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


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.

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Availability of data and material

Data available on request from the authors.



Aluminum alloy

Adj MS:

Adjusted mean squares

Adj SS:

Adjusted sum of squares




Analysis of variance


American Society for Testing and Materials


Base metal


Depth to width ratio


Degree of freedom


Energy dispersive X-ray spectroscopy


Fusion zone


Defect measurements


Heat-affected zone


Tetrafluoroboric acid


Vickers hardness


Degree Kelvin















N amp :

Amplitude normalized value

N LP :

Laser power normalized value

N uts :

Ultimate tensile strength normalized value


Optical microscope


Coefficient of determination




Standard cubic feet per hour

Seq SS:

Sequential sum of squares




Silicon carbide




Ultimate Tensile Strength





w 1 :

Importance weight of tensile strength

w 2 :

Importance weight of laser power

w 3 :

Importance weight of amplitude

 ∝ n:

Iteration interval steps




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The authors would like to acknowledge Eric Stiles et Garrett Larrimore from IPG Photonics, Novi (MI), USA, for the completion and assistance to laser welding experiments.

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Herinandrianina Ramiarison and Noureddine Barka are at the origin of this research project by proposing the approach and the methodology to address the problematic. Chris Pilcher with his team carried out all the welding experiments. Fatemeh Mirakhorli and François Nadeau brought their expertise in the aluminum field and metallurgy in results analysis. All authors discussed the results and contributed to the final manuscript.

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Correspondence to Herinandrianina Ramiarison.

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Ramiarison, H., Barka, N., Mirakhorli, F. et al. Parameter optimization for laser welding of dissimilar aluminum alloy: 5052-H32 and 6061-T6 considering wobbling technique. Int J Adv Manuf Technol (2021).

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  • Beam wobbling
  • Laser welding
  • Aluminum alloys
  • Taguchi and ANOVA method
  • Microstructure characterization
  • Mechanical property