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Effect of welding parameters on functionality of dissimilar laser-welded NiTi superelastic (SE) to shape memory effect (SME) wires

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Abstract

Numerous are the applications of NiTi shape memory alloys (SMA) in smart designs and structures. Many researchers and manufacturers investigate laser welding and joining process to integrate the functionalities of NiTi alloys, including superelasticity (SE) and shape memory effect (SME). Accordingly, this integration would provide better flexibility to that class of materials which can be applied in the development of multi-functional systems and components. The present study investigates the laser welding of dissimilar NiTi wires, including both SE and SME wires, using a high-power diode laser (HPDL). The resulting welded joints were investigated using various mechanical and microstructural analysis including optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), differential scanning calorimetry (DSC), and tensile and micro-hardness tests. Various operational parameters, that is, laser power and speed, were investigated to obtain high-quality welded joints, preserve the transformation temperature of the welded zone, and, subsequently, minimize the influence of the welding process on the functionality of the joined materials.

Laser welding process of NiTi (SE) to NiTi (SME).

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Acknowledgments

The authors thank Dr. Elisa Pizzi for her assistance in the DSC test. Also, the authors would like to acknowledge Mr. Riccardo D’Amico and Mr. Attilio Panella for their contributions in the experimental tests.

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Authors and Affiliations

  1. Dipartimento di Ingegneria, Università degli Studi Roma Tre, Via Vito Volterra 62, 00146, Roma, Italy

    Mehrshad Mehrpouya, Michela Puopolo & Massimiliano Barletta

  2. Dipartimento di Ingegneria Meccanica ed Aerospaziale, Sapienza Università degli Studi di Roma, Via Eudossiana 18, 00184, Roma, Italy

    Annamaria Gisario & Giovanni Battista Broggiato

  3. Dipartimento di Ingegneria dell’Impresa, Università degli Studi di Roma Tor Vergata, Via del Politecnico 1, 00133, Roma, Italy

    Silvia Vesco

Authors
  1. Mehrshad Mehrpouya
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  2. Annamaria Gisario
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  4. Michela Puopolo
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  5. Silvia Vesco
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  6. Massimiliano Barletta
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Correspondence to Mehrshad Mehrpouya.

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Mehrpouya, M., Gisario, A., Broggiato, G.B. et al. Effect of welding parameters on functionality of dissimilar laser-welded NiTi superelastic (SE) to shape memory effect (SME) wires. Int J Adv Manuf Technol 103, 1593–1601 (2019). https://doi.org/10.1007/s00170-019-03514-7

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  • DOI: https://doi.org/10.1007/s00170-019-03514-7

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