Heat flow model for laser welding of polymers

KENNISH, Y.C., SHERCLIFF, H.R. and McGRATH, G.C., 2002
in Annual Technical Conference (ANTEC 2002), San Francisco, CA, USA, 1-Processing, 1132-1136

Amorphous polymersheat flow modelwelding parametersprocess diagram

ClearWeld is an innovative laser welding process that creates strong joints in optically transparent polymers and synthetic fabrics. There is no visible joint line or surface damage using an IR absorbing ink. An analytical heat conduction model is developed to predict the process capabilities and weld characteristics. Experiments using single lap joints in amorphous transparent Polyethylene Terephthalate (PETG) are used to validate this model. Further analysis of failure modes in the joints as a function of processing parameters (power, speed, pressure, etcÄ) allows the development of process charts to aid in the optimisation of the welding process.