Laser welding of NiTi shape memory alloy: A review

Mehrshad Mehrpouya*, Annamaria Gisario, Mohammad Elahinia

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

59 Citations (Scopus)

Abstract

NiTi shape memory alloys (SMA) are broadly employed in multifunctional systems in several industrial domains, like aerospace, automotive, biomedical and power plants. Their functional properties, which include shape memory effect (SME) and superelasticity (SE), offer a particular flexibility to design many smart components. However, scientists and practitioners are still facing some restrictions in machining processes and joining techniques of NiTi SMAs to both similar and dissimilar materials. Compared to other procedures, laser welding is an economical and reliable joining technique for NiTi SMAs. Nevertheless, it is considered a challenging technique, with many obstacles still to overcome to achieve welded joints characterized by the necessary strength and the required functionalities. In this respect, the present work investigates the effects of laser welding process on the functional properties of NiTi and related alloys. Mechanical, microstructural, and metallurgical effects of the process are reported, as well. Lastly, the impact of the post-weld heat treatment (PWHT) is studied as an effective solution to improve the downsides of the laser welding process.
Original languageEnglish
Pages (from-to)162-186
JournalJournal of Manufacturing Processes
Volume31
DOIs
Publication statusPublished - 2018
Externally publishedYes

Keywords

  • Laser welding
  • NiTi shape memory alloys
  • Superelasticity
  • Shape memory effect
  • Heat affected zone
  • Fusion zone

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