Influence of in-process cooling on tensile behaviour of friction stir welded joints of AA7039

Enhancing mechanical properties of friction stir welded 2219Al-T6 joints at high welding speed through water cooling and post-welding artificial ageing

“…For FSW precipitation-hardened (2xxx, 6xxx, and 7xxx) aluminium alloys, it has been generally reported that the heat-affected zone (HAZ) is the low hardness zone (LHZ) due to significant dissolution/coarsening of the precipitates during the FSW thermal cycle [7][8][9][10][11][12][13]. For the 2219Al-T6 alloy, although the FSW joints have been reported to have better joint efficiency compared to the fusion welded joints, the gap between the strength values of the base metal (BM) and the FSW joints is still large (N 25%) due to the softening problem of the HAZ [7][8][9].…”

“…In previous studies, several methods have been adopted to enhance the mechanical properties of FSW 2219Al-T6 joints [8][9][10][11]. Under the air-cooling (AC) condition, Chen et al [8] and Liu et al [9] reported that, at a constant rotational rate of 800 rpm, the tensile strength of FSW 2219Al-T6 joints increased when the welding speed was increased from 60 to 220 mm/min, but void defects were produced at a high welding speed of 300 mm/min.…”

“…Under the air-cooling (AC) condition, Chen et al [8] and Liu et al [9] reported that, at a constant rotational rate of 800 rpm, the tensile strength of FSW 2219Al-T6 joints increased when the welding speed was increased from 60 to 220 mm/min, but void defects were produced at a high welding speed of 300 mm/min. It is reported that water cooling is an effective methods to enhance the mechanical properties of precipitationhardened aluminium alloys [10]. Under the water-cooling (WC) condition, Zhang et al [11] reported that water cooling increased the tensile strength of FSW 2219Al-T6 joints from 324 to 341 MPa at a rotational rate of 800 rpm and a welding speed of 100 mm/min.…”

Experimental investigation on the effect of process environment on the mechanical properties of AA5083/Al 2 O 3 nanocomposite fabricated via friction stir processing

“…are all important factors which greatly impose their effects on the mechanical properties of the FSPed or FSWed sample. Also in the heat treatable alloys, depending on the process temperature, coarsening of precipitates may occur during the process, and adversely affect the strength or hardness of the metal [26,27]. Besides keeping the process temperature low, as micro-hardness test results show (Fig.…”

Effect of Post Weld Aging Treatment on Tensile Properties of Gtaw Welded Armour Grade Aa2519-T87 Aluminium Alloy Joints

“…With some magnesium alloying element it can attain high strength due to precipitation of AlCu 2 and AlCuMg phases [2]. AA2519 -T87 is newly developed high strength, heat treatable aluminium alloy with good ballistic performance, stress corrosion resistance, high strength to weight ratio and high toughness that is best suited for military applications such as parts of light combat vehicle, heavy military bridge, thus finds substitute for steel [3][4]. It is impossible to develop every component as single cast, so welding plays important role in fabrication of any structures.…”