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J Weld Join > Volume 31(2); 2013 > Article
Journal of KWJS 2013;31(2):63-68.
DOI: https://doi.org/10.5781/KWJS.2013.31.2.63    Published online June 5, 2013.
The Weldability of the Dissimilar Magnesium Alloy Welded by Fiber Laser
Jong-Do Kim, Young-Sik Kim, Mook-Keun Song, Jung-Han Lee
Magnesium alloys have gained increased attention in recent years as the structural materials, because of their attractive properties such as good specific strength, excellent sound damping capability. However, to expand their applications, a reliable joining process is absolutely necessary. In this study, a CW fiber laser was used to investigate the lap weldability of sand casting and wrought magnesium alloys. The effect of defocused distance on lap weldability was examined, and it was found that spatters always generated at the around focused distance because of the high power density of the laser beam. Thus, defocused distance was required to obtain sound welds. In addition, the application of fillet welding was evaluated for minimizing the affect of sand casting magnesium alloy that have relatively poor weldability. As a result of this study, we could confirm good weldability without weld defects.
Key Words: Sand casting magnesium alloy, Wrought magnesium alloy, Fiber laser, Lap welding, Fillet welding

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