• Proceedings of the Korean Society of Precision Engineering Conference
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• 2007.06a
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• pp.287-288
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• 2007

• Journal of Welding and Joining
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• v.29 no.1
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• pp.59-64
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• 2011

Al6082-T6 is widely used because of its corrosion resistance and excellent strength. HAZ softening occurs in MIG welding process for this aluminium alloys because this aluminium alloy is heated to higher temperature than its aging temperature during welding. Therefore, low heat input and minimum standard deviation of heat input are required for narrow HAZ width and, for higher strength of welds. In this study, Al6082-T6 was used to examine for HAZ softening with various heat input in aluminium MIG welding. For weldments, micro hardness was measured and tensile test was carried out. Minimum hardness was increased at high speed welding such as 80cm/min and 120cm/min in welding speed comparing with 40cm/min. Also, in case of high speed welding such as 80cm/min and 120cm/min, tensile strength of weldments was increased about 10% comparing with low speed welding(40cm/min).

• Proceedings of the KWS Conference
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• 2009.11a
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• pp.8-8
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• 2009

알루미늄 합금 Al 6082-T6는 최근에 개발되어 북유럽 등의 선진국에서는 그 뛰어난 해양 내식성과 우수한 강도로 인하여 해양구조물의 헬리데크(Helideck), 타워 갱웨이(Tower gangway), 알루미늄 피팅류(Aluminium fitting)등의 해양구조물과 플랫폼(Flatform), 알루미늄 래더(Aluminium ladder)등의 선박부품, 차량, 기계부품 분야에서 전 세계적으로 널리 사용되기 시작하였다. 그러나 전통적으로 용접금속의 기공은 결함으로 분류 되고, Rakesh Kumar 등의 논문에 따르면 용접 시 용접금속 내에 발생되어진 미세기공이 기계적 성질에 악영향을 미치는 것으로 보고되어졌다. 따라서 용접금속내의 발생하는 기공을 방지하는 용접공정의 개발이 반드시 필요하다. 본 연구의 목적은 Al 6082-T6 고속 MIG용접에서 기공방지를 위한 용접공정을 개발하는 것이다. Al 6082-T6의 7t 플레이트에 Al 5356의 와이어를 사용하여 아크길이 변경 및 용접속도를 60cpm과 120cpm으로 변경하여 실험하였고, 용접속도 120cpm의 고속 MIG용접에서 토치 진행각을 변경하여 실험을 진행하였다. 용접공정 파라메터 변경에 따른 기공율 측정은 이미지 분석 소프트웨어를 사용하여 정량적으로 분석하였다.

• Journal of Surface Science and Engineering
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• v.55 no.1
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• pp.9-17
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• 2022

This work is concerned with the formation behavior of PEO (Plasma Electrolytic Oxidation) films on Al6082 alloy under the application of direct current (DC) and alternating current (AC) in an alkaline solution. Arc initiation voltage became much lower by the application of AC than DC, and arc initiation time became shorter under DC than AC. The number of pores present in the PEO films was much larger than that on the surface, irrespective of DC and AC. It was also found that the number of pores in the PEO films formed under AC was more than that under DC and the size of pores is smaller under AC than DC. During the formation of PEO films, a lot of heat was generated and solution temperature increased more rapidly under DC than under AC which is attributed to high PEO film formation voltage under DC than AC.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2006.05a
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• pp.247-250
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• 2006

The growing demand for more fuel-efficient vehicles to reduce energy consumption and air pollution is a challenge for the automotive industry. The characteristic properties of aluminum, high strengrth stiffness to weight ratio, good formability, good corrosion resistence, and recycling potential make it the ideal candidate to replace heavier materials in the car to respond to the weight resuction demand within the automotive industry. In this paper, A series of compression test was carried out to find the flow stress of A6082 at 300, 400 and $500^{\circ}C$, then we tried to estimate weldability, extrusion load and effective stress of die in the aluminum extrusion process through the 3D FE simulation at non-steady state for aluminum automotive parts.

• Transactions of Materials Processing
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• v.30 no.3
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• pp.142-148
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• 2021

In hot forging analysis, the interfacial heat transfer coefficient (IHTC) is a very important factor defining the heat flow between the die and the material. In particular, in the hot forging analysis of aluminum 6xxx series alloy, which are used in automobile parts, differences in load and microstructure occur due to changes in surface temperature according to the IHTC. This IHTC is not a constant value but changes depends on pressure. This study derived the IHTC under low load using aluminum 6082 alloy. An experiment was performed by fabricating a compression die, and a heat transfer analysis was performed based on the experimental data. The heat transfer analysis used DEFORM-2D, a commercial finite element analysis program. To derive the IHTC, heat transfer analysis was performed for the IHTC in the range of 10 to 50 kW/m²℃ at intervals of 10kW/m²℃. The heat transfer analysis results according to the IHTC and the actual experimental values were compared to derive the IHTC of the aluminum 6082 alloy under low load.

• Journal of the Korean Society of Marine Environment & Safety
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• v.20 no.4
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• pp.451-460
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• 2014

In this paper, we examined the problem of the structural stability according to the patch load of a rectangular plate that reflects the material properties of A6082-T6 is used primarily for marine plant structure. it applied to the four patch loading shapes, the effect of aspect ratio, a boundary condition and calculated the critical elastic buckling load. Calculating the critical elastic buckling load, During the eigenvalue buckling analysis it is applied to the shell181 as 4 node shell element. when the plate subjected to patch loading compare to the plate under a uniform axial compression load, it is possible observed to occur the different elastic buckling behaviour and it could be confirmed that it is affected significantly on a variable position and type of loadings, such as the effect of the aspect ratio. Also, Critical elastic buckling load according to th patch loading type in simply supported rectangular plate a/b=1.0, ${\gamma}b$=200mm are calculated 67%(Loading type I), 119 %(Loading type II), 76 %(Loading type III), 160 %(Loading type IV), respectively. Loading type I and III could be determined with the strong elastic buckling behavior much more than Loading type II and IV.

• Korean Journal of Food Science and Technology
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• v.25 no.4
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• pp.366-372
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• 1993

This study mainly designed to high quality of mirin production by using protopast fusion. In order to enhance the acid carboxypeptidase (ACPase) activity by the method of protoplast fusion. In order to enhance the acid carboxypeptidase (ACPase) activity by the method of protopalst fusion, the mutants, Aspergillus oryzae 9-12 and Aspergillus shirosamii IFO 6082-60 were selected by mutation among various mutants. Protoplast of Aspergillus oryzae 9-12 and Aspergillus shirousamii IFO 6082-60 were formed effectively by incubation of the mixtures of chitinase (10mg/ml), cellulase (10mg/ml) and zymolase 20T (5mg/ml). For protopalst fusion, the mixture of two mutant were fused to effective under the optimum conditions by solutions containing 30% PEG 6,000, 0.01M $CaCl_2\;2H_2O$, 0.6M KCl and 0.05M glycine. Fusion frequency was 0.71% and fusant, F-50 appeared ACPase activity of 20,800 unit/g which has 1.5 times higher than that of each mutants.

• Journal of the Korean Society of Marine Environment & Safety
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• v.26 no.6
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• pp.698-705
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• 2020

In this study, an improved aluminum alloy (6082-T6) was used to develop a unique model of an aluminum ladder for usage in offshore plant. The structural strength design was carried out in accordance with international standards such as ISO, NORSOK Austria Standard. Load combination was performed to satisfy all conditions. The structural safety of the designed model was verified using SACS, an analysis program for offshore plants based on the Finite elements method. The analysis results confirmed that both stress and deflection were satisfied within the acceptance criteria. The developed model can be applied used in various fields in the near future as it meets all the necessary criteria and is lightweight and has improved productivity.

• Journal of Ocean Engineering and Technology
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• v.29 no.1
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• pp.85-93
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• 2015

In this study, tensile tests were performed on aluminum alloys (AA6061 and AA6082) to investigate their mechanical behaviors at cryogenic temperatures. The temperature was varied from 110 K up to 293 K, and quasi-static strain rates of 10⁻⁴ s⁻¹ −10⁻² s⁻¹ were taken into account for the tests. The experimental results were analyzed to find the dependence on the temperature, strain rate, and fractured surfaces. As a result, it was found that the strength and elongation of the aluminum alloys were improved when the temperature was decreased. In addition, it was confirmed that the mechanical behaviors of the aluminum alloys were not dependant on the strain rate. Under a tensile load, two types of fractures were seen in the aluminum alloys: cup-cone (AA6061) and shear (AA6082).