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Joints of high tensile aluminum alloys can enhance design flexibility for various structures. Al-Cu alloy is an extensively used high tensile material. However, the conventional fusion welding of Al-Cu alloy is less weldable than Al-Mg alloys.
In the present study, YAG laser, Disk laser Plasma welding and friction stir welding are produced for Al-4%Cu alloys of 0.8 mm in thickness. This research has been investigated by tensile, hardness and impact tests, and observation of imperfection and microstructure. Weldability of Disk laser beam welds is higher than other power beam processes. Mechanical properties are influenced beam quality. Weld metals are shown fine structure and segregation of element is not recognized. Friction stir welds shows high impact properties and fracture position of drop impact test is base metal.
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