Aluminum alloy welding is possible using GTAW. some of the recent trials can be searched online. Here are the few examples:

http://www.sciencedirect.com/science/article/pii/S1877705812003438

www.ijesit.com/Volume%202/Issue%205/IJESIT201305_36.pdf‎

www.aws.org/wj/supplement/wj0707-196.pdf‎

However use of Low power TIG called Micro TIG (works below 20A) can be a nice attempt for this sheets applications.

Best of luck for your Masters.......

Many regards for your intrest

You may see the following to get a good overview of Aluminium welding:

Liu, Y., Wang, W., Xie, J., Sun, S., Wang, L., Qian, Y., ... & Wei, Y. (2012). Microstructure and mechanical properties of aluminum 5083 weldments by gas tungsten arc and gas metal arc welding. Materials Science and Engineering: A,549, 7-13.

Singla, M., Singh, D., & Deepak, D. (2010). Parametric Optimization of Gas Metal Arc Welding Processes by Using Factorial Design Approach. Journal of Minerals and Materials Characterization and Engineering, 9, 353.

Praveen, P., Kang, M. J., & Yarlagadda, P. K. D. V. (2009). Arc voltage behavior in GMAW-P under different drop transfer modes. Journal of Achievements in Materials and Manufacturing Engineering, 32(2), 196-202.

Yarmuch, M. A. R., & Patchett, B. M. (2007). Variable AC polarity GTAW fusion behavior in 5083 aluminum. WELDING JOURNAL-NEW YORK-, 86(7), 196.

Mendez, P. F., & Eagar, T. W. (2001). Welding processes for aeronautics. Advanced Materials and Processes, 159(5), 39-43.

Mandal, N. R. (2001). Aluminum welding. Woodhead Publishing.

Rajasekaran, S. (1999). Weld Bead Characteristics in Pulsed GMA Welding of AI-Mg Alloys., Welding research supplement. (http://www.aws.org/wj/supplement/WJ_1999_12_s397.pdf)