Al6082-T6의 MIG용접에서 입열량에 따른 열영향부 연화와 인장특성에 관한 연구

Abstract

Al6082-T6 is widely used because of its corrosion resistance and excellent strength. HAZ softening is occurred in MIG welding process for aluminium alloys because it was heated to higher temperature than its aging temperature during welding. Therefore low heat input and minimum standard deviation of heat input is required for narrow HAZ width and, for higher strength of welds. But, there are not enough study for these relations. In this study, Al6082-T6 was used to examination for HAZ softening with various heat input in aluminium MIG welding. For weldments, micro hardness was measured and tensile test was carried out. Consequently, we could assess the HAZ softening and tensile properties according to heat input quantitatively. Minimum hardness was increased at high speed welding such as 80CPM and 120CPM in welding speed comparing with 40CPM. Also, in case of high speed welding such as 80CPM and 120CPM, tensile strength of weldments was increased about 10% comparing with low speed welding(40CPM).