마그네슘 합금 AZ61 압출 판재의 마찰교반용접 특성 평가

초록

In this paper, a friction stir welding was applied for the extrusion plate of magnesium alloy AZ61 to confirm the difference in material properties of the weld due to the change of the rotational speed and the welding speed of the tool. Conditions of rotation speed were 400, 600 and 800rpm and welding speed of those were 200, 300 and 400mm/min. Dimension of the magnesium sheets were 500X100X5mm(length, width, thickness) and butt welding was employed. Tensile test was carried out after the welding process. As a result, 800rpm-200mm/min case showed the highest value of 85% compared to the base metal in tensile strength and 800rpm-400mm/min case demonstrated the highest value of 87% compared to the base metal in yield strength. Consequently, when the rotational speed was 800rpm, the strength of the overall weld was confirmed to be larger than the other conditions.