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Open AccessArticle

Microstructure and Solidification Crack Susceptibility of Al 6014 Molten Alloy Subjected to a Spatially Oscillated Laser Beam

1
Welding and Joining Research Group, Korea Institute of Industrial Technology, 7-47, Songdodong, Yeonsugu, Incheon 21999, Korea
2
Department of Materials Science and Engineering and RIAM, Seoul National University, Seoul 08826, Korea
*
Author to whom correspondence should be addressed.
Materials 2018, 11(4), 648; https://doi.org/10.3390/ma11040648
Received: 29 March 2018 / Revised: 19 April 2018 / Accepted: 19 April 2018 / Published: 23 April 2018
(This article belongs to the Special Issue Laser Materials Processing)
Oscillating laser beam welding for Al 6014 alloy was performed using a single mode fiber laser and two-axis scanner system. Its effect on the microstructural evolution of the fusion zone was investigated. To evaluate the influence of oscillation parameters, self-restraint test specimens were fabricated with different beam patterns, widths, and frequencies. The behavior of hot cracking propagation was analyzed by high-speed camera and electron backscatter diffraction. The behavior of crack propagation was observed to be highly correlated with the microstructural evolution of the fusion zone. For most oscillation conditions, the microstructure resembled that of linear welds. A columnar structure was formed near the fusion line and an equiaxed structure was generated at its center. The wide equiaxed zone of oscillation welding increased solidification crack susceptibility. For an oscillation with an infinite-shaped scanning pattern at 100 Hz and 3.5 m/min welding speed, the bead width, solidification microstructure, and the width of the equiaxed zone at the center of fusion fluctuated. Furthermore, the equiaxed and columnar regions alternated periodically, which could reduce solidification cracking susceptibility. View Full-Text
Keywords: laser welding; single mode laser; beam oscillation; Al alloy; solidification cracking susceptibility; microstructure; solidification morphology laser welding; single mode laser; beam oscillation; Al alloy; solidification cracking susceptibility; microstructure; solidification morphology
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MDPI and ACS Style

Kang, M.; Han, H.N.; Kim, C. Microstructure and Solidification Crack Susceptibility of Al 6014 Molten Alloy Subjected to a Spatially Oscillated Laser Beam. Materials 2018, 11, 648.

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