Microstructural change of the HAZ in an MIG welded bond on an AA7020 aluminium alloy: stress corrosion crack growth rate in dissimilar metal welds

Bloem, Carlos; Salvador, M. D.; Amigó, V.; Busquets, D.

doi:10.1533/wint.2004.3287

Cited by 1 publication

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“…The transformation sequence for aging in the 7xxx series can be described as follows: [15,16] solid solution (a) fi GP(I) fi GP(II) fi g¢ fi g (MgZn 2 ). The GP(I) and GP(II) are formed at different temperature ranges, GP(I) is found after aging at room temperature, and GP(II) is formed mainly above 343 K (70°C), or occasionally after aging for a very long time (several weeks or more).…”

Section: A Effect Of Several Welding Beads On the Hardness Of The Hamentioning

confidence: 99%

Effect of the Number of Welding Repairs with GTAW on the Mechanical Behavior of AA7020 Aluminum Alloy Welded Joints

Maya-Johnson

Santa

Mejía

et al. 2015

Metall Mater Trans B

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In this work, two different tests were done to establish the effect of heating cycles by welding in an AA7020-T6 aluminum alloy welded with ER5087 and ER5356 electrodes. During 10 months, welds were done to simulate in the laboratory several welding repairs (up to six repairs). Tensile and hardness measurements were done to evaluate the evolution of the properties against time. It was found that a single pass is enough to generate a heat-affected zone (HAZ) of 30 mm, and after four repairs the width of the HAZ exceeds 210 mm. In the HAZ, two regions were observed: the dissolution zone, which recovers a percentage of hardness by natural aging, and the over-aging zone, showing no increase in hardness. The results indicate that there is a maximum number of welding repairs that can be performed in a heat-treatable aluminum superstructure before it fails on the HAZ of the base material, since the tensile strength is reduced around 40 pct compared to the base metal.

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Section: A Effect Of Several Welding Beads On the Hardness Of The Hamentioning

confidence: 99%

Effect of the Number of Welding Repairs with GTAW on the Mechanical Behavior of AA7020 Aluminum Alloy Welded Joints

Maya-Johnson

Santa

Mejía

et al. 2015

Metall Mater Trans B

View full text Add to dashboard Cite

show abstract

Microstructural change of the HAZ in an MIG welded bond on an AA7020 aluminium alloy: stress corrosion crack growth rate in dissimilar metal welds

Abstract: , MD.; Amigó, V.; Busquets Mataix, DJ. (2004). Microstructural change of the HAZ in an MIG welded bond on an AA7020 aluminium alloy: stress corrosion crack growth rate in dissimilar metal welds. Welding International. 18(7):538-542.

Cited by 1 publication

References 3 publications

Effect of the Number of Welding Repairs with GTAW on the Mechanical Behavior of AA7020 Aluminum Alloy Welded Joints

Effect of the Number of Welding Repairs with GTAW on the Mechanical Behavior of AA7020 Aluminum Alloy Welded Joints

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