دانلود پایان نامه به زبان انگلیسی: تعمیر و نگهداری قطعات جوشی در محیط فضا

عنوان پایان نامه ای که در این بخش برای شما قرار داده ایم Welded Repair and Maintenance in the Space Environment (تعمیر و نگهداری قطعات جوشی در محیط فضا) می باشد که توسط جناب آقای Vasilios Nikou از آکادمی دریایی Hellenic یونان در سال 2003 میلادی تهیه شده است. در ذیل چکیده این پایان نامه که به زبان انگلیسی است را مشاهده می کنید:

The feasibility of using earth bounded welding techniques in the space environment has been investigated. A literature survey on welding in space reveals numerous aspects about the work done in different countries. The survey indicates the need of a more detailed focus, since no welding experiments have been performed in space since July 1984 (Salyut-7). Addressing the peculiarities of different welding processes, such as environmental restrictions, helped in evaluating and analyzing the selected processes. In order to study the use of a welding process, one should also analyze the ways to test the welds produced. Consequently, non-destructive testing (NDT) techniques with potential use in the space environment were evaluated. A comparison of the various NDT techniques showed parameters, which had not been previously considered, for instance materials to be welded and type of welding processes to be used. The most probable candidates for use in the space environment were ultrasonic, radiographic and eddy current techniques. Even though mathematical modeling is not the main part of the thesis, an existing model was used in order to examine the impact of gravity on defect formation, and humping in particular, in the welding pool. Different results were generated for the Earth environment as well as the simulated space environment inside a spacecraft.

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