Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第25卷    第1期    总第190期    2015年1月

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文章编号:1004-0609(2015)-01-0043-06
7075/5A06异种铝合金TIG焊接头的显微组织和力学性能
廖传清1,宿国友1,高艳芳2 宋伟1,鲍宏伟1,高嘉爽1

(1. 上海航天设备制造总厂,上海 200245;
2. 上海锅炉厂有限公司,上海 200245
)

摘 要: 采用BJ380A和ER4043铝合金焊丝进行7075/5A06异种铝合金TIG焊对接试验,并对接头的显微组织和力学性能进行分析。结果表明:焊缝无裂纹,但存在分散的气孔;7075母材一侧热影响区晶粒长大较5A06母材一侧的明显,且采用BJ380A焊丝获得的焊缝晶粒较采用ER4043焊丝获得的焊缝晶粒粗大。采用两种焊丝获得的接头抗拉强度均为220 MPa左右,约为5A06铝合金母材的70%,且接头均断裂于焊缝处。显微硬度测试时,7075母材一侧热影响区出现软化现象,而5A06母材一侧热影响区出现硬化现象。另外,采用ER4043焊丝获得的焊缝硬度大于采用BJ380A焊丝获得的焊缝硬度。

 

关键字: 异种铝合金;钨极氩弧焊;显微组织;抗拉强度;显微硬度

Microstructure and mechanical properties of 7075/5A06 dissimilar aluminum alloy joints made by TIG welding
LIAO Chuan-qing1, SU Guo-you1, GAO Yan-fang2, SONG Wei1, BAO Hong-wei1, GAO Jia-shuang1

1. Shanghai Aerospace Equipments Manufacturer, Shanghai 200245, China;
2. Shanghai Boller Works Corporation Limited, Shanghai 200245, China

Abstract:The butt joining of 7075 aluminum alloy to 5A06 aluminum alloy was conducted by TIG welding with BJ380A and ER4043 aluminum alloy filler wires, and the microstructure and mechanical properties of the joints were analyzed. The results show that the dispersive pores without cracks are observed in welds. The grain growth in the heat-affected zones (HAZ) near 7075 base metal is more obvious than that near 5A06 base metal (BM), and the grain is coarser in the weld made with BJ380A filler wire than that in the weld made with ER4043 filler wire. The tensile strength of joints is about 220MPa, 70% of that of the 5A06 aluminum alloy base metal, and the fracture occurs in the welds during tensile test. The microhardness results reveal that softening appears in the heat-affected zones near 7075 base metal, but hardening exists in the heat-affected zones near 5A06 base metal. Moreover, the microhardness in the weld made with ER4043 filler wire is higher than that in the weld made with BJ380A filler wire.

 

Key words: dissimilar aluminum alloy; TIG welding; microstructure; tensile strength; microhardness

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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