Microstructure and Mechanical Properties of Double-Sided Laser Swing Welding of 2195 Al-Li Alloy T-joints

Zhenglong Lei; Siyuan Bi; Xinrui Zhang; Bingwei Li; Peiyun Xia

doi:10.3788/CJL202249.0802003

Chinese Journal of Lasers, Volume. 49, Issue 8, 0802003(2022)

Microstructure and Mechanical Properties of Double-Sided Laser Swing Welding of 2195 Al-Li Alloy T-joints

Zhenglong Lei^1、*, Siyuan Bi¹, Xinrui Zhang¹, Bingwei Li¹, and Peiyun Xia²

¹State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China

²Shanghai Aerospace Equipments and Manufacturer Co., Ltd., Shanghai 200245, China

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Figures & Tables(19)

Fig. 1. Size of the skin-stringer T-joint

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Fig. 2. Movement path of circular swinging laser beam

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Fig. 3. Schematic of double-sided laser welding process

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Fig. 4. Transverse tensile specimen size and loading direction. (a) Specimen size; (b) loading direction

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Fig. 5. Axial tensile specimen size and loading direction. (a) Specimen size; (b) loading direction

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Fig. 6. Profile morphologies of weld. (a) Laser welding without swing; (b) laser welding with swing

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Fig. 7. Cross-sectional morphologies of joint. (a) Laser welding without swing; (b) laser welding with swing

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Fig. 8. Negative films of radiographic flaw detection of welded samples. (a) Laser welding without swing; (b) laser welding with swing

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Fig. 9. Double-sided laser swing welding T-joint structure of 2195 Al-Li alloys. (a) Macro morphology of welded joint；(b)(e) fusion line, columnar crystal area, and central equiaxed crystal area; (f) heat affected zone

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Fig. 10. Microstructure characteristics of equiaxed crystal zone in the middle of weld. (a) Laser welding with swing；(b) laser welding without swing

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Fig. 11. Microstructure characteristics of equiaxed fine-grained zone. (a) Laser welding with swing; (b) laser welding without swing

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Fig. 12. Comparison of tensile strength of welded joint

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$Axial tensile fracture of double-sided laser swing welding$

Fig. 13. Axial tensile fracture of double-sided laser swing welding

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$Transverse tensile fracture of double-sided laser swing welding. (a) Weld side fracture; (b) base material side fracture$

Fig. 14. Transverse tensile fracture of double-sided laser swing welding. (a) Weld side fracture; (b) base material side fracture

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Table 1. Main chemical composition and content of 2195 Al-Li alloys
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Table 1. Main chemical composition and content of 2195 Al-Li alloys
Element Li Cu Mg Zr Ag Fe Mn Si Al
Mass fraction /% 1.0 4.0 0.38 0.13 0.35 0.12 0.01 0.12 Bal.

Table 2. Main chemical composition and content of ER4047 welding wire
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Table 2. Main chemical composition and content of ER4047 welding wire
Element Si Fe Cu Mn Zn Ti Mg Al
Mass fraction /% 11.52 0.20 <0.001 0.01 0.001 0.01 0.01 Bal.

Table 3. Macro morphology of double-sided laser swing welding T-joint under different heat inputs
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Table 3. Macro morphology of double-sided laser swing welding T-joint under different heat inputs
Sample No. Process parameter Side morphology Cross-sectional morphology
1 v=1 m/min
P=2800 W
Q=1680 J/cm
2 v=2 m/min
P=3300 W
Q=990 J/cm
3 v=3 m/min
P=4000 W
Q=800 J/cm

Table 4. Macro morphology of double-sided laser swing welding T-joint under different swing amplitudes when the swing frequency is 200 Hz
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Table 4. Macro morphology of double-sided laser swing welding T-joint under different swing amplitudes when the swing frequency is 200 Hz
Sample No. Swing amplitude /mm Side morphology Cross-sectional morphology
4 0.6
5 0.8
6 1.0

Table 5. Macro morphology of double-sided laser swing welding T-joint under different swing frequencies when the swing amplitude is 0.8 mm
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Table 5. Macro morphology of double-sided laser swing welding T-joint under different swing frequencies when the swing amplitude is 0.8 mm
Sample No. Swing frequency /Hz Side morphology Cross-sectional morphology
7 100
8 200
9 300

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Zhenglong Lei, Siyuan Bi, Xinrui Zhang, Bingwei Li, Peiyun Xia. Microstructure and Mechanical Properties of Double-Sided Laser Swing Welding of 2195 Al-Li Alloy T-joints[J]. Chinese Journal of Lasers, 2022, 49(8): 0802003

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Paper Information

Category: laser manufacturing

Received: Jul. 26, 2021

Accepted: Aug. 24, 2021

Published Online: Mar. 23, 2022

The Author Email: Zhenglong Lei (leizhenglong@hit.edu.cn)

DOI:10.3788/CJL202249.0802003

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Main chemical composition and content of 2195 Al-Li alloys

Table 1. Main chemical composition and content of 2195 Al-Li alloys

Table 2. Main chemical composition and content of ER4047 welding wire

Table 2. Main chemical composition and content of ER4047 welding wire

Table 3. Macro morphology of double-sided laser swing welding T-joint under different heat inputs

Table 3. Macro morphology of double-sided laser swing welding T-joint under different heat inputs

Table 4. Macro morphology of double-sided laser swing welding T-joint under different swing amplitudes when the swing frequency is 200 Hz

Table 4. Macro morphology of double-sided laser swing welding T-joint under different swing amplitudes when the swing frequency is 200 Hz

Table 5. Macro morphology of double-sided laser swing welding T-joint under different swing frequencies when the swing amplitude is 0.8 mm

Table 5. Macro morphology of double-sided laser swing welding T-joint under different swing frequencies when the swing amplitude is 0.8 mm