Mr. Yuan Chen Profile

Yuan Chen

at Harbin Institute of Technology

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Proceedings Article | 2 December 2020 Paper

Influence of laser beam oscillation on welding stability and molten pool dynamics

Yuan Chen, Zhenglong Lei, Zhou Heng

Proceedings Volume 11717, 1171720 (2020) https://doi.org/10.1117/12.2587165

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As a new laser welding, laser oscillating welding has the advantages of better gap adaptability, less porosity and higher strength compared with conventional laser welding. Moreover, due to beam oscillation, the variation of molten pool flow contributes to the formations of porosity and cracks, welding stability, microstructure and properties. Thus to the poor welding stability and porosity in welding of TB8 titanium alloy, laser oscillating welding is applied in the way of transverse and longitude pattern. The results show that the traditional transverse oscillating welding still has a small amount of spatter, but spatter can be avoided by adjusting the energy flux of weld edge in transverse or longitude oscillating welding. Oscillation beam is good for flow of molten pool because of the excursion effect of laser beam stirring on fluid. At the end of welding pool, vortexes that are opposite to each other and distributed on both sides of welding pool plays an important role on grain refining. Oscillation beam also suppresses porosity with low frequency transverse oscillation (80Hz) or high frequency longitude oscillation (150Hz).

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