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Mechanical Strength Of Dissimilar AA7075 and AA6061 Aluminum Alloys Using Friction Stir Welding

机译：搅拌摩擦焊接不同AA7075和AA6061铝合金的机械强度

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摘要

The present study focuses on the effects of material position and tool rotational speed on the tensile strength of dissimilar AA7071 and AA6061 welded aluminum alloys with a thickness of 2.0 mm in using a conventional milling machine. Ten joints were produced by varying tool rotational speeds and by changing the fixed position of the material on the advancing and retreating sides. The results show that the maximum tensile strength of 207 MPa was achieved for Sample E when AA6061 aluminum alloys were placed on the advancing side at a rotational speed of 1000 rpm with seamless surface appearance and no inner defect across the weld area, while the lowest tensile strength of 160 MPa was obtained for Sample F when AA6061 was placed on the retreating side with severe tunnel defects across the weld area contributing to crack propagation. Thus, inuddissimilar welding, weaker materials should be placed on the advancing side to trigger heat from the tool rotation and smooth the material flow formation in the stirred zone.ud
机译：本研究着眼于材料位置和工具转速对使用传统铣削机加工厚度为2.0 mm的不同AA7071和AA6061焊接铝合金的抗拉强度的影响。通过改变工具的旋转速度以及通过改变前进和后退侧的材料的固定位置来制作十个接头。结果表明，当将A6061铝合金以1000 rpm的转速置于前进侧时，样品E的最大抗拉强度达到207 MPa，表面无缝，且整个焊接区域无内部缺陷，而最低拉伸强度当AA6061放置在后退侧时，样品F的最大强度为160 MPa，且整个焊接区域的隧道缺陷严重，从而导致裂纹扩展。因此，在异种焊接中，应将较弱的材料放在前进的一侧，以触发工具旋转产生的热量，并使搅拌区中的材料流动形成顺畅。

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