| Author | Search for: Nadeau, François1; Search for: Mirakhorli, Fatemeh1 |
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| Affiliation | - National Research Council of Canada. Automotive and Surface Transportation
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| Format | Text, Article |
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| Conference | AERO 2019, May 14-16, 2019, Laval, QC, Canada |
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| Abstract | Laser welding technology on aluminum alloy 7075 is used increasingly in the automotive industry and aerospace applications. However, the use of this method still needs to improve due to the loss of mechanical properties or to the presence of defects, especially regarding hot cracking. The AA7075 have a significant tendency to crack formation because of their large solidification temperature range and shrinkage, which it is sensitive to thermal influences. The present work is concerned with the influence of the welding parameters and filler wire composition as a function of microcracks on the crack formation during laser welding, as well as observing of hot cracking and its propagation path to obtain a weld joint free of cracks. Non-destructive testing (NOT) technique with X-ray test has been applied for detecting cracks in the different welds of CPT samples. An optical microscope was used to characterize and investigate the microstructure. Microhardness test has been conducted for the same specimens to characterize the mechanical properties. Moreover, the local deformation in the fusion zone and its surrounding was investigated using the micro-flat tensile test with digital image correlation (DIC). The microstructure observation indicated that solidification cracking was formed at the grain boundary due to a proper amount of low melting point eutectic liquid phases during solidification after the laser welding. |
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| Publication date | 2019 |
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| Publisher | Canadian Aeronotics and Space Institute |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | NRC-AST-55 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 6caec32f-8aae-490e-9129-81933d94f0e5 |
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| Record created | 2019-07-04 |
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| Record modified | 2020-03-16 |
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