EFFECT SINGLE-STAGE AND THREE-STAGE AGING TREATMENT ON THE MICROSTRUCTURE, PHASE COMPOSITION, AND MECHANICAL PROPERTIES OF LASER-WELDED JOINT AL-CU-LI ALLOY
Full article
| Journal |
WELDING IN THE WORLD
ISSN: 0043-2288
|
| Output data |
Year: 2025,
Volume: 69,
Pages: 1915-1939
Pages count
: 25
DOI:
10.1007/s40194-025-02016-3
|
| Tags |
Fiber laser, welding · Al-Cu-Li alloy · Post-weld heat treatment · Synchrotron radiation · Transmission electron
microscopy · Microstructure · Phase composition · Mechanical properties |
| Authors |
Malikov Alexandr
1
,
Mironova Maria
1,4
,
Vitoshkin Igor
1
,
Beglyarov Egor
1
,
Gertsel Ilya
1,4
,
Karpov Evgeniy
1,2
,
Zakharchenko Kirill
1,2
,
Zavyalov Alexey
1,3
|
| Affiliations |
| 1 |
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch Russian Academy of Sciences
|
| 2 |
Lavrentyev Institute of Hydrodynamics Siberian Branch Russian Academy of Sciences
|
| 3 |
Budker Institute of Nuclear Physics of Siberian Branch Russian Academy of Sciences
|
| 4 |
Novosibirsk State University
|
|
Funding (1)
|
1
|
Российский научный фонд
|
23-79-00037
|
To this day, the structural strength of laser-welded joints of Al-Li alloys made with a fber laser has not been thoroughly
studied. In this research, high-strength laser-welded joints of Al-2.7Cu-1.8 alloy were obtained using a fber laser followed
by post-weld heat treatment. The laser-welding process parameters were optimized, including welding speed, radiation
power, and location of the focal spot. In addition, the infuence of these parameters on the microstructure of the welded joints
has been studied. After welding, the welded joints were heat treated (PWHT) in two modes to achieve optimal mechanical
properties. Changes in the structural and phase composition of the weld material before and after PWHT were examined
using synchrotron difraction and transmission electron microscopy. The obtained research results have shown that during
laser welding, copper-containing phases formed at the boundary of dendrites in the weld material, which leads to a reduction in strength. The process of post-weld heat treatment (PWHT) has led to the restoration of the phase composition in the
material of the weld. The cyclic (fatigue strength), dynamic (crack strength), and static (yield strength and ultimate tensile
strength) properties of laser-welded joints after PWHT have been studied. It has been observed that PWHT using mode 1
allows to achieve maximum fatigue and dynamic properties, while PWHT using mode 2 results in achieving maximum static
properties at various temperatures.