Gap behaviour during viscous gap bridging of glass using ultra-short pulsed lasersTuesday (23.06.2020) 14:40 - 15:00 Room 2
In recent years there has been a tremendous progress in the development of glass welding technology using ultra-short pulsed (USP) lasers. On one hand, this development has been motivated by the various advantages of this technology, such as the possibility for hermetic sealing without exerting any noteworthy thermal stresses on the joining parts. On the other hand, the development has quickened because it was found that sufficient joining quality can be achieved even in the presence of a gap between the joining partners [1-3] which allows the joining of glass parts manufactured using standard float processes only, i.e. without any secondary polishing steps.
Conversely to a typical welding procedure the gap bridging process may not necessarily occur just by using a single seam. While the “single-seam” joining can be established with sufficiently high pulse energy and average power, for lower power “settings” gap bridging can be established, too, if several welding seams are used in combination. This is illustrated in Fig. 1 which shows a set of welding seams that start on the left and are placed subsequently to the right until an optical contact is established between the glass plates. In this talk we will present first an overview on the USP laser based gap-bridging while the behaviour of the gap for welding conducted at a “relatively” low energy input per unit length will be discussed in greater detail.
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