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Title: Parameter study on laser welding of nitinol wire by taguchi method
Authors: Chan, CW
Man, HC 
Yue, TM 
Issue Date: 2011
Source: 30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011, 2011, p. 833-838 How to cite?
Abstract: 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.
Description: 30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011, Orlando, FL, 23-27 October 2011
Appears in Collections:Conference Paper

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