A Comparison of Mechanical Properties and Microstructure in Friction Stir Welded and MIG Welded Light Alloys

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Abstract

Joining technologies are in a very interesting phase today due to some relevant innovationsconcerning new techniques. Friction Stir Welding (FSW) is a relatively new process, patented byTWI in 1991, able to weld through a solid state bonding materials considered difficult to be welded orunweldable by more traditional fusion welding techniques. By using this process welded joints areobtained with no external heat supplier, generating the required temperature increase by means of arevolving pin that follows a proper trajectory partially sunk in the workpiece surface. As for today,although first examples of industrial application can be found in the aeronautical and aerospace fields,the process is hardly applied for other sectors of the transportation industry, as the naval and theautomotive ones, in which traditional fusion processes as MIG or TIG are still used. In the paper acomparison between the mechanical and metallurgical properties of FSWed and MIG welded sheetsis carried out. In particular, two different thicknesses of AA5083 H321 aluminum alloy sheets,usually utilized for naval and marine applications, were utilized for the welds utilizing both theprocesses. The obtained results clearly highlight the supremacy of FSW in both mechanical resistanceand joint integrity.
Lingua originaleEnglish
Numero di pagine0
Stato di pubblicazionePublished - 2012

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