Microstructure and mechanical properties of 7055 aluminum alloy by double-sided processes of friction stir welding

TANG Huawei; GAO Jia; HUANG Zheng; SHEN Haoran; XU Hui

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Microstructure and mechanical properties of 7055 aluminum alloy by double-sided processes of friction stir welding
Vol. 48, Issue 10, Pages: 13-16(2018)
Published：2018
DOI：
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DOI：

TANG Huawei, GAO Jia, HUANG Zheng, et al. Microstructure and mechanical properties of 7055 aluminum alloy by double-sided processes of friction stir welding[J]. Eletric Welding Machine2018, 48(10): 13-16. DOI：

摘要

采用8 mm针长搅拌工具对12 mm厚的7055-T6铝合金进行双面对接焊接试验

并对焊接接头进行显微组织观察和力学性能测试。结果表明:其接头宏观形貌无明显的塑性流动痕迹;第一道和第二道焊接前进侧位于同一侧时

接头抗拉强度平均值为452 MPa

接头强度可达母材的75%

优于前进侧位于两侧时的焊接接头性能;接头横向显微硬度呈"W"型分布

最低值出现在后退侧热机影响区与热影响区过渡区

为101.7 HV;接头纵向显微硬度显示

第一道焊缝显微硬度值低于第二道焊缝;拉伸试样断口形貌存在明显韧窝特征

属于韧性断裂。

Abstract

Using 8 mm length friction stir tool

7055-T6 aluminum alloy with the thickness of 12 mm was double-sided welded by friction stir welding（FSW）

and the microstructure of the welded joint was observed

meanwhile

the mechanical properties were tested.The results show that the maco morphology of weld joint has no obvious plastic flow trace. When the AS on the same side

the tensile strength of the welded joint can reach 452 MPa

the joint coefficient of strength can reach 75%

which is better than the AS on the different side. The horizontal microhardness of weld is "W" distribution. The minimum of the microhardness is 101.7 HV on transition zone between TMAZ and BMZ of RS. The vertical microhardness of weld shows that the front side is lower than the back side. The morphology of tensile fracture surface appears dimples ductile fracture characteristice

which is ductile rupture.