• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (6): 39-45.doi: 10.3901/JME.2019.06.039

• 特邀专栏:焊接力学与结构设计 • 上一篇    下一篇

铝/黄铜异种金属搅拌摩擦焊搭接接头显微组织与力学性能

于明润1, 赵洪运2, 蒋智华2, 周利1,2, 黄永宪1, 宋晓国1,2   

  1. 1. 哈尔滨工业大学先进焊接与连接国家重点实验室 哈尔滨 150001;
    2. 哈尔滨工业大学(威海)山东省特种焊接技术重点实验室 威海 264209
  • 收稿日期:2018-08-13 修回日期:2019-02-20 出版日期:2019-03-20 发布日期:2019-03-20
  • 作者简介:于明润,男,1992年出生,博士研究生。主要从事异种材料连接方面的研究。E-mail:yu.larry@foxmail.com;周利,男,1982年出生,博士,副教授。主要从事先进连接技术方面的研究。E-mail:zhouli@hit.edu.cn
  • 基金资助:
    国家自然科学基金(51205084)和教育部留学回国人员科研启动基金资助项目。

Research on Microstructure and Mechanical Properties of Friction Stir Lap Welded Aluminum/Brass Dissimilar Joint

YU Mingrun1, ZHAO Hongyun2, JIANG Zhihua2, ZHOU Li1,2, HUANG Yongxian1, SONG Xiaoguo1,2   

  1. 1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001;
    2. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209
  • Received:2018-08-13 Revised:2019-02-20 Online:2019-03-20 Published:2019-03-20

摘要: 采用搅拌摩擦焊方法对5052铝合金及H62黄铜异种金属进行搭接,搅拌头转速固定为1 000 r/min,焊速为100~300 mm/min,对接头微观组织和力学性能进行研究。结果表明:搭接接头铝侧分为焊核区、热机影响区和热影响区。接头铝侧与搅拌头直接作用的区域,晶粒发生一定的细化。搭接界面处两板间分界明显,界面处有黄铜和铝的机械混合,且有金属间化合物产生。接头显微硬度分布表明铝侧焊核区显微硬度最高,硬度最低点在热影响区。界面处的硬度明显大于铝及黄铜母材。随着焊速的增大,接头拉剪载荷先增大后减小。接头拉伸时断于界面区,断口为解理断裂。

关键词: 搅拌摩擦焊搭接, 力学性能, 铝/铜异种金属, 微观组织

Abstract: 5052 aluminium alloy and H62 brass dissimilar metals are friction stir lap welded. The rotation speed is kept constant at 1 000 r/min with welding speed varying from 100 mm/min to 300 mm/min. Microstructure and mechanical properties of the joint are studied. The joint at Al side is divided into weld nugget zone, thermo-mechanically affected zone and heat-affected zone. Grains are refined within the area contacted with the welding tool at Al side. Obvious dividing line is formed between the two plates at the Al/Brass interface with the existence of brass with different size and shape. There are interface compounds produced and mechanical mixture of brass and aluminium produced near the brass at the interfaces. Hardness distribution of joint cross-section along the aluminum side show hardness at welding nugget are highest and the lowest appear on the heat affected zone. Hardness at the interface is significantly higher than that of Al and Brass base metal. With the increasing welding speed, the tensile shear strength increases first and then decreases. Tensile test indicates that the joint fractures at interface layer of the brass side with cleavage fracture surface.

Key words: Al/Cu dissimilar metals, friction stir lap welding, mechanical properties, microstructure

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