up inclusive of the filler wire, the thermal expansion of the base and filler metal and the gap width between the jointed parts. The effect of the wire feed rate on the formation of laser beam welded butt with the displacement of edges inclusive tailored blanks and fillet welds in steel and aluminium alloys is verified by experimental results.
The theoretical basis for the self-consistent numerical simulation of laser penetration welding is presented. The model is based on the equations of energy transport and of equilibrium at the free surfaces for balancing vapor pressure, capillary pressure and a correction term. The correction term allows balancing the metal volume taking into account thermal expansion and shrinkage during welding and the gap width between the parts to be joined. The model was verified with welding experiments on steel and aluminium alloys. The uncertainties of the simulation and verification of the cross-sectional geometric parameters of welds are investigated. The associated software DB-LASIM is presented and its industrial applicability demonstrated for the butt and overlap joints.
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