Ultrasound-assisted laser welding for the generation of formable mixed compounds (A03)

• Subject Area: Joining and Separation Technology
• Term: since 2015
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 252662854

The aim of subproject A03 is to investigate the grain-refining capabilities of high-amplitude ultrasonic fields generated in a controlled manner during laser-beam welding. The necessary stabilization of the welding process is generated by beam shaping and laser-power modulation. In addition, we want to explore how multivariable control, based on quality characteristics in the process (weld protrusion, weld penetration depth and spatter formation), can be used to minimize cracking from weld to weld. As important factors of influence, the effects of acoustic softening and acoustic hardening within the weld seam and the heat-affected zone are analyzed during cooling after welding.

• DFG Programme: Collaborative Research Centres
• Subproject of: SFB 1153: Process Chain for Manufacturing of Hybrid High Performance Components by Tailored Forming
• Applicant Institution: Gottfried Wilhelm Leibniz Universität Hannover
• Project Heads: Dr.-Ing. Thomas Hassel, until 6/2019; Professor Dr.-Ing. Stefan Kaierle; Professor Dr.-Ing. Jörg Wallaschek