This dissertation deals with circumferential micro two-beam laser welding (TBLW). TBLW is an advanced circumferential laser welding technology that reduces welding distortions while improving process productivity. TBLW therefore offers great potential, especially when joining precision cylindrical components in high volumes. However, the simultaneous use of two laser beams complicates welding process control and increases the risk of weld leakage due to the formation of two weld end craters on a single weld. This research work aims to find solutions to these challenges.
The thesis is an important contribution to the development of science in the field of circumferential welding of miniature components. In particular, this work scientifically defines the circumferential TBLW and shows that TBLW significantly improves the dimensional accuracy of welded assemblies compared to single-beam laser welding. The developed circumferential weld termination method reduces weld end crater defects to such an extent that hermetic welds can be produced even when TBLW is used. The developed condition-based maintenance system is also an important contribution to the development of circumferential laser welding. It solves the problem of controlling the TBLW process and thus enables the transfer of sensitive TBLW to high volume production.
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