Abstract:The aim of this study is to investigate the effect of keeping constant the tool rotational speed to the welding speed ratio (υ ratio) on the mechanical properties of the dissimilar friction stir welding of EN AW6082-T6 and EN AW5083-H111. Two different pins shaped as triangular and pentagonal were associated with the constant υ ratio. From the tensile test results, it was found that the υ ratio does not create an evident change in the weld joint strength. The small cavity-and tunnel-type defects were observed at the nugget zone and located on the advancing side of the pin. These defects caused a decrease in the strength and elongation of the weld joint. The most important inference obtained from the experimental results is that if the υ ratio is kept constant, the weld joint strength for each weld does not correspond to a constant value.
In the present study, the effect of two different pins which shaped in the triangular and straight helical threaded were associated with the ratio of the tool rotational speed to the welding speed on the mechanical properties of dissimilar friction stir welding (FSW) of EN AW 6082 and EN AW 5754. The responses of FSW process were investigated by the UTS, Ɛ% and hardness of weld joint. The results showed that the ratio of the tool rotational speed to the welding speeds have a dominant effect on the weld joint strength.
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