Influences of tool pin profile and welding speed on the formation of friction stir processing zone in AA2219 aluminium alloy

Developing a friction-stir welding window for joining the dissimilar aluminum alloys AA6351 and AA5083

“…More heat input destroys the regular flow behaviour of plasticized material and a higher rotational speed causes the excessive release of stirred materials to the upper surface, which leaves voids in the weld zone. 16,17 The lowest and highest welding speed produces defects due to the increased frictional heat and insufficient frictional heat generated, respectively. 18 In general FSW at higher welding speeds results in a short exposure time in the weld area with insufficient heat and poor plastic flow of the metal and causes some voids, like defects, in the joints.…”

Effect of tool pin profile on mechanical properties of Al6082 and Al6082-Cu composite by friction stir processing

“…The greater strength obtained using threaded cylindrical profile is again attributed to the whirling action of revolving threads of threaded cylindrical profile which was absent in case of square profile. Also at the given combination of rotational speed (1000rpm) and traverse speed (16mm/s), the eccentric stirring of square profile [10] became less effective compared to the whirling action of threaded cylindrical profile. The higher strengths of the composite specimens compared to the specimens processed without reinforcement is explained with the help of Orowan Theory [5,11].…”

Effect of Welding Speed on Mechanical Properties of Dissimilar Friction Stir Welded AA5083-H321 and AA6061-T6 Aluminum Alloys

“…The reduction in frictional heat production with an increase in welding speed was observed. Higher heat conditions prevail at lower welding speeds with slower cooling rate, which leads to coarsening of grains and dissolution of precipitates [10,18] Lower welding speeds cause uncalled for solidification of material, which leads to the reduction in UTS attributable to the defect. The mixing gets to be distinctly lacking at higher welding speeds.…”

“…STEUWER et al [9] measured the impact of traverse speed and tool rotational speed on the residual stresses of 3 mm-thick AA6082 and AA5083 joints. ELANGOVAN and BALASUBRAMANIAN [10] announced that the welding speed has a more prominent impact on the tensile strength. YAN et al [11] concentrated the dissimilar friction stir welding between AZ31 and AA5052 magnesium alloy and revealed that at the highest point of the mixing zone, AZ31 and AA5052 alloys are simply bonded, while onion ring structure which consisted of magnesium bands and aluminum bands is formed at the bottom of the stir zone.…”