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저항점용접된 Al5052/DP590 이종소재의 특성평가 및 공정의 최적화
조범지,김지선,유효상,김인주,이성희,김영곤,Jo, Beom-Ji,Kim, Ji-Sun,Yoo, Hyo-Sang,Kim, In-Ju,Lee, Seong-Hui,Kim, Young-Gon 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.2
IRW(Inverter Resistance Welding) process and DSW(Delta-spot welding) process for dissimilar materials of DP590 and Al5052 were performed to evaluate the welding quality and mechanical properties. IRW experiment was carried out with changing the welding current. The other welding parameters such as pressure force, weld time, squeezing time and holding time were fixed. On the anther hand, DSW experiment was performed using the process tape at welding current of 11.5kA. The other conditions were same as IRW conditions. The various testes such as shear tensile strength, nugget diameters, EDS, SEM and cross-sectional observation for weld zone was performed. As a result, IMC(Inter Metallic Compound) thickness at 11.5kA was thinner than those of 9.5kA and 10.5kA conditions. In addition, thined IMC layer was observed when high electric current apply to the materials(DP590 and Al5052) in a short time throught dissimilar resistance spot welding controling welding conditions. The relationship between the thickeness of IMC and current intensity was after discussed.
김영곤,조범지,김지선,김인주 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.1
Recently, Car makers have required a light weight of vehicles in relation to fuel efficiency. In that respect, dissimilar welding method is very important in the car body assembly process. In this study, resistance spot welding was performed to evaluate the welding quality and mechanical properties for dissimilar materials of the cold rolled DP590 and Al 5052. The welding experiment was carried out changing with the welding current and the other process parameters such as electrode force, weld time, squeezing time and holding time were fixed with the basic welding condition of the ISO18278-2 standard. Especially, the shear tensile strength was evaluated at each condition and the cross-sectional observation for weld zone such as nugget diameter was performed. As a result, the thickness of IMC (Intermetallic Compound) layer at 11.5 kA was thinner than those of 9.5 kA and 10.5 kA conditions. On the other hand, Delta-spot welding experiment was performed using various process tapes at welding current of 11.5 kA. The other conditions were same with that of the conventional spot welding. Sound welds was formed by applying to the optimum welding conditions in the Delta-spot process due to the thermal balance of dissimilar materials.
정현욱(Hyeonwook Jung),민윤상(Yoonsang Min),조범지(Beomji Jo),이지호(Jeeho Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In general, most electric vehicle manufacturers make cars using monocoque bodies. This type has advantages such as low production cost, light weight and good fuel economy. However, it is not suitable for small-series car manufacturers because the design is very difficult and requires investment in large production processes. In this study, the bending stiffness and torsional stiffness of a composite material (CFRP) frame that can be applied to various small-series vehicles with one platform were measured and analyzed.