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Effects of overlapping formed via pin-offsetting on friction stir weldability of AA7075-T651 aluminum alloy

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Abstract

In this study, AA7075-T651 aluminum alloy was joined by friction stir welding (FSW) method, using two different pin offset values, and the microstructure, macrostructure, mechanical properties of welded joints were examined. The tensile strength, elongation at rupture, and bending strength of welded joints were measured in the ranges of 236-408 MPa, 0.3-5.7 % and 110-574 MPa, respectively. Tensile test results revealed that the highest tensile strength of 408 MPa was obtained with the process parameters of 630 rpm tool rotational speed (TRS) and 0 mm pin offset. It is worth noting that joints, welded with a TRS of 800 rpm in the same manner, i.e., the pin was positioned at zero offset, exhibited the lowest tensile strength, with a value of 236 MPa. Microstructural and macrostructural observations revealed that welded joints exhibiting lower tensile strength and elongation at rupture consist of various types of defects (e.g. tunnel and cavity). Defect-free joints were fractured at a region between heat affected zone (HAZ) and base metal; however, welded joints with variety of defects were fractured through HAZ.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Dokuz Eylul University, 35397, Izmir, Turkey

    Şefika Kasman

  2. Department of Mechanical Engineering, Yozgat Bozok University, 66100, Yozgat, Turkey

    Sertan Ozan

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  1. Şefika Kasman
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  2. Sertan Ozan
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Correspondence to Şefika Kasman.

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Recommended by Associate Editor Young Whan Park

Sefika Kasman received her Ph.D. degree in Mechanical Engineering from Ege University, Turkey in 2010. Since 2017, she has been appointed as Associate Professor in the Department of Mechanical Engineering of Dokuz Eylul University, Turkey. Her research interests include aluminum casting, laser milling, laser surface processing and friction stir welding.

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Kasman, Ş., Ozan, S. Effects of overlapping formed via pin-offsetting on friction stir weldability of AA7075-T651 aluminum alloy. J Mech Sci Technol 33, 819–828 (2019). https://doi.org/10.1007/s12206-019-0138-z

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  • DOI: https://doi.org/10.1007/s12206-019-0138-z

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