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31卷    第3期    总第264期    2021年3月

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文章编号:1004-0609(2021)-03-0556-10
载流搅拌摩擦焊对2219铝合金显微组织和力学性能的影响
白亚锋1,蒋晓青1,陈树君1,张洪玮2,韩 阳1,袁 涛1

(1. 北京工业大学 汽车结构部件先进制造技术教育部工程研究中心,北京 100124;
2. 北京新能源汽车股份有限公司,北京 100176
)

摘 要: 采用载流搅拌摩擦焊方法对6 mm厚AA2219铝合金板进行了不同脉冲电流大小的对接焊实验,研究焊接接头显微组织形貌和力学性能,结合断口宏观形貌及不同区域的硬度分布趋势,揭示电流对接头性能的影响。结果表明:随着电流增加,热输入增高,晶粒动态再结晶区域增多,接头抗拉强度和断后伸长率提升,拉伸试样断裂均发生在前进侧搅拌区和热机影响区的交界处。通过研究断口微观结构发现,载流接头更佳,增强了接头的韧性断裂。对焊接接头横截面硬度进行研究,其硬度变化趋势呈现“V”分布,焊核区硬度提高。焊缝中不同区域受搅拌针作用和热量分布情况不同,导致焊缝中析出相分布不同,影响了接头硬度,改善了焊接接头力学性能。

 

关键词: 2219铝合金;载流搅拌摩擦焊;显微组织;力学性能

Effect of electrically assisted friction stir welding on microstructure and mechanical properties of 2219 aluminium alloy
BAI Ya-feng1, JIANG Xiao-qing1, CHEN Shu-jun1, ZHANG Hong-wei2, HAN Yang1, YUAN Tao1

1. Beijing University of Technology, Advanced Manufacturing Technology of Automobile Structural Components Engineering Research Center of Ministry of Education, Beijing 100124, China;
2. Beijing New Energy Automobile Co., LTD., Beijing 100176, China

Abstract:The butt welding experiments of 6mm thick AA2219 aluminum alloy plates were carried out by friction stir welding with different pulse currents. Mechanical properties, microstructure, fracture macroscopic morphology and hardness distribution trend of the welded joints were studied. The effect of current on the performance of the joint was revealed. The results show that the dynamic recrystallization region, the tensile strength and elongation of the joint increase with increasing the current value and the heat input. The tensile samples fracture at the junction of weld nugget zone and thermo-mechanically affected zone at the advancing side. Through the study of fracture microstructure, it is found that the electrically assisted joints are better and the ductile fracture of the joints has enhanced. The cross section hardness of the welded joint was studied. The hardness change trend has a “V” shape distribution, and the hardness of weld nugget zone increases. The effect of pin on different areas of the weld is distinct with different heat distribution, resulting in different distributions of precipitates in the weld, which affects the hardness of the joints and improves the mechanical properties of the welded joint.

 

Key words: 2219 aluminum alloy; electrically assisted friction stir welding; microstructure; mechanical property

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

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

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