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리플로우 시간에 따른 Sn-4Ag 솔더접합부 FEM 전단해석
유효선(Hyosun Yu),양성모(Sungmo Yang),손인덕(Indeok Son),최승준(Seungjun Choi) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
The evaluation on reliability of environment-friendly Pb-free solder and solder joints is very important. The correlation between interface reaction and mechanical properties of solder joints was confirmed in this study. And shear test are performed using SP(Share-Punch) tester. The shear strength tests on various reflow time are performed at 10,30,00 and 300sec. Tested specimens were examined in order to observe the failure mode on solder joints. The test result about solder joints of two different plate(Ni and Cu plate) are compared. Ni plate joints shown low IMC growth rate. The shear strength of Pb-free solder joints are higher than Sn-37 Pb solder joints, generally. In the case of Cu plate, shear strength of Sn-4Ag solder joints increased with reflow time. And solder joints with Cu contents are seems to similar in strength regardless of reflow time. on the other hand, in the case of Ni plate joints, shear strength of Sn-37Pb solder joints are similar to Sn-4Ag solder joints. Like Cu plate joints, solder joints with Cu contents are seems to similar in strength regardless of reflow time.
양성모(Sungmo Yang),강희용(HeeYong Kang),정병호(Byeongho Jeong),유효선(Hyosun Yu),손인덕(Indeok Son),최승준(Seungjun Choi) 한국자동차공학회 2016 한국 자동차공학회논문집 Vol.24 No.4
The usage of Friction Stir Welding(FSW) technology has been increasing in order to reduce the weight in automobile industries. Previous studies that investigated on the FSW have focused on the aluminum alloy. In this study, Al6061-T6 alloy plates having 5 mm of thickness were welded under nine different conditions from three tool rotation speeds: 900, 1000 and 1100 rpm, and three feed rates: 270, 300 and 330 mm/min. Specimen size of Micro Shear Punch(MSP) test was 10×10×0.5 mm. The mechanical properties were evaluated by MSP test and Analysis of Variance (ANOVA). The specimens were classified by advancing side(AS), retreating side(RS), and center(C) of width of tool shoulder. The optimal welding condition of FSW based on micro strengh was obtained when the tool rotation speed was 1100 rpm and the feed rate was 300 mm/min. The maximum load measured AS, RS, and C in the weldment was measured 554.7 N, 642.9 N, and 579.2 N, respectively.