Abstract:As part of an ongoing process to fully assess the potential for friction stir welding (FSW) to be used in the aerospace industry, an attempt was made to produce double sided FSW joints at traverse speeds equal or higher than 5 mm/s of AA2050-T84 12.7 mm thick plates for high-volume production applications. With an emphasis on weld quality, the local and global mechanical properties were evaluated and correlated with microstructure of the welding area. Sound welds with no volumetric defects were obtained for to… Show more
“…In the past few decades, the application of aluminum alloys in the industrial sector has increased by 90% [ [1] , [2] , [3] , [4] , [5] , [6] ]. Despite the thickness reduction, flashes and keyholes are formed in FSW joints [ 7 ].…”
“…In the past few decades, the application of aluminum alloys in the industrial sector has increased by 90% [ [1] , [2] , [3] , [4] , [5] , [6] ]. Despite the thickness reduction, flashes and keyholes are formed in FSW joints [ 7 ].…”
“…Unique features of magnesium (Mg) and its alloys including excellent properties of damping, reasonable specific stiffness, larger specific strength, meager density etc., make them more preferable in automotive, marine, aerospace, biomedical and electronic industrial sectors [1][2][3][4] . At the same time, alloys of Mg due to their certain elemental properties cannot be easily joined using the classical fusion-based welding methodologies 5,6 .…”
Effect of two distinctive tool designs along with other tool related parameters including speed of traverse of tool and offset distance of tool pin during friction stir welding of dissimilar AZ91C and AZ31B alloys of Mg were investigated. Experimental recordings revealed that all the joints fabricated during 1 st set of investigations employing cylindrically tapered pin geometry and their offset distances being 0.5 mm or 1mm towards any one of the parent metals possessed flaws. Joint No: II-3 fabricated in 2 nd set of investigations by employing 15mm diameter inner shoulder tool with threaded cylindrical tapered pin geometry at a tool offset distance of 0 mm was found be free from flaws. This joint exhibited a tensile strength of 186 MPa which was 78.81% of AZ91C and 70.72% of another parent metal AZ31B. Existence of intermetallic phased constituents, namely, Mg 17 Al 12 in several regions of fractured surfaces have contributed to the supplementary brittleness in the zone of nugget, and have reduced the tensile strength of the joint.
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