工艺参数对5A05铝合金搅拌摩擦焊接接头性能的影响

Influence of Process Parameters on 5A05 Aluminum Alloy in Friction Stir Welding

分别采用750r/min-47.5mm/min,950r/min-47.5mm/min,1180r/min-47.5mm/min,1500r/min-47.5mm/min四种工艺参数对3mm厚的5A05铝合金进行了搅拌摩擦焊接。结果表明,焊速为47.5mm/min、转速为1180r/min时,可获得较好的焊接接头,其抗拉强度达到最大值270MPa,是母材强度的98%。焊接接头的硬度分布存在一定的规律,沿焊缝中心两侧基本对称,由中心向两侧硬度逐渐降低,当到达TMAZ/HAZ过渡区时达到最低值,其后逐渐增加,最终达到与母材相等。拉伸断口表现为韧性断裂的特征。

Friction stir welding was applied to 5A05 aluminum alloy in 3 mm with 4 different parameters：750 r/min-47.5 mm/min, 950 r/min-47.5 mm/min, 1180 r/min-47.5 mm/min, 1500 r/rain-47.5 mm/min. The result shows that a successful welding could be achieved when the friction tool rotation speed is 1180 r/min and welding speed is 47.5mm/min, tensile strength can be up to 270MPa, which is 98% of that of the parent plate. Microhardness of the joint is symmetrically distributed along the welding line. Moving outwards from the center, the hardness decreases, and reaches a minimum in the TMAZ/HAZ and then gradually recovers to the level of the parent plate. The fracture of the alloy takes on a feature of toughness fracture.