Product Code: ICA10_1204

High-Brightness Disk Laser Welding of Magnesium Alloys
Authors:
Mohamed Wahba, Central Metellurgical Research & Development Institute; Helwen Egypt
Masami Mizutani, Graduate School of Engineering, Osaka University; Osaka Japan
Yousuke Kawahito, Joining and Welding Research Institute, Osaka University; Osaka Japan
Seiji Katayama, Joining and Welding Research Institute, Osaka University; Osaka Japan
Presented at ICALEO 2010

The recent development of fiber and disk laser sources with excellent beam quality has increased the capability and enhanced the performance of the laser welding process. Compared to Nd:YAG and CO2 laser sources, this superior beam quality could be utilized to obtain higher welding speeds and deeper penetration, longer distance to the work piece and lower cost could be realized. Currently, the automotive industry is facing an increasing demand to increase fuel economy and reduce greenhouse gas emissions. Therefore, the trend is moving toward increasing the percentage of components made of lightweight structural materials such as magnesium alloys. In order to implement these materials, its critical to have the ability to produce defect-free welds with reproducible high quality. Laser beam welding is very promising in this regard. In this paper recent results of a study to understand the process phenomena during high brightness disk laser welding of magnesium alloys will be reported. After applying a wide range of process parameters, process windows indicating sound and defected welds have been constructed. Based on high speed camera observations, keyhole stability was assessed and the mechanism of defects formation was investigated. Finally, microstructure and mechanical properties of defect-free weld were analyzed.

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