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알루미늄 합금의 레이저 용접 시 중심합성계획법을 이용한 용접부 형상 연구
최동혁(Donghyeok Choi),신중한(Joonghan Shin) 대한용접·접합학회 2020 대한용접·접합학회지 Vol.38 No.5
In this study, the effect of process variables on the weld shape in laser lap welding of aluminum alloys is investigated. A welding experiment using a central composite design (CCD) and the corresponding analysis of variance (ANOVA) were conducted to statistically investigate the significance of process variables and their interaction effect on the weld shape. The results of the ANOVA and analysis of the interaction effect indicated that laser power and focal position the most significantly affected weld depth. The weld depth increased as the laser power increased and the focal position became far away from the surface (below the surface). Scan speed and focal position corresponded to critical factors for the bead width. The bead width increased as the scan speed decreased and the focal position became far away from the surface (above the surface). Furthermore, the laser power and scan speed had exhibited the most significant effect on the weld area. The weld area increased when laser power increased and scan speed decreased. Second-order regression models were developed to predict the weld shape (weld depth, bead width, and weld area). The order of fitness of the regression models was as follows: bead width (R²=0.94), weld depth (R²=0.90), and weld area (R²=0.82).
다구찌방법을 이용한 커버유리의 이산화탄소 레이저 드릴링 가공
신중한(Joonghan Shin),최동혁(Donghyeok Choi) 대한용접·접합학회 2019 대한용접·접합학회지 Vol.37 No.3
This study reports CO₂ laser drilling of the cover glass using the Taguchi method. In this study, the Taguchi method containing L16 (4 factors and 4 levels) orthogonal array design was employed to investigate the effect of process parameters on hole quality. Based on the results of experiments, holes with a high total hole quality index (THQI) show less cracking and heat affected zone (HAZ), and in this case the circular morphology of a hole is relatively well kept. From the Taguchi analysis, it is found that the THQI is significantly affected by laser power, however the effect of the focal position on the THQI is very small. The optimal process parameters to maximize the THQI are the laser power of 20 W, the scan speed of 20 mm/s, the scan of 1 pass and the focal position of 0 mm. The regression model to predict the THQI is obtained using the surface response method. It is confirmed that the regression model predicts the THQI with 5.717 % error (average).