Optical seam quality
The project "laser brazing with wire oscillation for increasing the optical seam quality" was conducted over the last two years at BIAS hand in hand with interested partners from the industry (BIAS - Bremer Institut für angewandte Strahltechnik GmbH). The aim of improving especially the optical seam edge quality of laser brazed seams in car body construction was achieved under the supervision of Dr. Ing. Peer Woizeschke. For this purpose, a new approach of wire oscillation was applied onto the otherwise constant wire feed, which was proven to be effective in influencing the melt pool during brazing and thus homogenising the wetting process. The optical seam edge quality can be increased without the need for an often-practiced local removal of the corrosion-protective zinc layer of the hot-dip galvanised material prior to brazing. The required wire oscillation can be achieved by using highly dynamic wire feed units, which are already commercially available.