Research Progress on Microstructure and Defects in Al-Li Alloy Laser Welded Joint

XIA Ling; WU Youfa; YU Haisong; GAO Xuesong; ZHAN Xiaohong

doi:10.16080/j.issn1671–833x.2018.23/24.077

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Research Progress on Microstructure and Defects in Al-Li Alloy Laser Welded Joint

更新时间：2025-10-30

- Research Progress on Microstructure and Defects in Al-Li Alloy Laser Welded Joint
- Aeronautical Manufacturing Technology Vol. 61, Issue 23/24, (2018)
- 作者机构：
  
  1. 南京航空航天大学材料科学与技术学院,南京,211106
  2. 南京先进激光技术研究院,南京,211106
- 作者简介：
- 基金信息：
- DOI：10.16080/j.issn1671–833x.2018.23/24.077
  CLC：
- Published：2018
- 稿件说明：
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夏令，吴友发，余海松，高雪松，占小红. 铝锂合金激光焊接接头组织与缺陷研究进展[J]. 航空制造技术, 2018, 61(23/24): 77-81. XIA Ling1, WU Youfa1, YU Haisong1, GAO Xuesong2, ZHAN Xiaohong1. Research Progress on Microstructure and Defects in Al-Li Alloy Laser Welded Joint[J]. Aeronautical Manufacturing Technology, 2018, 61(23/24): 77-81.

XIA Ling, WU Youfa, YU Haisong, et al. Research Progress on Microstructure and Defects in Al-Li Alloy Laser Welded Joint[J]. Aeronautical Manufacturing Technology, 2018, 61(23/24).
夏令，吴友发，余海松，高雪松，占小红. 铝锂合金激光焊接接头组织与缺陷研究进展[J]. 航空制造技术, 2018, 61(23/24): 77-81. XIA Ling1, WU Youfa1, YU Haisong1, GAO Xuesong2, ZHAN Xiaohong1. Research Progress on Microstructure and Defects in Al-Li Alloy Laser Welded Joint[J]. Aeronautical Manufacturing Technology, 2018, 61(23/24): 77-81. DOI： 10.16080/j.issn1671–833x.2018.23/24.077.

XIA Ling, WU Youfa, YU Haisong, et al. Research Progress on Microstructure and Defects in Al-Li Alloy Laser Welded Joint[J]. Aeronautical Manufacturing Technology, 2018, 61(23/24). DOI： 10.16080/j.issn1671–833x.2018.23/24.077.

摘要

随着对飞行器性能的要求日趋提高，结构减重成为航空航天制造中的重要任务。铝锂合金由于其轻质高强等优良性能，被认为是极具发展前景与优势的航空航天轻质结构材料。同时，激光焊接技术被认为是最为有效的铝锂合金连接方式之一。但是，由于合金的特性及飞行器制造产业的要求，铝锂合金激光焊接技术仍存在诸多难点，介绍了铝锂合金激光焊焊缝特殊微观组织及常见焊接缺陷，重点讨论了等轴细晶区(EQZ)、焊接气孔、焊接裂纹及接头软化缺陷的形成机理及抑制措施。

Abstract

With the increasing demand for aircraft performance

structural weight reduction has become an important task in aerospace manufacturing industries. The Al-Li alloy exhibits many excellent performance including light weight

high strength

etc. These noteworthy advantages make it an ideal aerospace lightweight structural material with great development potential. At the same time

laser welding technology is considered as the most effective joining method for aluminum alloys. Nevertheless

the reliability of the welded structure is recognized as a challenge owing to the unique characteristics of the welded Al-Li alloy and the requirements of the civil aircraft industries. In this paper

the special micro-structure and defects in Al-Li alloy laser welded joint are introduced. The formation mechanism and inhibition measures of equiaxed grain along the fusion boundary (EQZ)

welding pores

welding cracks and joint softening defects are analyzed.

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