Effects of Process Parameters upon the Shape Memory and Pseudo-Elastic Behaviors of Laser-Welded NiTi Thin Foil |
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Authors: | C W Chan H C Man T M Yue |
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Affiliation: | (1) Laser Processing Group, Advanced Manufacturing Technology Research Centre, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, P.R. China;; |
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Abstract: | This article discusses the effects of laser welding parameters such as power, welding speed, and focus position on the weld
bead profile, microstructure, pseudo-elasticity (PE), and shape memory effect (SME) of NiTi foil with thickness of 250 μm using 100W CW fiber laser. The parameter settings to produce the NiTi welds for analysis in this article were chosen from
a fractional factorial design to ensure the welds produced were free of any apparent defect. The welds obtained were mainly
of cellular dendrites with grain sizes ranging from 2.5 to 4.8 μm at the weld centerline. A small amount of Ni3Ti was found in the welds. The onset of transformation temperatures (A
s
and M
s
) of the NiTi welds shifted to the negative side as compared to the as-received NiTi alloy. Ultimate tensile stress of the
NiTi welds was comparable to the as-received NiTi alloy, but a little reduction in the pseudo-elastic property was noted.
Full penetration welds with desirable weld bead profiles and mechanical properties were successfully obtained in this study. |
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Keywords: | |
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