超声能对铝合金搅拌摩擦焊焊缝成型的影响

杨坤玉; 彭彬; 袁朝桥; 宋佳寅; 贺地求

doi:10.13700/j.bh.1001-5965.2019.0485

超声能对铝合金搅拌摩擦焊焊缝成型的影响

doi: 10.13700/j.bh.1001-5965.2019.0485

杨坤玉^{1, 2, ,},
彭彬¹,
袁朝桥¹,
宋佳寅¹,
贺地求³

1.
长沙航空职业技术学院航空机械制造学院, 长沙 410124
2.
湖南省飞机维修工程技术研究中心, 长沙 410124
3.
中南大学高性能复杂制造国家重点实验室, 长沙 410083

基金项目:

湖南省自然科学基金委科教联合基金 2018JJ5062

详细信息

作者简介:
杨坤玉女, 博士, 教授。主要研究方向:轻金属的搅拌摩擦焊与超声辅助搅拌摩擦焊、航空金属件焊缝裂纹研究与修复

通讯作者:
杨坤玉, E-mail:yangkunyumail@163.com

中图分类号: TG453.9
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- 被引次数: 0
出版历程
- 收稿日期: 2019-09-06
- 录用日期: 2019-09-20
- 网络出版日期: 2020-08-20

Influence of ultrasonic energy on weld formation of friction stir welding of aluminum alloy

1.
Department of Aeronautical Machinery Manufacturing, Changsha Aeronautical Vocational and Technical College, Changsha 410124, China
2.
Hunan Aircraft Maintenance Engineering Technology Research Center, Changsha 410124, China
3.
State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China

Funds:

Hunan Provincial Natural Science Foundation Committee Science and Education Joint Fund Project of China 2018JJ5062

More Information

Corresponding author: YANG Kunyu. E-mail:yangkunyumail@163.com

摘要

摘要:
为了探究超声能对铝合金搅拌摩擦焊（FSW）焊缝成型及焊缝缺陷的影响机理，采用数值模拟和试验验证相结合的方法，设计了同等工艺条件下的超声辅助搅拌摩擦焊（UAFSW）与搅拌摩擦焊的流场仿真和试验对比。通过分析2种焊缝横截面上热塑性金属的流动矢量和金相组织，研究了超声能导入后焊缝热塑性金属的流动变化情况。分析结果表明：超声能导入，使铝合金搅拌摩擦焊焊缝内金属的水平绕流方式演变成倾斜绕流方式，并使上下2个独立流场实现交汇统一，而且使焊缝金属最低流速提升近一个数量级，焊缝成型完整度明显增强，焊缝缺陷率大幅降低。
- 超声能 /
- 铝合金 /
- 搅拌摩擦焊 /
- 倾斜绕流 /
- 焊缝成型 /
- 缺陷率
Abstract:
In order to find out the influence mechanism of ultrasonic energy on the weld formation and weld defects of aluminum alloy Friction Stir Welding (FSW), the combined method of numerical simulation and experimental verification was used to design the comparison of the flow field simulation and test between Ultrasonic Assisted Friction Stir Welding (UAFSW) and friction stir welding under the same process conditions. The flow vector and metallographic structure of the thermoplastic metal on the cross section of the two types of weld are analyzed to find out the flow changes of the weld metal after ultrasonic introduction. The analysis results show that the introduction of ultrasonic energy makes the horizontal flow pattern of the metal in the friction stir welding of aluminum alloy evolve into a sloping flow mode, the two upper and lower independent flow fields are unified, and the lowest flow rate of the weld metal has up to one order of magnitude improvement. The integrity of weld formation is significantly enhanced, and the weld defect rate is greatly reduced.
- ultrasonic energy /
- aluminum alloy /
- friction stir welding /
- sloping flow /
- weld formation /
- defect rate

HTML全文

图 1 搅拌头与焊件接触几何模型

Figure 1. Geometric model of contact betweenmixing head and weldment

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图 2 FSW与UAFSW过程整体流动迹线图对比^[17]

Figure 2. Comparison of overall flow trace between FSW and UAFSW processes^[17]

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图 3 5×10^-6s时刻搅拌头表面材料瞬时流动矢量对比

Figure 3. Comparison of instantaneous flow vector of surfacematerial of mixing head at 5×10^-6s

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图 4 2×10^-4s时刻搅拌头表面材料瞬时流动矢量对比

Figure 4. Comparison of instantaneous flow vector of surface material of mixing head at 2×10^-4s

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图 5 3×10^-4s时刻UAFSW搅拌头前后材料瞬时流动矢量

Figure 5. Material instantaneous flow vector distribution before and behind UAFSW tool at 3×10^-4s

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图 6 表面贴铜箔的焊件

Figure 6. Weldment with copper foil on the surface

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图 7 FSW焊缝横截面金相图

Figure 7. FSW weld cross-section metallographic

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图 8 UAFSW焊缝横截面金相图

Figure 8. UAFSW weld cross-section metallographic

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图 9 工艺窗口外FSW焊缝与UAFSW焊缝成型对比

Figure 9. Comparison of weld formation outside processwindow between FSW and UAFSW

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图 10 同等条件下FSW与UAFSW焊缝横截面金相对比

Figure 10. Comparison of metallographic weld cross-section between FSW and UAFSW under thesame process conditions

下载: 全尺寸图片幻灯片

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