• 제목/요약/키워드: 5083-Al alloy

검색결과 104건 처리시간 0.023초

해수 환경에서 Al5083-H321 알루미늄 합금의 침식부식 손상에 미치는 유속의 영향과 손상 메카니즘 (Effect of Flow Rate on Erosion Corrosion Damage and Damage Mechanism of Al5083-H321 Aluminum Alloy in Seawater Environment)

  • 김영복;김성종
    • Corrosion Science and Technology
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    • 제19권3호
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    • pp.115-121
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    • 2020

  • In this study, erosion tests and erosion-corrosion tests of Al5083-H321 aluminum alloy were conducted at various flow rates in seawater. The erosion tests were conducted at a flow rate of 0 to 20 m/s, and erosion-corrosion tests were performed by potentiodynamic polarization method at the same flow rate. Characteristic evaluation after the erosion test was conducted by surface analysis. Characteristic evaluation after the erosion-corrosion test was performed by Tafel extrapolation and surface analysis. The results of the surface analysis after the erosion test showed that surface damage tended to increase as the flow rate increased. In particular, intermetallic particles were separated due to the breakdown of the oxide film at 10 m/s or more. In the erosion-corrosion test, the corrosion current density increased as the flow rate increased. Additionally, the surface analysis showed that surface damage occurred in a vortex shape and the width of the surface damage tended to increase as the flow rate increased. Moreover, damage at 0 m/s, proceeded in a depth direction due to the growth of pitting corrosion, and the damaged area tended to increase due to acceleration of the intermetallic particle loss by the fluid impact.

  • https://doi.org/10.14773/cst.2020.19.3.115 인용 PDF KSCI

대전류 및 용가재 직경에 따른 Al5083 아크 용접부 마그네슘 기화 및 기계적 성질 (Effects of High Current and Welding Wire Diameter on the Magnesium Vaporization and Mechanical Properties of Al5083 Arc Welds)

  • 권혜미;박철호;홍인표;강남현
    • Journal of Welding and Joining
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    • 제31권6호
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    • pp.84-89
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    • 2013

  • The demand of LNG tank and the constituting material, i.e., the Al5083 thick plate, increased due to the rapid growth LNG market. To weld the Al5083 thick plate, the gas metal arc welding (GMAW) of high current is necessary to increase manufacturing productivity incurred by the multi pass welding. However, the arc welding vaporizes the volatile element such as magnesium (Mg). This phenomenon changes the Mg composition of the weld metal and the mechanical properties. The study investigated the weldability of Al5083 alloys after conducting high current GMAW. The Al5083 alloy was welded by using different size of welding wires and high current (800-950A). As the arc current increased from 800A to 950A, the mechanical strength decreased and the secondary dendrite arm spacing (SDAS) increased. Even though the arc current increased SDAS, the mechanical strength decreased due to the Mg loss in the weldment. The large diameter of welding wire decreased the dilution of the weld, therefore increasing the Mg content and the strength of the weld. For the reason, the content of Mg in welds was a major parameter to determine the mechanical property for the high current GMAW. For the arc current between 800A and 950A, the yield strength of the weldments showed a relationship with the weight percent of Mg content ($X_{Mg}$): Y.S = 27.9($X_{Mg}$)-11.

  • https://doi.org/10.5781/KWJS.2013.31.6.84 인용 PDF KSCI

[논문 철회] 친환경 레져선박에 적용되는 Al 5083 합금의 인장특성 및 열응력에 미치는 용접조건의 영향 ([Retracted] The Effect of Welding Conditions on Tensile Characteristics and Thermal Stress of Al 5083 Alloy Applied to Co-environmental Leisure Ships)

  • 문병영;이기열;김규선
    • 대한조선학회논문집
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    • 제51권6호
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    • pp.548-555
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    • 2014

  • As a considerable, experimental approach, an Auto-carriage type of $CO_2$ welding machine and a MIG(Metal Inert Gas) welding robot under inert gas atmosphere were utilized in order to realize Al 5083 welding applied to hull and relevant components of green Al leisure ships. This study aims at investigating the effect of welding conditions(current, voltage, welding speed, etc) on thermal deformation that occurs as welding operation and tensile characteristics after welding, by using Al 5083, non-ferrous material, applied to manufacturing of co-environmental Al leisure ships. With respect to welding condition to minimize the thermal deformation, 150A and 16V at the wire-feed rate of 6mm/sec were acquired in the process of welding Al 5083 through an auto carriage type of $CO_2$ welding feeder. As to tensile characteristics of Al 5083 welding through a MIG welding robot, most of tensile specimens showed the fracture behavior on HAZ(Heat Affected Zone) located at the area joined with weld metal, except for some cases. Especially, for the case of the Al specimen with 5mm thickness, 284.62MPa of tensile strength and 11.41% of elongation were obtained as an actual allowable tensile stress-strain value. Mostly, after acquiring the optimum welding condition, the relevant welding data and technical requirements might be provided for actual welding operation site and welding procedure specification(WPS).

  • https://doi.org/10.3744/SNAK.2014.51.6.548 인용 PDF KSCI KPUBS