Controllability of joint integrity and mechanical properties of friction stir welded 6061-T6 aluminum and AZ31B magnesium alloys based on stationary shoulder

Abstract

In order to improve joint integrity and reduce the amount of intermetallic compounds (IMCs), 6061-T6 Al and AZ31B Mg alloys were successfully joined by stationary shoulder friction stir welding (SSFSW). The stationary shoulder effectively enhanced the joint surface integrity and reduced the thickness reduction of the Al/Mg joint. The elimination of pin adhesion was beneficial to increasing material transfer and then improving interfacial joining length of Al/Mg joint. Extremely thin IMCs layer could be achieved because of the heat sink induced by the stationary shoulder. The maximum tensile strength of the Al/ Mg joint reached 137 MPa at a welding speed of 60 mm/min, rotating velocity of 1000 rpm and offset to Mg sheet of 0.3 mm, which was 130% higher than that of conventional joint. SSFSW is feasible and has the potential to join dissimilar materials with the formation of IMCs, such as Al/Mg alloys, Al/copper alloys, Al/titanium alloys and so on.

Friction stir welding of aluminium to magnesium: A critical review

“…The lap joints for the stationary shoulder have maximum shear load of 5.8KN, which is higher than that of the joints without stationary shoulder. Subsequently, the stationary shoulder is also successfully used for the Al/Mg butt joints [99]. The stationary shoulder can effectively prevent the outflow of plastic material.…”

Friction stir-welding of AZ31B Mg and 6061-T6 Al alloys optimization using Box-Behnken design (BBD) and Artificial Neural network (ANN)

“…The findings revealed that rotational speeds influence the parameters and tensile characteristics increased and subsequently declined as welding speed increased. The maximum tensile strength was 137 MPa at a welding speed of 60 mm/min [6]. The purpose of the study was to investigate the microstructural and corrosion behavior of FSW joints between a 6061 Al and AZ31 Mg with a zirconium interlayer.…”

The Influence of the Mechanism of Double-Sided FSW on Microstructure and Mechanical Performance of AZ31 Alloy

“…The magnesium alloys have been widely used in the manufacture of aviation, automobile, and other fields, due to superior properties, such as high specific strength, good damping capacity, and easy recycle [1][2][3][4][5]. However, magnesium alloys have poor workability caused by the limited number of slip systems associated with a hexagonal, close-packed crystal structure [6].…”