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Dissimilar laser welding of an AA6022-AZ31 lap-joint by using Ni-interlayer: novel beam-wobbling technique, processing parameters, and metallurgical characterization

Khodabakhshi, Farzad and L. H., Shah and Gerlich, Adrian (2019) Dissimilar laser welding of an AA6022-AZ31 lap-joint by using Ni-interlayer: novel beam-wobbling technique, processing parameters, and metallurgical characterization. Optics & Laser Technology, 112. pp. 349-362. ISSN 0030-3992

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(Khodabakhshi, 2019) Dissimilar laser welding of an AA6022-AZ31 lap-joint by using Ni-interlayer Novel beam-wobbling technique, processing parameters, and metallurgical characterization.pdf
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Abstract

In this article, the weldability of dissimilar lap joints between 2 mm thick sheets of AA6022 aluminum (bottom) and AZ31 magnesium alloys (upper) was studied using a fiber laser with a wobbling scanner. The effects of laser beam wobbling parameters, laser power, traveling speed, and the presence of a pure nickel interlayer (∼0.1 mm thickness) is evaluated based on the microstructures and phases produced. The experimental results revealed dissimilar joint formation is highly dependent on inter-mixing, as well as fusion zone dimensions which control Al- and Mg-rich interaction zones that vary with laser power. Sound dissimilar joints were only produced by penetrating the Mg-rich interaction zone into the aluminum alloy. Joint formation benefited from suppression of Al-Mg chemical reactions using a Ni-interlayer, providing more well-dispersed and more benign phases compared to Al-Mg intermetallics at the interface during welding. The application of laser beam wobbling on a circular path with diameter of ∼0.4 mm and frequency of 1000 Hz served to reduce cracks and enhanced materials intermixing.

Item Type: Article
Additional Information: Indexed by SCOPUS
Uncontrolled Keywords: AA6022 aluminum alloy; AZ31 magnesium alloy; Beam wobbling; Dissimilar laser joining; Ni-interlayer; Processing parameters
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TN Mining engineering. Metallurgy
Faculty/Division: Faculty of Mechanical Engineering
Depositing User: Mr. Luqman Hakim Ahmad Shah
Date Deposited: 22 Feb 2019 04:25
Last Modified: 22 Feb 2019 04:25
URI: http://umpir.ump.edu.my/id/eprint/23244
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