| Summary: | 碩士 === 國立交通大學 === 工學院碩士在職專班精密與自動化工程組 === 98 === Traditional ways of power generation such as natural gas, coal, nuclear and other power generation methods, the resulting pollution can not be ignored, and the generated carbon dioxide, also produced changes in the environment, resulting in worsening the greenhouse effect, so how to reduce carbon dioxide emissions has become a Item difficult issues, making the fuel cell area for discussion of the direction, so as to promote the development of hydrogen storage and application of related technologies, which is to promote hydrogen storage products towards precision, lightweight, high-quality, high strength-based and high-capacity and so on trend.
This study investigated the use of aluminum alloy 7075 (Al-Zn-Mg) as a hydrogen bottle of materials, main features of high strength and excellent corrosion resistance, while use of tungsten inert gas arc welding (GTWA) to fill welding, and Taguchi method aspect ratio, melting area to get the best parameters and welding conditions of different locations, while at the solution treatment after welding + artificial aging heat treatment, for with / without weld metal and welding filler after / no heat
treatment the mechanical properties of tensile, hardness, microstructure were discussed.
The results in the 3mm thickness of the specimen obtained by Taguchi method optimal welding parameters, and thus parameters and then derived from the welding gas cylinder, and finally with the ultimate style cover welding and hydraulic test results by up to 20Kg / cm2, to achieve design goals, and by heat treatment after welding, micro-hardness of the weld, by approximately 43%, tensile strength also raise about 20%, while by ER5356 welding filler, the overall mechanical properties are better than not filling weldment.
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