Contribution to the Laser Welding of Wrought and Spray-Compacted Aluminum Alloys and the Impact of the Alloy Composition on the Welding Microstructure

Cw‐laser weldings at different power, focal position, and welding velocity were performed on hypereutectic spray‐compacted aluminum alloys and AlMg3. Two light‐conducting cables, 0.1 and 0.4 mm in diameter were used. For AlMg3 shrink pores were observed for a broad range of parameters. However, for...

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Bibliographic Details
Published in:Advanced engineering materials 2014-08, Vol.16 (8), p.1052-1065
Main Authors: Gietzelt, Thomas, Eichhorn, Lutz, Wunsch, Torsten, Gerhards, Uta, Przeorski, Thomas, Weiss, Holger, Dittmeyer, Roland
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
Microstructure
Porosity
Seams
Thermal conductivity
Welded joints
Welding
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Summary:Cw‐laser weldings at different power, focal position, and welding velocity were performed on hypereutectic spray‐compacted aluminum alloys and AlMg3. Two light‐conducting cables, 0.1 and 0.4 mm in diameter were used. For AlMg3 shrink pores were observed for a broad range of parameters. However, for a narrow window pore free weldings seem possible. For comparison, the spray‐compacted hypereutectic aluminum alloys (AlSi17Fe4Cu2.5MgZr, AlSi20Fe5Ni2, and AlSi35Fe2Ni) were welded in extruded condition. The metallographic microstructure is very different and may support crack free weld seams. The results emphasize the impact of the energy density. Since for aluminum even small amounts of alloying elements change the heat conductivity drastically, all parameters have to be adjusted carefully. CW‐laser welding experiments are performed at different power, focal position and velocities using two optical fibers. As materials, AlMg3 and spray‐compacted hypereutectic aluminum alloys with silicon contents of 17–35% are used. For AlMg3, shrink pores were observed for a broad range of parameters whereas defect‐free weld seams with specular precipitations are observed for the hypereutectic aluminum alloys.
ISSN:1438-1656
1527-2648
DOI:10.1002/adem.201300497