A Case Study for the Welding of Dissimilar EN AW 6082 and EN AW 5083 Aluminum Alloys by Friction Stir Welding

Abstract

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.

Friction Stir Welding of Dissimilar Aluminum Alloy Combinations: State-of-the-Art

“…It is therefore recommended to use a cylindrical or a conical pin profile with various features in the dissimilar Al alloy joints for good material flow to produce sound joints. [18], with permission from SAGE, 2018; (d) AA5083-AA6082 [34], with permission from the authors; (e) AA5083-AA6351 [57], with permission from Springer, 2013.…”

“…Recently, a comprehensive EBSD investigation for the AA5083-AA2024 joint was reported by Niu et al [91], as shown in Figure 9. As it can be seen from the EBSD orientation maps (Figure 9 a-d), tilted and elongated grains in the TMAZ and fine grains d in the SZ developed due to dynamic [14], with permission from Springer, 2018; (b) AA5083-AA7075, reproduced from [16], with permission from Springer, 2018; (c) AA5083-AA6351, reproduced from [18], with permission from SAGE, 2018; (d) AA5083-AA6082 [34], with permission from the authors; (e) AA5083-AA6351 [57], with permission from Springer, 2013.…”

“…Evidence of fine grain size, fine distribution of Si particles and reduced residual stresses in the SZ were found for low rotation and welding speeds. Together with rotation and welding speeds, the effect of tool geometry like the pin profile or features [14,18,47,48,62], pin shapes [34,57] and shoulder diameter to pin diameter ratio [37,60] on joint strength have been investigated. The pin profile or feature controls material flow and in effect material mixing at the joint interface, the pin shape affects SZ size as well as material movement and the shoulder to pin diameter ratio controls frictional heat generation between the tool and the BM.…”

Microstructure and Mechanical Properties of Dissimilar Friction Stir Welded Joint AA7020/AA5083 with Different Joining Parameters

“…The selected samples include A7A5-2-8 with the best strength properties, samples A7A5-3-12, which was rejected from the strength tests due to a defect, and sample A7A5-1-4 with medium strength properties. Similarly, Kasman et al [ 27 ] conducted analyses of the constant ω/v ratio for connections of dissimilar alloys and obtained both correct and defective welds. The samples with the same HIR index have a different Heat Input Index (HI), which is 0.32 for the sample with the best parameters, with average values of 0.16, the piece disqualified from the tests 0.48.…”

Machining of Inserts with PCD Cutting-Edge Technology and Determination of Optimum Machining Conditions Based on Roundness Deviation and Chip-Cross Section of AW 5083 AL-Alloy Verified with Grey Relation Analysis

“…This reduces the weight of the engine while increasing the corrosion resistance. The use of the material EN AW 5083 can also be found in shipbuilding or hydraulic lines in aircraft [14][15][16].…”