Effect of tool offsetting on microstructure and mechanical properties dissimilar friction stir welded Mg-Al alloys

Amir Hossein Baghdadi, Nor Fazilah Mohamad Selamat, Zainuddin Sajuri

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Automotive and aerospace industries are attempting to produce lightweight structure by using materials with low density such as aluminum and magnesium alloys to increase the fuel efficiency and consequently reduce the environmental pollution. It can be beneficial to join Mg to Al to acquire ideal performance in special applications. Friction stir welding (FSW) is solid state welding processes and relatively lower temperature of the process compared to fusion welding processes. This makes FSW a potential joining technique for joining of the dissimilar materials. In this study, Mg-Al butt joints were performed by FSW under different tool offset conditions, rotation rates (500-600 rpm) and traverse speeds (20 mm/min) with tool axis offset 1 mm shifted into AZ31B or Al6061 (T6), and without offset. During the welding process AZ31B was positioned at the advancing side (AS) and Al6061 (T6) was located at the retreating side (RS). Defect free AZ31B-Al6061 (T6) dissimilar metal FSW joints with good mechanical properties were obtained with the combination of intermediate rotation rate and low traverse speed pin is in the middle. When tool positioned in -1 mm or +1 mm offsetting, some defects were found in SZ of dissimilar FSWed joints such as cavity, tunnel, and crack. Furthermore, a thin layer of intermetallic compounds was observed in the stir zone at the interface between Mg-Al plates. The strength of the joint was influenced by FSW parameters. Good mechanical properties obtained with the combination of intermediate rotational speed of 600 rpm and low travelling speed of 20 mm/min by locating Mg on advancing side when pin is in the middle. Also, Joint efficiency of the welds prepared in the present study was between 29% and 68% for the different welding parameters.

Original languageEnglish
Article number012018
JournalIOP Conference Series: Materials Science and Engineering
Volume238
Issue number1
DOIs
Publication statusPublished - 23 Oct 2017

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Friction stir welding
Friction
Welding
Mechanical properties
Microstructure
Joining
Dissimilar metals
Dissimilar materials
Defects
Aerospace industry
Magnesium alloys
Automotive industry
Intermetallics
Aluminum alloys
Tunnels
Welds
Pollution
Fusion reactions
Cracks
Temperature

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

Cite this

Effect of tool offsetting on microstructure and mechanical properties dissimilar friction stir welded Mg-Al alloys. / Baghdadi, Amir Hossein; Mohamad Selamat, Nor Fazilah; Sajuri, Zainuddin.

In: IOP Conference Series: Materials Science and Engineering, Vol. 238, No. 1, 012018, 23.10.2017.

Research output: Contribution to journalArticle

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