MEASURING THE DEPTH OF PENETRATION OF THE LASER BEAM IN THE ABSORBING MATERIAL FOR THROUGH-TRANSMISSION WELDING PROCESSES

摘要

The numerical modeling of various TTLW processes has the potential to be very useful for predicting laser welding results. However these models must assume either an absorption coefficient, or a depth of penetration in which the beam is absorbed. Accurately measuring the coefficient is not generally convenient, and is sensitive to small changes in carbon black concentration from batch to batch. A simpler test procedure for estimating the depth of penetration in the absorbing layer is described in this paper.