The effect of beam oscillation on laser welding of AA2219-T87 under subatmospheric pressure

Yang，Fan1,2; Guo，Xing1,2; Yao，Xiyu3; Xia，Guangjie1,2; Chen，Ping1,2; Yan，Ming3; Long，Yu1,2

2022-04-01

10.1016/j.optlastec.2021.107782

OPTICS AND LASER TECHNOLOGY   影响因子和分区

0030-3992

1879-2545

Aluminum alloy AA2219 is widely used in the aerospace industry due to its high specific strength, and corrosion resistance, especially for the production of propellant tanks of space rockets. With the rapid development of laser sources, the welding of metal materials changes gradually from arc welding to laser welding, but pore defect drags the application of laser welding of aluminum alloy. To solve this bottleneck problem, this paper investigates the effect of laser beam oscillation on welding of AA2219 under subatmospheric pressure (LOWSP). The experimental results showed that LOWSP has significantly improved the surface morphology, penetration depth, microstructure,and mechanical properties of the weld seam. The EBSD testing analysis shows that the low-angle grain boundaries (LAGBs) take up the largest proportion in the microstructure with the increased proportion of equiaxed grains, and the grain size is further refined in LOWSP. When welded at the optimal laser beam oscillation frequency of 80 Hz under the pressure of 102 Pa, the pore was almost inhibited and the tensile strength of the weld seam reached 388.62 MPa, up to 83.16% of the base metal (the current level of the industry is generally between 300 ∼ 360 MPa). It is believed that the reduced boiling point of the aluminum alloy under subatmospheric pressure accelerated the molten metal flow rate, the stirring effect of laser beam oscillation on weld microstructure within molten pool significantly eliminate porosity, therefore the LOWSP process generated the refined grain size and the improved mechanical properties of the weld seam.

AA2219 aluminum alloy Laser oscillation welding Mechanical property Subatmospheric pressure environment Welding pool

SCI ; EI

英语

通讯

National Key R&D Pro-gram of China[2021YFE0203500] ; Special Funds for Local Scientific and Technological Development guided by the Central Government[2021ZYZX2060] ; Innovation Project ofGuangxi Graduate Education[JGY2021001] ; Under-graduate Teaching Reform Project of Higher Education in Guangxi Province[2021JGB116] ; Second Batch of New Engi-neering Research and Practice Projects of the Ministry of Education[E-JX20201527]

Optics ; Physics

Optics ; Physics, Applied

WOS:000793143800002

ELSEVIER SCI LTD

20215011327592

Aerospace industry ; Aluminum corrosion ; Corrosion resistance ; Corrosion resistant alloys ; Grain boundaries ; Grain size and shape ; Laser beam welding ; Laser beams ; Liquid metals ; Morphology ; Pressure effects ; Surface morphology ; Tensile strength ; Welds

Metallurgy and Metallography:531 ; Metallurgy:531.1 ; Welding:538.2 ; Welding Processes:538.2.1 ; Metals Corrosion:539.1 ; Aluminum:541.1 ; Aluminum Alloys:541.2 ; Laser Beam Interactions:744.8 ; Laser Applications:744.9 ; Mechanics:931.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

ENGINEERING

2-s2.0-85120935757

Scopus

1.Institute of Laser Intelligent Manufacturing and Precision Processing,School of Mechanical Engineering,Guangxi University,Nanning,530004,China
2.State Key Laboratory of Featured Metal Resources and Advanced Materials,Guangxi University,Nanning,530004,China
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Yang，Fan,Guo，Xing,Yao，Xiyu,et al. The effect of beam oscillation on laser welding of AA2219-T87 under subatmospheric pressure[J]. OPTICS AND LASER TECHNOLOGY,2022,148.

Yang，Fan.,Guo，Xing.,Yao，Xiyu.,Xia，Guangjie.,Chen，Ping.,...&Long，Yu.(2022).The effect of beam oscillation on laser welding of AA2219-T87 under subatmospheric pressure.OPTICS AND LASER TECHNOLOGY,148.

Yang，Fan,et al."The effect of beam oscillation on laser welding of AA2219-T87 under subatmospheric pressure".OPTICS AND LASER TECHNOLOGY 148(2022).