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Investigation of Wire Arc Additive Manufacturing of nano-treated 7075 aluminum alloy
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- Author / Creator
- Teng, Shiyu
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This novel study makes it possible to manufacture high-quality, large-size 7075 aluminum alloy parts through additive manufacturing. The study comprehensively investigates the process and the control of the quality of the nano-treated 7075 aluminum alloy part manufactured by the in-situ multi-sensor Cold Metal Transfer (CMT) Wire Arc Additive Manufacturing (WAAM) system. A complete research flow, including equipment and environment setup, measurement calibration, process parameter exploration, and quality control, is presented in this study. To achieve the research in this research flow, five sub-studies were performed. An in-house in-situ multi-sensor WAAM system (referred to as WAAM system) was first built with the ability to conduct the WAAM printing process, and monitor and record the temperature during the printing process, layer’s contour geometry, and energy input in-situ. To ensure the temperature measured and recorded in this study is correct, calibration work on the emissivity of the WAAM-made 7075NT aluminum wall was done. A full-factorial screening experiment was then designed and carried out to screen out the vital process parameters that significantly affect the geometrical properties. Next, the screened parameters are used to find the parameter set that leads to sound layer geometry and the lowest energy consumption. Finally, two heat management strategies, Critical Dwell Time and Critical Interpass Temperature, are applied in the CMT-base WAAM process to validate the weldability of 7075NT aluminum alloy and investigate how these two strategies affect and control the thermal state, and the geometrical and mechanical properties of the parts.
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- Subjects / Keywords
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- Graduation date
- Spring 2023
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.