Microstructural and mechanical characterization of laser-beam welding of a 8090 Al-Li thin sheet

Lee, M. F.; Huang, J.C.; Ho, New-Jin

doi:10.1007/bf00357853

Cited by 42 publications

(14 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[29] Al-base materials (except under vacuum), the wide applicaAdding solute elements or ceramic reinforcements would tion of HSRS composites via superplastic forming/diffusion reduce the surface reflection of the laser beam. [30] Figure 12 or fusion bonding combinations might be subject to shows the variation of overall FZ ϩ PL-HAZ cross-sectional limitations. areas as a function of heat input for different SiC volume fractions.…”

Section: B Welding Feasibilitymentioning

confidence: 99%

Electron and laser beam welding of high strain rate superplastic Al-6061/SiC composites

Huang

Chen³

2001

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

The welding characteristics of a fine-grained 6061 Al and three 6061/1, 5, and 20 pct SiC composites under high energy electron beam welding (EBW) and laser beam welding (LBW) were examined. The three composites exhibited high strain rate superplasticity (HSRS). The 6061 Al was more readily welded by EBW than by LBW, and the situation was reversed in the reinforced composites. In the reinforced composites, the fusion zone contained the once fully melted matrix and fully reacted SiC, and the heat affected zone (HAZ) contained the partially melted matrix and nearly unreacted SiC. This effect was particularly apparent in the 20 pct SiC composite. With increasing SiC content from 0 to 20 pct, the reflection of the laser beam decreased, and the melt viscosity increased due to the increasing amount of Al 4 C 3 compounds. For the HSRS fine-grained 6061/20 pct SiC composite, there formed a sharp V-notch under EBW. The high viscosity or low fluidity of the melt inside the fusion zone of 6061/20 pct SiC resulted in incomplete backfill and notch formation. The postweld mechanical performance and joint efficiency both became seriously degraded. The original fine structures in the HSRS composites could not be restored after welding.

show abstract

Section: B Welding Feasibilitymentioning

confidence: 99%

Electron and laser beam welding of high strain rate superplastic Al-6061/SiC composites

Huang

Chen³

2001

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

show abstract

“…In particular, there is an advantage in applying LB welding to age-hardened aluminum alloys since its low overall heat input minimizes the size of the weld fusion zone (FZ) and HAZ. Although many studies have been carried out to modify the conditions of LB welding process and post-weld heat treatment, most of them have been limited to certain aluminum alloys including Al-Li-Cu alloy, Al-Mg-Mn alloy, AlMg-Si-Cu alloy and Al-Mg-Si alloy [8][9][10][11][12][13]. There have been few extensive investigations of the mechanical properties and the fracture behavior of welds in Al-ZnMg-Cu 7075 alloy.…”

Section: Introductionmentioning

confidence: 98%

Tensile fracture behavior in CO2 laser beam welds of 7075-T6 aluminum alloy

2004

View full text Add to dashboard Cite

“…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

View full text Add to dashboard Cite

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.

show abstract

Microstructural and mechanical characterization of laser-beam welding of a 8090 Al-Li thin sheet

Cited by 42 publications

References 10 publications

Electron and laser beam welding of high strain rate superplastic Al-6061/SiC composites

Electron and laser beam welding of high strain rate superplastic Al-6061/SiC composites

Tensile fracture behavior in CO2 laser beam welds of 7075-T6 aluminum alloy

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

Contact Info

Product

Resources

About