Abstract
This article presents a study on optimization of multi performance characteristics using grey relational analysis (GRA) in laser welding of NiTinol shape memory alloys. Bead on plate welding was done on NiTinol plates of 1 mm thickness using Ytterbium: Yttrium aluminium garnet (Yb: YAG) laser welding process. The experiment was carried out on the basis of Taguchi L9 Design with welding speed, Shielding gas blown distance, focal position and power as input parameters. Bead geometry (Depth of penetration, bead width) and microhardness were measured as performance characteristics. Analysis of variance (ANOVA) was utilized for calculating individual parameter percentage contribution on the multi performance characteristics. It was found that welding speed as the most influential parameter on the multi performance characteristics followed by shielding gas blown distance, power and focal position. The metallurgical aspects of the optimized weld are also discussed with help of microstructure.
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