Grain‐Boundary Regulation of Double‐Sided Laser Weld of Aluminum‐Lithium Alloy T‐joint

Bing Han; Xi Chen; Meng Jiang; Liangxiong Dong; Wanghui Xu; Jixiang Gao; Jiang Bi; Guochao Hu; Rui Tian; Jing Yuan; Chunlin Dong; Yanbin Chen

doi:10.3788/CJL241045

Chinese Journal of Lasers, Volume. 52, Issue 4, 0402106(2025)

Grain‐Boundary Regulation of Double‐Sided Laser Weld of Aluminum‐Lithium Alloy T‐joint

Bing Han^1、*, Xi Chen^2,3, Meng Jiang^2,3, Liangxiong Dong¹, Wanghui Xu⁴, Jixiang Gao⁵, Jiang Bi⁶, Guochao Hu¹, Rui Tian¹, Jing Yuan¹, Chunlin Dong⁴, and Yanbin Chen^2,3

Author Affiliations

¹School of Shipping, Guangzhou Maritime University, Guangzhou 510725, Guangdong , China

²State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, Heilongjiang , China

³Harbin Hit Weld Technology Co., Ltd., Harbin 150040, Heilongjiang , China

⁴School of Intelligent Manufacturing, Guangzhou Maritime University, Guangzhou 510725, Guangdong , China

⁵School of Mechatronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, Guangdong , China

⁶School of Mechanical Engineering, Yanshan University, Qinhuangdao 066000, Hebei , China

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Figures & Tables(14)

Fig. 1. Double-sided laser synchronous welding process. (a) Welding system; (b) welding process diagram

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Fig. 2. Preparation and observation position of metallographic sample on weld surface

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Fig. 3. Preparation and observation positions of metallographic sample on cross section of weld

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Fig. 4. Test specimen sizes and loading methods. (a) Transverse tensile specimen; (b) longitudinal tensile specimen

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Fig. 5. Influence of wire composition on crack distribution of T-joint weld. (a) Wire 1#; (b) wire 2#; (c) wire 3#; (d) wire 4#; (e) wire 5#

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$Influence of Si mass fraction in wire on microstructure of T-joint weld. (a)‒(c) Wire 1#; (d)‒(f) wire 2#; (g)‒(i) wire 3#$

Fig. 6. Influence of Si mass fraction in wire on microstructure of T-joint weld. (a)‒(c) Wire 1#; (d)‒(f) wire 2#; (g)‒(i) wire 3#

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$Influence of Cu mass fraction in wire on microstructure of T-joint weld. (a)‒(c) Wire 4#; (d)‒(f) wire 5#$

Fig. 7. Influence of Cu mass fraction in wire on microstructure of T-joint weld. (a)‒(c) Wire 4#; (d)‒(f) wire 5#

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Fig. 8. Influence of wire composition on transverse tensile strength of T-joint

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Fig. 9. Influence of wire composition on longitudinal compression load of T-joint

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$Influence of wire composition on grain boundary microstructure of T-joint tensile fracture. (a) Wire 1#; (b) wire 4#$

Fig. 10. Influence of wire composition on grain boundary microstructure of T-joint tensile fracture. (a) Wire 1#; (b) wire 4#

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Table 1. Chemical compositions of base metals (mass fraction, %)
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Table 1. Chemical compositions of base metals (mass fraction, %)
Base metal Cu Li Zn Mg Mn Zr Ag Sr Si Fe Ti Al
2060 3.90 0.80 0.32 0.70 0.29 0.10 0.34 ‒ 0.02 0.02 <0.10 Bal.
2099 2.520 1.870 1.190 0.497 0.309 0.082 ‒ 0.060 ‒ ‒ ‒ Bal.

Table 2. Chemical compositions of welding wires (mass fraction, %)

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Table 2. Chemical compositions of welding wires (mass fraction, %)

Filler wire No.	Si	Cu	Zr	Ti	Zn	Mg	Mn	B	Al
1#	4.18	2.09	0.16	0.15	0.08	0.05	0.01	0.01	Bal.
2#	5.25	2.11	0.17	0.14	0.10	0.05	0.01	0.02	Bal.
3#	7.23	2.04	0.16	0.16	0.10	0.04	0.01	0.01	Bal.
4#	5.41	6.17	0.17	0.16	0.09	0.05	0.32	0.01	Bal.
5#	5.45	7.13	0.17	0.15	0.10	0.05	0.30	0.01	Bal.

Table 3. Double-sided laser synchronous welding parameters for aluminum-lithium alloy T-joint
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Table 3. Double-sided laser synchronous welding parameters for aluminum-lithium alloy T-joint
Parameter
Laser
wavelength /μm
Laser
power /W
Laser scanning
speed /（m·min^-1）
Wire feeding
speed /（m·min^-1）
Wire
extension /mm
Shielding gas
flow rate /（L·min^-1）
Value 1.07 3000 10.0 4.3 8.0 15.0

Table 4. EDS analysis results for selected regions in Fig. 10 (mass fraction, %)
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Table 4. EDS analysis results for selected regions in Fig. 10 (mass fraction, %)
Selected region Si Cu Zn Mg Al
A 22.24 1.78 0.89 0.42 Bal.
B 0.18 2.03 0.72 0.36 Bal.
C 16.25 1.26 0.63 0.31 Bal.
D 1.16 13.74 0.68 0.33 Bal.
E 20.51 4.73 0.57 0.29 Bal.
F 1.78 1.21 0.62 0.49 Bal.

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Bing Han, Xi Chen, Meng Jiang, Liangxiong Dong, Wanghui Xu, Jixiang Gao, Jiang Bi, Guochao Hu, Rui Tian, Jing Yuan, Chunlin Dong, Yanbin Chen. Grain‐Boundary Regulation of Double‐Sided Laser Weld of Aluminum‐Lithium Alloy T‐joint[J]. Chinese Journal of Lasers, 2025, 52(4): 0402106

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