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최영배,강문진,김동철,황인성,Choi, Young-Bae,Kang, Mun-Jin,Kim, Dong-Cheol,Hwang, In-Sung 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.1
Aluminum alloy, Al5083-O, is one of candidate materials for the LNG storage tank, because of its excellent weldability, cryogenic characteristics, and corrosion resistance. The good weldability of Al5083-O is very important in LNG storage tank manufacturing. In this study, high current metal inert gas(MIG) welding process was used to get one pass welding of thick plate aluminum alloy. Bead on plate(BOP) welding was performed to evaluate the effect of welding conditions on the height of bead and depth of penetration. The optimum welding conditions were derived to get one pass welding of the thickness of 14.5mm. The mechanical properties of the welded joint were evaluated. The cross-sectional macro test, tensile test, and bending test satisfied the class rule.
듀얼 반응표면법을 이용한 V-그루브 GMA 용접공정 최적화에 관한 연구
박형진,안승호,강문진,이세헌,Park, Hyoung-Jin,Ahn, Seung-Ho,Kang, Mun-Jin,Rhee, Se-Hun 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.2
In general, the quality of a welding process tends to vary with depending on the work environment or external disturbances. Hence, in order to achieve the desirable quality of welding, we should have the optimal welding condition that is not significantly affected by these changes in the environment or external disturbances. In this study, we used a dual response surface method in consideration of both the mean output variables and the standard deviation in order to optimize the V-groove arc welding process. The input variables for GMA welding process with the dual response surface are welding voltage, welding current and welding speed. The output variables are the welding quality function using the shape factor of bead geometry. First, we performed welding experiment on the interested area according to the central composite design. From the results obtained, we derived the regression model on the mean and standard deviation between the input and output variables of the welding process and then obtained the dual response surface. Finally, using the grid search method, we obtained the input variables that minimize the object function which led to the optimal V-groove arc welding process.
극박 다이아프램의 펄스 GTAW 공정 최적화에 관한 연구
박형진,황인성,강문진,이세헌,Park, Hyoung-Jin,Hwang, In-Sung,Kang, Mun-Jin,Rhee, Se-Hun 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.1
This paper has aimed to prevent excessive heat input by controlling arc distribution and heat input capacity with pulse GTAW in order to improve weld quality in 0.08mm pressure gauge diaphragm and flange welding parts. A design of experiment was designed using Box-Behnken method to optimize a welding process. The pulse GTAW parameters such as pulse current, base current, pulse duty, frequency and welding speed were set to input variables while hydraulic pressure that represents welding characteristics in diaphragm and flange joint were set to output variables. Based on the test result, a second regression equation was obtained between input and output variables and turned out significant. Besides, an influence of parameters has been confirmed through response surface analysis using the second-order regression equation and optimum welding condition was obtained through a grid-search method. The optimum welding condition was set to pulse current 84.4(A), base current 29.6(A), pulse duty 58.8(%), frequency 10(%), and welding speed 596(mm/min). Then, decent bead shape was acquired with no excessive heat input under the $2.3kgf/cm^2$ of hydrostatic pressure.
Ar/He 보호가스분위기에서 Al 5083 합금의 대전류 MIG 용접특성
최영배,황인성,강문진,김동철,Choi, Young-Bae,Hwang, In-Sung,Kang, Mun-Jin,Kim, Dong-Cheol 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.1
Recently, use of thick Al 5083 plate has increased in production of LNG storage tank. In general, multi-pass welding has been used to achieve sufficient penetration in thick plate welding. High current welding which enables high deposition and deep penetration is preferred in thick plate welding because the increase of number of pass increases manufacturing cost and formation of weld defect. In this study, welding characteristics according to various Ar/He shielding gas composition was investigated in high current MIG welding. The bead-on-plate welding and V groove welding were conducted on Al 5083 alloy with a thickness of .25 mm. The effect of shielding gas composition on bead shape was evaluated and proper shielding gas composition was proposed. Also arc stability was examined under selected shielding gas composition. One side-one pass welding experiments were conducted for V groove specimen with a thickness of 25 mm. Mechanical properties and hardness profiles were measured for the V groove specimens.
자동차 차체용 1.2GPa급 TRIP 강의 Weld-bond부 너깃경에 따른 인장전단특성에 관한 연구
최일동,박지연,김재원,강문진,김동철,김준기,박영도,Choi, Ildong,Park, Jiyoun,Kim, Jae-Won,Kang, Mun-Jin,Kim, Dong-Cheol,Kim, Jun-Ki,Park, Yeong-Do 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.2
High strength steels have been continually being developed to improve in fuel economy in automotive and ensure safety of passengers. New bonding and welding methods have been required for improving weldability on high strength steels. In this study, resistance spot welding and Weld-bond with nugget diameters of 4.0mm, 5.0mm, 6.0mm and 7.0mm were produced and tested, respectively. In order to confirm the effect of nugget diameters on tensile shear characteristic of the Weld-bond, tensile shear characteristics of Weld-bond were compared with those of resistance spot welding and adhesive bonding. Peak load of Weld-bond were increased as the nugget diameter increases. After appearing maximum peak load continuous fracture followed with second peak owing to load being carried by resistance spot weldment. Fracture modes of the adhesive layer in Weld-bond fractures were represented by mixed fracture mode, which are cohesive failure on adhesive part and button failure at resistance spot welds. The results showed that the tensile shear properties can be improved by applying Weld-bond on TRIP steel, and more apparent with nugget diameter higher than 5${\surd}$t.
차체용 1.2GPa급 초고장력 TRIP강의 Weldbond 접합부의 기계적 거동
이종대,이소정,방정환,김동철,강문진,김목순,김준기,Lee, Jong-Dae,Lee, So-Jeong,Bang, Jung-Hwan,Kim, Dong-Cheol,Kang, Mun-Jin,Kim, Mok-Soon,Kim, Jun-Ki 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.5
The effect of weldbond hybrid joining process on the mechanical behavior of single lap and L-tensile joints was investigated for the newly developed 1.2GPa grade ultra high strength TRIP(transformation induced plasticity) steel. In the case of single lap shear behavior, the weldbond joint of 1.2GPa TRIP steel showed lower maximum tensile load and elongation than that of the adhesive bonding only. It was considered to be due to the reduction of real adhesion area, which was caused by the degradation of adhesive near the spot weld, and the brittle fracture behavior of the spot weld joint. In the case of L-tensile behavior, however, the maximum tensile load of the weldbond joint of 1.2GPa TRIP steel was dramatically increased and the fracture mode was change to the base metal fracture which is desirable for the spot weld joint. These synergic effect of the weldbond hybrid joining process in 1.2GPa TRIP steel was considered to be due to the stress dissipation around the spot weld joint by the presence of adhesive which resulted in the change of crack propagation path.
6 wt.% 마그네슘 알루미늄 합금의 가스메탈아크 용접 특성 평가
강태훈(Tae Hoon Kang),김광국(Gwang-Gook Kim),김동윤(Dong Yoon Kim),김영민(Young-Min Kim),강문진(Mun Jin Kang) 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.5
알루미늄 합금은 항공기, 차량, 건축 등 다양한 분야에서 폭 넓게 활용되고 있다. 경량소재인 알루미늄 합금은 첨가되는 원소에 따라 다양한 특성을 가지며 그 중 마그네슘의 함량이 높아질수록 인장강도가 높아지는 경향을 보인다. 기존에 상용화된 알루미늄 합금 판재의 마그네슘 최대 함량은 약 5.2 wt.% 수준이다. 본 연구에서는 약 6.2 wt.% 마그네슘이 함유된 알루미늄 합금 판재를 이용한 용접부 인장강도 및 단면 분석을 통해 용접부 특성을 평가하였다. 용접부 형상은 Butt joint 및 Lap-fillet joint로 수행하였다. 필러와이어는 Al5356, 직경은 1.2 mm를 사용하였고, 용접모드는 DC pulse를 사용하였다. 용접 속도는 Butt joint에서 80 cm/min, Lap fillet joint에서는 60 cm/min이었고, 차폐가스는 100% Ar, 유량은 15 L/min으로 고정하였다. 적정 용접 구간을 찾아 실험을 수행하였고, 각 조건 별 용접부 특성을 평가하였다.