Parameter study on laser welding of nitinol wire by Taguchi method

Chi Wai Chan, H.C. Man, T.M. Yue

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


A L27 Taguchi experiment was done to investigate the effect of laser power, welding time, laser mode (CW and two pulsed modes), focus position, and their possible interactions on the weld-bead aspect ratio of laser-welded NiTi wires by using a 100W fibre laser. The optimized parameter setting to produce the full penetrated weldment with minimum welding defects is successfully determined in the Taguchi experiment. The laser mode is found to be the most important parameter that directly controls the weld-bead aspect ratio. The focus position is the secondly important parameter for the laser welding of NiTi wires. Strong interaction between the power and focus position is found in the Taguchi experiment. The optimized weldment produced by the Taguchi experiment is mainly of columnar dendritic structure in the weld zone (WZ) with the size of 1-3µm, while the HAZ exhibits equiaxed grain structure with the size of 5-10µm. The Vickers micro-hardness test indicted that the WZ and HAZ in the weldment are softened to certain extends after fibre laser welding.
Original languageEnglish
Title of host publication30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011
Place of PublicationUS
PublisherLaser Institute of America
Number of pages6
ISBN (Print)978-0-912035-94-9
Publication statusPublished - 2011


  • Laser Welding
  • NiTi
  • Taguchi Method

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