Dissimilar laser welding of an AA6022-AZ31 lap-joint by using Ni-interlayer: novel beam-wobbling technique, processing parameters, and metallurgical characterization
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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier Ltd
2019
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/23244/ http://umpir.ump.edu.my/id/eprint/23244/ http://umpir.ump.edu.my/id/eprint/23244/ http://umpir.ump.edu.my/id/eprint/23244/1/%28Khodabakhshi%2C%202019%29%20Dissimilar%20laser%20welding%20of%20an%20AA6022-AZ31%20lap-joint%20by%20using%20Ni-interlayer%20Novel%20beam-wobbling%20technique%2C%20processing%20parameters%2C%20and%20metallurgical%20characterization.pdf |
| Summary: | 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. |
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