| Summary: | 碩士 === 國立臺灣師範大學 === 工業教育研究所 === 87 === Abstract
Because the characteristics of high “strength to weight” ratio, easy formability and good corrosion resistance, aluminum alloys have been used extensively in industry. The purpose of this research was to systematically study the weldability of aluminum alloys weldments under Gas Tungsten Arc welding (GTAW). The base metal used was non-heat treatable aluminum alloy 1050 with filler metal of ER4043. A series of experiments including microhardness testing, tensile testing, optical metallography and SEM analysis were conducted to determine the effect of cold working on the mechanical properties and microstructures of the aluminum alloy 1050 weldment.
A series of experiment results indicated that the base metal and weldment under cold working can reduce their elongation slightly, however, their ultimate tensile strength and microhardness can be enhanced. SEM observations showed that the tensile tested specimen has a ductile fracture surface.
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