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Fabrication and Mechanical Properties of Tungsten Inert Gas Welding Ring Welded Joint of 7A05-T6/5A06-O Dissimilar Aluminum Alloy
- Source :
- Materials, Volume 11, Issue 7, Materials, Vol 11, Iss 7, p 1156 (2018)
- Publication Year :
- 2018
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2018.
-
Abstract
- In this paper, Tungsten Inert Gas Welding (TIG) and single-sided welding and double-sided forming have been used to weld the 7A05-T6/5A06-O dissimilar aluminum alloy circular welded joint of a ring-stiffened closed cylindrical sandwich shell. Microstructural characterization and mechanical properties of welded joints were investigated by use of scanning electron microscopy (SEM), backscatter electron diffraction (EBSD) and transmission electron microscopy (TEM), respectively. Hardness distribution and tensile properties of the welded joints were examined. The results showed the failure of the welded joints produced in the fusion zone (FZ). The tensile strength and yield strength of the welded joints were, respectively, 78.87% and 97.24% of the 5A06-O base metal (BM), and the elongation reached 84.29% of 7A05-T6 base metal. Welding high heat input led to the coarse grain size in the fusion zone, and the long-term similar quenching effect can lead to the full dissolution of the strengthening zone of the fusion zone resulting in the reductions of strength and hardness. Around 7A05 heat-affected zone (HAZ), there is an obvious hardening zone and softening zone, the solid solution precipitates into the Rayleigh brilliant &eta<br />&prime<br />(MgZn2) phase, which results in natural aging strengthening, thus obtaining high hardness. &eta<br />(MgZn2) enhanced phase dissolved fully and the dislocation density decreased rapidly in the HAZ region resulted in a softening zone with a lower hardness at about (10&ndash<br />18) mm from the center of the weld center.
- Subjects :
- Heat-affected zone
Materials science
Alloy
chemistry.chemical_element
02 engineering and technology
Welding
engineering.material
Tungsten
lcsh:Technology
01 natural sciences
Article
law.invention
law
microstructural characterization
0103 physical sciences
Ultimate tensile strength
TIG welding
General Materials Science
Composite material
lcsh:Microscopy
lcsh:QC120-168.85
010302 applied physics
lcsh:QH201-278.5
lcsh:T
Gas tungsten arc welding
heat-affected zone
021001 nanoscience & nanotechnology
Aluminum alloys
heat input
chemistry
lcsh:TA1-2040
engineering
Hardening (metallurgy)
lcsh:Descriptive and experimental mechanics
similar quenching effect
lcsh:Electrical engineering. Electronics. Nuclear engineering
lcsh:Engineering (General). Civil engineering (General)
0210 nano-technology
lcsh:TK1-9971
Electron backscatter diffraction
Subjects
Details
- Language :
- English
- ISSN :
- 19961944
- Database :
- OpenAIRE
- Journal :
- Materials
- Accession number :
- edsair.doi.dedup.....c63d0e708a40f29c0df354c8cdc865db
- Full Text :
- https://doi.org/10.3390/ma11071156