In laser transmission welding, the parts to be joined are brought into contact prior to welding, and the heating and joining phases take place simultaneously. The laser beam of the N d: YAG laser penetrates the transparent part being joined and is converted into heat by the absorbing part. The transparent part is similarly heated and plasticized by means of heat conduction, thereby ensuring that the parts are welded together.When the heating phase was analyzed, it was seen that if the part that absorbs the laser beam has a high absorption constant, this process phase can be readily described by a physico-mathematical model, by analogy to single-sided heat impulse welding. A comparison of calculated and measured melt layer thicknesses showed that, by introducing a correction factor, it is possible for this model to be successfully used for the case of a low absorption constant as well.
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