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Influence of Yb:YAG Laser Beam Parameters on Haynes 188 Weld Fusion Zone Microstructure and Mechanical Properties

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Abstract

The weldability of 1.2 mm thick Haynes 188 alloy sheets by a disk Yb:YAG laser welding was examined. Butt joints were made, and the influence of parameters such as power, size, and shape of the spot, welding speed, and gas flow has been investigated. Based on an iconographic correlation approach, optimum process parameters were determined. Depending on the distribution of the power density (circular or annular), acceptable welds were obtained. Powers greater than 1700 W, welding speeds higher than 3.8 m mm−1, and spot sizes between 160 and 320 μm were needed in the circular (small fiber) configuration. By comparison, the annular (large fiber) configuration required a power as high as 2500 W, and a welding speed less than 3.8 m min−1. The mechanical properties of the welds depended on their shape and microstructure, which in turn depended on the welding conditions. The content of carbides, the proportion of areas consisting of cellular and dendritic substructures, and the size of these substructures were used to explain the welded joint mechanical properties.

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Acknowledgments

The authors are thankful to EXAMECA for their financial support, in particular for providing the Haynes 188 alloy. They furthermore thank Cédric Bellot, Director of ACRDM, for giving them access to the synchrotron facilities at ESRF.

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Authors and Affiliations

  1. LGP/ENIT/INPT, Université de Toulouse, 47 av. d’Azereix, BP1629, 65016, Tarbes Cedex, France

    Jérémie Graneix, Jean-Denis Beguin, Joël Alexis & Talal Masri

  2. Laboratoire Génie de Production, Ecole Nationale d’Ingénieurs de Tarbes, 47 avenue d’Azereix, BP1629, 65016, Tarbes Cedex, France

    Joël Alexis

Authors
  1. Jérémie Graneix
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  2. Jean-Denis Beguin
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  3. Joël Alexis
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  4. Talal Masri
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Correspondence to Joël Alexis.

Additional information

Manuscript submitted December 13, 2016.

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Graneix, J., Beguin, JD., Alexis, J. et al. Influence of Yb:YAG Laser Beam Parameters on Haynes 188 Weld Fusion Zone Microstructure and Mechanical Properties. Metall Mater Trans B 48, 2007–2016 (2017). https://doi.org/10.1007/s11663-017-0989-6

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  • DOI: https://doi.org/10.1007/s11663-017-0989-6

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