Journal ArticleDOI
Optimisation of pulse frequency in pulsed current gas tungsten arc welding of aluminium–lithium alloy sheets
TLDR
In this article, the effects of current pulsation frequency on weld bead microstructure, hardness, and tensile properties in AA8090 type aluminium-lithium alloy sheets were studied.Abstract:
Effects of current pulsation frequency on weld bead microstructure, hardness, and tensile properties in AA8090 type aluminium-lithium alloy sheets were studied. It was observed that the structure in the as solidified weld was predominantly columnar in the case of the conventional (i.e. continuous current) gas tungsten arc welding process. The grain structure became finer and more equiaxed with the introduction of current pulsation. Moreover, there was an optimum frequency range over which the grain refinement was a maximum. The same optimum frequency range corresponded with maxima in hardness, ultimate tensile strength, and percentage elongation. Tensile strength increased, in general, after solution treatment and aging (STA). The best combination of tensile properties was achieved for welds deposited under a 6 Hz pulse frequency in the STA condition.read more
Citations
More filters
Journal ArticleDOI
Effect of welding processes on tensile properties of AA6061 aluminium alloy joints
TL;DR: In this article, the effect of welding processes such as GTAW, GMAW, and FSW on mechanical properties of AA6061 aluminium alloy was investigated, and it was found that FSW joints of AA 6061 aluminum alloy showed superior mechanical properties compared with GTAW and GMAw joints, and this was mainly due to the formation of very fine, equiaxed microstructure in the weld zone.
Journal ArticleDOI
Influences of pulsed current tungsten inert gas welding parameters on the tensile properties of AA 6061 aluminium alloy
TL;DR: In this article, the influence of pulsed current TIG welding parameters on tensile properties of AA 6061 aluminium alloy weldments was investigated. And the results showed that pulsed currents can improve the mechanical properties of the welds compared to those of continuous current welds.
Journal ArticleDOI
Optimization of pulsed TIG welding process parameters on mechanical properties of AA 5456 Aluminum alloy weldments
Adepu Kumar,S. Sundarrajan +1 more
TL;DR: In this paper, the improvement of mechanical properties of AA 5456 aluminum alloy welds through pulsed tungsten inert gas (TIG) welding process was investigated and regression models were developed to check the adequacy of the developed models.
Journal ArticleDOI
Microstructural refinement of weld fusion zones in α-β titanium alloys using pulsed current welding
TL;DR: In this paper, gas tungsten-arc welds were produced in two α-β titanium alloys under a variety of conditions including direct current (d.c.) pulsing and alternating current (a.c.).
Journal ArticleDOI
Effect of pulsed current welding on mechanical properties of high strength aluminum alloy
TL;DR: In this article, an attempt has been made to refine the fusion zone grains by applying a pulsed current welding technique, which leads to relatively finer and more equi-axed grain structure in GTA and GMA welds.
References
More filters
Journal ArticleDOI
Weld microstructure refinement in a 1441 grade aluminium-lithium alloy
TL;DR: In this paper, the weld beads obtained under (i) continuous current (CC), (ii) pulsed current (PC), and (iii) arc oscillation (AO) conditions for their macro- and microstructural details were compared.
Journal ArticleDOI
The weldability of lithium-containing aluminium alloys
Abstract: Lithium-containing aluminium alloys have reduced density and increased elastic modulus compared with conventional aluminium alloys. Many such alloys are currently under development for aircraft applications, which usually involve mechanical fastening. Consequently, the weldability of lithium-containing aluminium alloys is currently receiving relatively little attention. The weldability of lithium-containing aluminium alloys is reviewed. The vast majority of the welding studies performed have been on the Soviet Al-5 wt% Mg-2 wt% Li alloy, 01420. Alloy 01420 and other lithium-containing aluminium alloys are indeed fusion weldable, and weldments having high joint efficiencies have been made.