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실험계획법에 의한 AZ31마그네슘합금의 마찰접합시 최적공정설계
강대민(Dae-Min Kang),곽재섭(Jae-Seob Kwak),최종환(Jong-Whan Choi),박경도(Kyeong-Do Park) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.4
Magnesium alloy has been known as lightweight material in automobile and electronic industry with aluminum alloy, titanium alloy and plastic material. Friction welding is useful to join different kinds of metals and nonferrous metals they are difficult to be joined by such as gas welding, resistance welding and electronic beam welding. In this study, friction welding was performed to investigate optimization process of Mg alloy with a 20㎜ diameter solid bar. For that, the orthogonal array (L9(34)) was used that contained four factors and each factor had three levels. Control factors were heating pressure, heating time, upsetting pressure and upsetting time. Also tensile tests were carried out to measure mechanical properties for welded conditions. The levels of heating pressure and upsetting pressure used were 15, 25, 35㎫, and 30, 50, 70㎫, respectively. In addition those of heating time and upsetting time were 0.5, 1, 1.5 sec and 3, 4, 5 sec., respectively, rotating speed of 2000rpm. From the experimental results, optimization condition was estimated as follows; heating pressure=35㎫, upsetting pressure=70㎫, heating time=1.5sec, upsetting time=3sec.