Abstract
This article presents a study on Ytterbium: Yttrium aluminium garnet (Yb: YAG) laser welding of NiTinol shape memory alloys. NiTinol belongs to a class of smart materials. In recent days, due to its unique properties namely shape memory effect, biocompatibility and superelasticity it is finding wide range of applications in the field of automotive, aerospace, fashion, and biomedical industries. Bead on plate welding was done on NiTinol sheets based on L9 taguchi design with welding speed, laser power, focal position and shielding gas blown angle as input parameters. Bead geometry (Bead width, depth of penetration), hardness were measured as performance characteristics. Technique for order of preference by ideal solution (TOPSIS) was employed for multi performance characteristics optimization and metallurgical aspects of the weld with highest relative closeness value are also discussed.
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