Tensile Properties and Their Heterogeneity in Friction Stir Welded Joints of a Strain Hardened Aluminum Alloy(Materials, Metallurgy & Weldability)

概要

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A strain hardened aluminum alloy AA1050-H24 was friction stir welded in order to study the tensile properties and their heterogeneity of the joints. Experimental results showed that the tensile properties of the joints are significantly affected by the welding parameters. The optimum FSW parameters can be determined from the relation between the tensile properties and the welding parameters, and the maximum ultimate-strength of the joints is equivalent to 80% that of the base material. When the welding parameters deviate from the optimum values, a crack-like defect or serious softening is produced in the joints, thus the tensile properties of the joints deteriorate. In addition, the tensile properties of the joints are also heterogeneous. In the upper, middle and lower parts of each joint, the middle part is weakest and the upper part is strongest in tensile properties. On the two sides of the weld center, the tensile properties on the advancing side are inferior to those on the retreating side. These results are attributed to the different thermo-mechanical effects on the different component parts of the joints.
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