Experimental investigation of bending and tensile strength of friction stir processed TIG-welded AA5083-H111 joint

Abstract

This paper reports on the experimental investigation of bending and tensile strength of the friction stir processed TIG-welded AA5083-H111 joint. The friction stir processed joint was studied comparatively with the TIG-welded joint (unprocessed joint). The TIG-welded joint was processed using a single-pass friction stir processing technique. The microstructural analysis revealed that the unprocessed joint was dominated with coarse grains while the refined grains dominated the friction stir processed joint. The unprocessed joint consistently failed at the center of the joint during tensile testing while the processed joint failed in different locations of the stir zone. The tensile strength of the unprocessed joint was found to be 47.4% to that of the base metal while that of the processed joint was found to be 76.5% to that of the base metal. The percentage elongation of the processed joint was found to be 82.4% to that of the base metal while that of the unprocessed joint was found to be 34.8% to that of the base metal. The bending failure mode of the processed and unprocessed joint was similar to that observed during tensile testing.

Correlation between Microstructure and Bending of FSW and TIG Welded Mg-Rich Aluminium Alloy Joints

“…The hexagonal tool pin profile with a 20 mm shoulder diameter, 7 mm probe diameter, and 5.8 mm pin length was used in conducting the FSW procedure (see figure 1 (a)). The tool profile was adopted from the literature [15]. The rotational tool speed of 1000 rpm and the traverse speed of 40 mm/min were adapted from previous studies [15,16].…”

“…The tool profile was adopted from the literature [15]. The rotational tool speed of 1000 rpm and the traverse speed of 40 mm/min were adapted from previous studies [15,16]. The TIG welding was conducted on a 60 o V-groove welding using ER5356 filler, and the parameters used are adopted from the literature [15].…”

“…The rotational tool speed of 1000 rpm and the traverse speed of 40 mm/min were adapted from previous studies [15,16]. The TIG welding was conducted on a 60 o V-groove welding using ER5356 filler, and the parameters used are adopted from the literature [15]. Figure 1 (b) show the TIG-welded plate while figure 1 (c) shows the friction stir welding of the plates.…”

“…The strain rate of 3mm/min was used in conducting the tensile tests. The bending setup is shown in figure 1(d Tool pin Threads a adopted from the literature [15,17]. The tensile and bending tests were performed on the specimens until they failed.…”

Post-weld friction stir processing of AA5083-F TIG welds with scandium added fillers

“…Silva [23] reported the impact of FSP on MIG weld of AA6082-T6 alloy, where a 6 mm plate is first MIG welded with ER5356 filler wire at voltage 26.6 V and current 160 amp and a V notch is made at an angle 90°and shielding was achieved with argon gas and found an enhancement in the fatigue properties due to the modification in the geometry of grain, grain size reduction and removal of defects. Msomi and Mabuwa [24] in their FSP on TIG welding of AA5083-H111 alloy, reporting on the formation of coarse grains in the unprocessed weld joints and very fine grains in the processed joint, concluded that the processed joints possessed improved tensile characteristics than unprocessed ones and the failure occurred at the center of the weld for unprocessed joints while it occurred at various locations on the stir zone (SZ) for processed joints.…”