Effect of carbon black on temperature field and weld profile during laser transmission welding of polymers: A FEM study

The influence of the carbon black on temperature distribution and weld profile, during laser transmission welding of polymers, is investigated in the present research work. A transient numerical model, based on conduction mode heat transfer, is developed to analyze the process. The heat input to the model is considered to be the volumetric Gaussian heat source. The computation of temperature field during welding is carried out for polycarbonates having different proportion of carbon black in polymer matrix. The temperature dependent material properties of polycarbonate are taken into account for modeling. The finite element code ANSYS® is employed to obtain the numerical results. The numerically computed results of weld pool dimensions are compared with the experimental results. The comparison shows a fair agreement between them, which gives confidence to use the developed model for intended investigation with acceptable accuracy. The results obtained have revealed that the carbon black has considerable influence on the temperature field distribution and the formation of the weld pool geometry.

► Effect of the carbon black on laser transmission welding of polymers is investigated.
► A transient numerical model is developed to simulate and analyze the process.
► Carbon black has considerable influence on the formation of the weld pool geometry.
► Variation in carbon black content in polymer matrix changes the nature of absorption.
► Requirement of laser power strongly depends on the carbon black content.