AA3003 알루미늄 합금의 마찰교반용접시 인장강도에 미치는 공정변수의 영향

Abstract

Recently, as interest in energy efficiency and environmental issues is increasing around the world, research on welding technology is becoming important. In this study, friction stir welding (FSW) was applied to AA3003 aluminum alloy to investigate the effect of process variables on mechanical properties. The material used in the experiment was 2t x 100mm x 150mm and friction stir welding was performed by the butt welding method, and the process variables were selected as rotation speed, feed speed and shoulder diameter. The friction stir welding was performed in three levels, and a total of 27 experiments were performed three times. In order to quantitatively analyze the tensile strength results, a three-way factorial design was used. Variance analysis showed the correlation of process variables with tensile strength and the optimal process variable combination. As a result of the analysis of variance, all the parameters selected in the experiment affected the weld tensile strength, and partly the interaction was detected. The effect of process variables on the tensile strength of the weld was confirmed in the order of shoulder diameter, rotational speed, and feed speed of the tool. In addition, internal defects were found to have a large influence on the feed rate. As a result of the main effect and interaction analysis, it was estimated that the highest tensile strength was obtained when the shoulder diameter level was 2, the rotation speed level was 1, and the feed speed level was 2. Finally, the SZ hardness of the optimum level combination through main effects and interactions was 75Hv. And the SZ hardness of the maximum tensile strength combination was found to be 60Hv.