[Kovove materialy - Metallic materials]
    Wed - December 02, 2020 - 14:26 No. of hits : 1197747 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 54 (2016), Issue 4

Effect of welding speed on the mechanical properties and weld defects of 7075 Al alloy joined by FSW
vol. 54 (2016), no. 4, pp. 241 - 247

In this study, 7075-T651 Al alloys were joined by friction stir welding (FSW) at a fixed rotational speed and different welding speeds. The stirring tool used in the welding processes was comprised of a shoulder of 20 mm in diameter and modified M6 × 1 HSS hand taps used as pins. The FSW was performed at a rotational speed of 1600 rpm and at welding speeds of 20, 40, and 60 mm minĖ1. Mechanical and metallographic tests were carried out on the welded joints and the effects of the welding speed on the mechanical and metallurgical properties of the welded specimens were investigated. Welding speed significantly affected the microstructure and mechanical properties of the joining. Results showed that the average grain size of the weld nugget was reduced as welding speed was increased. In addition, it was found that high welding speed negatively affected the mechanical properties of the weld nugget.

Key words
FSW, aluminium alloy, mechanical properties, micro defects, microstructure

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Full title of this journal is bilingual: Kovovť materiŠly - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.

Article abstracts updated: 2020-11-03 07:52 †††††
Articles in press revised: 2020-10-30 12:09 ††††
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