The present article presents a simplified model for calculating the flow and temperature in laser transmission welding of thermoplastics. The respective influences of laser intensity, warming up time and both the joining pressure and the joining displacement on the quality of the weld have generally been established through experimental studies. In order to be able to predict the temperature, the melt shift profiles and the residual melt layer thickness in the welding zone (heat affected zone), calculations were performed on the basis of a simplified mathematical-physical model, employing finite element analysis. The model permits the comprehensive simulation of the process variants of contour welding, quasi-simultaneous welding and simultaneous welding. The model makes allowance for both the influence of the mechanical and thermal loading on the residual melt layer thickness and the temperature profiles in the joining seam. The calculations show, both the temperature and the residual melt layer thickness fall considerably as the joining pressure increases. The theoretical derivation and comparison of simulation calculations revealed the influence of the scanning frequency and scanning velocity on the temperature development in the joining plane. For a given power distribution, scanning velocity and scanning frequency, conclusions can be drawn regarding an equivalent temperature development for simultaneous welding. The formulations implemented in the model and the degrees of freedom in respect of the choice of materials to be joined and the welding parameters employed mean that there is scope for optimizing the model. on the basis of experimental data.
Simulation of quasi-simultaneous and simultaneous laser welding
Welding in the World ; 52 , 1/2 ; 56-66
2008
11 Seiten, 15 Bilder, 8 Quellen
Aufsatz (Zeitschrift)
Englisch
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