Parameter optimization for laser welding of dissimilar aluminum alloy: 5052-H32 and 6061-T6 considering wobbling technique

Autor: Herinandrianina Ramiarison, Christopher Pilcher, Francois Nadeau, Noureddine Barka, F. Mirakhorli
Rok vydání: 2021
Předmět:
Zdroj: The International Journal of Advanced Manufacturing Technology. 118:4195-4211
ISSN: 1433-3015
0268-3768
DOI: 10.1007/s00170-021-08122-y
Popis: The wobbling technique which consists of oscillating the laser beam at high frequency and in a specific pattern is an innovative way to enhance the quality of weld. The wobbling widens the area covered by the laser beam resulting in a wider seam that provides improved mechanical properties. The study investigated the effect of parameters such as the laser power, the gap between the two butt-welded plates, and the amplitude of oscillation using Taguchi’s method by setting a L9 design of experiments. The laser power level has a low range as the spot diameter is kept at a very small size to increase the power density and improve the energy efficiency of the laser welding process. The results revealed the optimal welding set-up and conditions to enhance the mechanical properties of welds. The value of laser power and the amplitude is optimized relatively to the ultimate tensile strength and the weld shape expressed by the depth to width ratio (D/W) that is correlated to the ductility. A fitness function combined with the steepest descent method applied to regression analysis allows figuring out the optimal parameters defined by the value of laser power at 1118 W and an amplitude of 0.8 mm resulting in a predicted welded part with 206.8 MPa of tensile strength and 4.5% of ductility.
Databáze: OpenAIRE
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