Effect of Cu addition on laser welding performance of Al-Mn-Mg alloy sheets

The present study investigated the effect of Cu addition on the tensile properties and laser welding performance of Al (1·3 mass-%)-Mn (0·5 mass-%)-Mg alloy sheets. It was found that the addition of Cu in the Al-Mn-Mg alloy sheets increased the ultimate tensile strength; however, the laser welding p...

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Bibliographic Details
Published in:Materials research innovations 2014-07, Vol.18 (sup4), p.S4-239-S4-243
Main Authors: Zhao, P. Z., Pan, Y. F., Shi, S. J., Jiang, T., Wu, X. X., Feng, Y. J.
Format: Article
Language:English
Subjects:
Al-Mn-Mg alloy
Alloying additive
Aluminum
ALUMINUM ALLOYS (50 TO 99 AL)
Aluminum base alloys
BOUNDARIES
Copper
CRACKS
Cu addition
Grain boundaries
Laser beam welding
LASER WELDING
Laser welding performance
LASERS
TENSILE STRENGTH
Ultimate tensile strength
WELDING
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Summary:The present study investigated the effect of Cu addition on the tensile properties and laser welding performance of Al (1·3 mass-%)-Mn (0·5 mass-%)-Mg alloy sheets. It was found that the addition of Cu in the Al-Mn-Mg alloy sheets increased the ultimate tensile strength; however, the laser welding performance deteriorated. The addition of Cu up to 0·45 mass-% induced the laser welding cracking. Observations of the microstructure indicated that residual Cu bearing eutectic phases existed along the grain boundaries in the alloy with 0·45 mass-%Cu, which decreased the ductility of the grain boundaries and resulted in the formation of cracks along the grain boundaries during the solidification process after laser welding.
ISSN:1432-8917
1433-075X
DOI:10.1179/1432891714Z.000000000685