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나의균(Euigyun Na),오석형(Seokhyung Osh),김장권(Jangkweon Kim) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.5-1
The purpose of this study is to examine the characteristics and weldability of the spot weld region for the car body. Steel used was ss41 with cold work and 0.8mm, 1.0mm, 1.2mm and 1.6mm of thickness. Finite element method(FEM) and tensile-shearing test were conducted to investigate the characteristics of the spot weld region. Tensile-shearing test was done to obtain the weldability of the spot weld region. Real current values were measured using the Sigmatron apparatus in the course of welding process. Nugget sizes which were obtained from FEM analysis and experimental results were almost the same. Besides, nugget sizes increased with the current values for the each thickness. However, maximum loads for the specimens were dependent upon the current values. Except for 0.8mm thickness, maximum load increased with the current values almost. Welding time was important parameter also
나의균(Euigyun Na),오석형(SeokhyungOsh),김장권(Jangkweon Kim),김연직(YoenjigKim) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.5-2
The purpose of this study is to examine the characteristics of the spot weld region for the car body. Steel used was ss41 with cold work and 0.8mm of thickness. Spot weld was conducted in air. Finite element method(FEM) and experiment were conducted to investigate the characteristics of the spot weld region. Basic data against the steel were composed of the relations of the specific heat, conductivity, and temperature. Software used was SYS-weld. Node and mesh was made. Tension - shearing test was conducted against the spot weld specimens. Sputtering phenomena occurred at the initial spot weld stage which causes the inappropriate and poor weld for the car body. Residual stresses were produced around the spot weld region and maximum value was located 4mm away from the weld center. It was verified that maximum load around the spot weld region was dependent upon the weld current through the tension-shearing test.