• Title/Summary/Keyword: AL6061

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A Study on the Weldability and the Fatigue Characteristics in Resistance pot Welding of 5182-O/6061-T6 Dissimilar Aluminum Alloy Sheets (이종 AI합금의 저항점용접부 용접성과 피로특성에 관한 연구)

  • 박진철;정원욱;강성수
    • Journal of Welding and Joining
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    • v.17 no.2
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    • pp.44-52
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    • 1999

  • This study deals with spot weld ability of dissimilar aluminum alloy sheets in order to take advantage of its lightweight and strength. The paper also shows the relationship between weld elements(i.e. current, welding time and tip force) and weld quality on the resistance spot weld part of the same and dissimilar Al alloy. The conclusions are: (1) Because of excessive tip force, deep indentation remained at the Al 5182 side which is lower stiffness at the dissimilar Al alloy. (2) Weld quality (i.e. tensile shear strength) of dissimilar Al alloy is superior to that of the same Al 6061 alloy. (3) As long cycles, fatigue life of spot weld specimen on dissimilar Al alloy sheets was better than that of the same Al alloy.

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Microstructure and Mechanical Properties of AA1050/AA6061/AA1050 Layered Sheet Aging-Treated after Cold Roll-Bonding (냉간접합압연 후 시효처리된 AA1050/AA6061/AA1050 층상판재의 미세조직 및 기계적 성질)

  • Sang-Hyeon Jo;Seong-Hee Lee
    • Korean Journal of Materials Research
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    • v.33 no.12
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    • pp.565-571
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    • 2023

  • AA1050/AA6061/AA1050 layered sheet was fabricated by cold roll-bonding process and subsequently T4 and T6 aging-treated. Two commercial AA1050 sheets of 1 mm thickness and one AA6061 sheet of 2 mm thickness were stacked up so that an AA6061 sheet was located between two AA1050 sheets. After surface treatments such as degreasing and wire brushing, they were then roll-bonded to a thickness of 2 mm by cold rolling. The roll-bonded Al sheets were then processed by natural aging (T4) and artificial aging (T6) treatments. The as roll-bonded Al sheets showed a typical deformation structure, where the grains are elongated in the rolling direction. However, after the T4 and T6 aging treatments, the Al sheets had a recrystallized structure consisting of coarse grains in both the AA5052 and AA6061 regions with different grain sizes in each. In addition, the sheets showed an inhomogeneous hardness distribution in the thickness direction, with higher hardness in AA6061 than in AA1050 after the T4 and T6 age treatments. The tensile strength of the T6-treated specimen was higher than that of the T4-treated one. However, the strength-ductility balance was much better in the T4-treated specimen than the T6-treated one. The tensile properties of the Al sheets fabricated in the present study were compared with those in a previous study.

  • https://doi.org/10.3740/MRSK.2023.33.12.565 인용 PDF