5A06/2A14铝合金TIG焊接接头力学性能与微观组织

张国军; 冯立杰; 邱凯; 曹忠; 杨波; 毛旦平; 黎朝晖

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5A06/2A14铝合金TIG焊接接头力学性能与微观组织
Microstructure and mechanical properties of 5A06/2A14 aluminum alloy welding-joints
2018年48卷第12期页码：17-21
纸质出版：2018
DOI：
稿件说明：

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张国军, 冯立杰, 邱凯, 等. 5A06/2A14铝合金TIG焊接接头力学性能与微观组织[J]. 电焊机, 2018,48(12):17-21. DOI：

ZHANG Guojun, FENG Lijie, QIU Kai, et al. Microstructure and mechanical properties of 5A06/2A14 aluminum alloy welding-joints[J]. Eletric Welding Machine2018, 48(12): 17-21. DOI：

摘要

分别采用BJ380A、5A06和2325铝合金焊丝进行5A06/2A14异种铝合金TIG对接焊试验

分析接头的显微组织和力学性能。结果表明:焊缝无裂纹、气孔等缺陷;相比5A06母材一侧

2A14母材一侧热影响区晶粒长大明显

且较采用5A06/2325焊丝获得的焊缝晶粒

BJ380A焊丝获得的焊缝晶粒更粗大。采用3种焊丝获得的接头抗拉强度有所差异

最低约为5A06铝合金母材的83%。2325焊丝获得的接头抗拉强度最高

断口分析表明2325焊丝接头断裂处呈韧性断裂

断口以韧窝为主。

Abstract

The butt joining of 2 A14 aluminum alloy to 5 A06 aluminum alloy was conducted by TIG welding with BJ380 A

5 A06 and2325 aluminum alloy filler wires

and the microstructure and mechanical properties of the joints were analyzed. The results show that there are no cracks and pores in welds. The grain growth in the heat-affected zones（HAZ）near 2 A14 base metal is more obvious than that near 5 A06 base metal

and the grain is coarser in the weld made with BJ380 A filler wire than that in the weld made with 5 A06 or2325 filler wire. The tensile strength of joints is dissimilar by three filler wires

and the lowest value is about 83% of that of the 5 A06 aluminum alloy base metal. The tensile strength of the joint obtained by 2325 welding wire is the highest. Fracture analysis shows that the fracture of 2325 welding wire joint is ductile fracture

and the fracture is mainly dimple.