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Al6061-T6의 마찰교반용접 시 회전 Tool Pin 형상에 따른 기계적 특성 평가
임병철(ByungChul Lim),김대환(DaeHwan Kim),박상흡(SangHeup Park) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.4
In this study, an age-hardened 6061-T6 alloy sheet was used, which is commonly utilized for auto parts. The junction strength characteristics in relation to the stirring speed and welding speed were studied in accordance with the friction stir welding rotation of the tool pin. Micro hardness measurements of A type and B type pins, for a welding speed of 400 mm/min and a tool rotational speed 3000 rpm, were obtained as Hv104 and Hv111, respectively. For a welding speed of 200 mm/min and a tool rotational speed of 2000 rpm, we obtained Hv48 and Hv50 for A and B type pins, respectively. Microstructure observation showed that the stirring portion was fine and uniform, which occurred because of its plastic deformation. In the thermomechanically affected zone, partial recrystallization was present because of the plastic deformation. The crystal grains in the heat affected zone were coarsened due to the heat generated by friction stir welding.
FCAW를 이용한 SM45C의 혼합가스비율에 따른 전류파형 및 용접특성 연구
이종훈(JongHun Lee),임병철(ByungChul Lim),박상흡(SangHeup Park) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.6
This study, analyzed the waveform and mechanical properties of flux cored arc Welding on SM45C. CO₂ 10% + Ar 90% shows the lowest standard deviation and shunt ratio at which the arc was most stable. CO₂ 10% + Ar 90% is equal to CO₂ 20% + Ar 80%. therefore, CO₂ 20% + Ar 80% is the best of mixture gases. The hardness test result for the gas mixture ratio of CO₂ 10% + Ar 90% was HV 249.7 which is the highest measured value. According to tensile test results, the tensile strength increased with increasing Ar in the mixture gas. This was because of the inertness of the argon, which does not combine with other elements, causing CO₂ to combine with pearlite and ferrite and decreasing the maximum tensile strength. Microstructural examination results show that with increasing Ar, ferrite generation decreases while the mild microstructure increases which influences the hardness.
SPFC 590 강재의 저항 점 용접 특성에 관한 연구
김대환(DaeHwan Kim),강태종(TaeJong Kang),신석우(SeokWoo Shin),박상흡(SangHeup Park) 한국생산제조학회 2018 한국생산제조학회지 Vol.27 No.2
Fossil fuel depletion and environmental pollution have led to the enforcement of strict regulations. In many countries, there is a need to improve fuel efficiency by more than 40% to achieve the carbon emission reduction target to be imposed in 2025. To improve fuel efficiency, the weight of automobiles is being reduced by using lightweight material such as aluminum or magnesium alloys for the body, developing molding and machining technologies, and optimizing the shape of existing parts. Body weight reduction is the most efficient way to reduce the automobile weight, thereby saving fuel by maximizing the engine efficiency. High strength steel can also be used to save weight, as it can be made thinner, and therefore lighter. Herein, the welding characteristics of SPFC590 1.2 t steel were analyzed. The quality of the resistance spot welded part was predicted by analyzing the dynamic resistance pattern.