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Re-solidification dynamics and microstructural analysis of laser welded aluminium

International Journal of Materials Research, ISSN: 1862-5282, Vol: 111, Issue: 1, Page: 17-22
2020
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Article Description

In this work, we investigated the re-solidification dynamics and microstructure of aluminium AA5005 welded by fibre laser. The re-solidification process was visualized by highspeed X-ray imaging at the European Synchrotron Radiation Facility (ESRF, Grenoble, France). The final microstructure was studied by electron backscatter diffraction. The experiments were performed in both conduction and keyhole weld regimes. The results show that fine and equiaxed structure is obtained for conduction welding due to very high cooling rate. Keyhole welding also shows similar structure at the beginning of re-solidification, followed by a columnar microstructure.

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