Pulsed gas metal arc welding of Al–Cu–Li alloy

Padmanabham, G.; Pandey, Sunil; Schaper, M.

doi:10.1179/174329305x19358

Cited by 22 publications

(16 citation statements)

References 14 publications

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“…Arc welding is often sensitive to the formation of coarse grains in the heat-affected zone (HAZ), which deteriorates the mechanical properties of the joints. Furthermore, as an alternative to weld aluminum alloy, FSW overcomes the problem of hot cracks; however, it also results in some problems by the softening of the welding nugget zone, thermal mechanical affected zone, and low welding speed [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of laser-MIG hybrid welding of 1420 Al-Li alloy

Yan

Gao

et al. 2012

Int J Adv Manuf Technol

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This paper investigates the microstructure and mechanical properties of 1420 aluminum-lithium (Al-Li) alloy joints before and after heat treatment by CO 2 lasermetal inter gas (MIG) hybrid welding. The 5-mm-thick 1420 Al-Li alloy plates were welded by CO 2 laser-MIG hybrid welding. Full penetration joints without any defects were produced. Optic and scanning electron microscopy were used to study the microstructure and fractograph characteristics. The results show that the microstructures of the heat-affected zone (HAZ) and fusion zone exist as a predominantly discontinuous equiaxed dendritic structure and as a fine cellular dendritic structure, respectively. After heat treatment, the microstructures change from dendritic structure to a spheroidal crystal; the grain size of fusion zone is obviously larger than that of the base metal and the HAZ. Furthermore, the hardness recovers substantially to a level similar to that of the parent material. The tensile strengths of the joints in the as-welded condition and after heat treatment are 223 and 267 MPa, reaching up to 57 and 68 % of the parent materials' strength, respectively. The fractographs show that the joint as-welded condition exhibits the characteristics of dominated dimples and a small amount tear ridges, which are associated with the mixed ductile and brittle facture mechanisms. The fracture mode transforms from a transgranular to an intergranular after heat treatment; cleavage cracking coupled with an intergranular microvoid coalescence fracture mechanism occurs.

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Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of laser-MIG hybrid welding of 1420 Al-Li alloy

Yan

Gao

et al. 2012

Int J Adv Manuf Technol

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“…Arc welding of Al-Li based alloys has been comprehensively studied [4][5][6]. However, the results from these studies suggest that several issues, such as a large heat-affected zone (HAZ), large distortion, porosity, high residual stresses and poor mechanical properties are present in conventional fusion welding techniques [4][5][6]. On the other hand, laser beam welding (LBW) with its tight focusability and high power density of the laser beam can overcome those problems [7][8][9].…”

Section: Introductionmentioning

confidence: 98%

“…Among the various challenges facing the widespread use of Al-Li alloys in the aerospace sectors are the joining method selection and their impact on the mechanical properties of Al-Li weldment [3]. Arc welding of Al-Li based alloys has been comprehensively studied [4][5][6]. However, the results from these studies suggest that several issues, such as a large heat-affected zone (HAZ), large distortion, porosity, high residual stresses and poor mechanical properties are present in conventional fusion welding techniques [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of porosities on tensile properties of laser-welded Al-Li alloy: an experimental and modelling study

Liu

Lee

et al. 2017

Int J Adv Manuf Technol

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Aluminium-lithium (Al-Li) alloys are very attractive for aerospace applications due to their outstanding properties, such as high specific strength, high rigidity and good resistance to corrosion and fatigue, compared to conventional aluminium alloys. The butt joints of Al-Li 2A97-T3 alloy sheet produced by fibre laser welding with ER2319 filler wire were investigated in this paper. Uniaxial tensile tests have been performed to determine the nominal mechanical properties of the joints with and without porosities. In addition, a defect zone was defined in the welded specimens to investigate the effects of porosity on the joint tensile behaviour. The post-weld strength prediction (PWSP) model in a previous study has been extended by including the effects of the porosity in the welds to predict the overall response of the butt joints. The experimental and the modelling results show a good agreement, with the yield strength having a deviation lower than 5%. Both the yield strength and the ductility of the tensile specimens were observed to have decreased with the presence of porosities. The porosities aggravated the inhomogeneous deformation in the weld zone. Higher strain rate was found in the defect area than the remaining weld zone during plastic deformation, as the porosity in the specimen caused inhomogeneous deformation. It was found that this accelerated the failure of the specimen and lowered the global ductility significantly.

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“…To take advantage of these promising features in structural applications, methods of welding Al-Li based alloys, must be thoroughly investigated and understood to maximize the structural capabilities of this light alloys [4]. Until now studies have been made on conventional fusion welding of Al-Li based alloys using a wide variety of welding processes [5][6][7]. These studies show that conventional fusion welding processes have exhibited some disadvantages such as a large heat-affected zone (HAZ), porosity, high residual stresses and low tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nd:YAG laser welding on microstructure and hardness of an Al–Li based alloy

Cui

et al. 2012

Materials Characterization

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Pulsed gas metal arc welding of Al–Cu–Li alloy

Cited by 22 publications

References 14 publications

Microstructure and mechanical properties of laser-MIG hybrid welding of 1420 Al-Li alloy

Microstructure and mechanical properties of laser-MIG hybrid welding of 1420 Al-Li alloy

Effect of porosities on tensile properties of laser-welded Al-Li alloy: an experimental and modelling study

Effect of Nd:YAG laser welding on microstructure and hardness of an Al–Li based alloy

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