Effect of V Interlayer on Microstructure and Mechanical Properties of TC4/QP980 Coaxial Dual‐Beam Laser Welded Joint

Nan Li; Dexi Wang; Yawen Tang; Hanxuan Zhang; Hongyang Wang; Liming Liu

doi:10.3788/CJL241459

Chinese Journal of Lasers, Volume. 52, Issue 12, 1202101(2025)

Effect of V Interlayer on Microstructure and Mechanical Properties of TC4/QP980 Coaxial Dual‐Beam Laser Welded Joint

Nan Li, Dexi Wang, Yawen Tang, Hanxuan Zhang, Hongyang Wang^*, and Liming Liu

Liaoning Province Key Laboratory of Advanced Joining Technology, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning , China

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Figures & Tables(15)

Fig. 1. Schematic diagrams. (a) Welding process; (b) tension sample

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Fig. 2. Morphologies of weld surface and section

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Fig. 3. Result of tensile test

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Fig. 4. QP980-side interface with no V interlayer. (a) Microstructure; (b) elemental distribution; (c) microstructure at C point in Fig. 2

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Fig. 5. QP980-side interface with V interlayer. (a) Microstructure of 0.05 mm-V joint; (b) microstructure of 0.10 mm-V joint;

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Fig. 6. TC4-side interface without V interlayer. (a) Microstructure; (b) elemental distribution

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Fig. 7. TC4-side interface with V interlayer. (a)‒(c) Microstructures of 0.05 mm-V joint; (d)‒(f) microstructures of 0.10 mm-V joint

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Fig. 8. Elemental distributions. (a) Interface III; (b) interface IV

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Fig. 9. Schematic diagram of dual-beam laser welding with filler assisted by V interlayer

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Fig. 10. Schematic diagrams of microstructure optimization of TC4 side interface

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Table 1. Chemical compositions of base materials and filler wire(mass fraction,%)
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Table 1. Chemical compositions of base materials and filler wire(mass fraction,%)
Material Ti Fe Cu Al V Mn Si C
TC4 Bal. 5.900 3.800 0.100
QP980 Bal. 0.046 2.410 1.310 0.200
CuSi3Mn1 0.020 Bal. 0.800 2.900

Table 2. Welding process parameters

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Table 2. Welding process parameters

Pulsed laser

Spot diameter

of pulsed laser

D_p/mm

Continuous

laser power

P_c /W

Spot diameter

of continuous

laser D_c/mm

Welding

speed V₀ /

（m·min^-1）

Filler feed

rate V_f /

（m·min^-1）

Current

I /A

Width

t /ms

Frequency

f /Hz

127

2.0

1.2

1000

2.2

0.3

2.4

Table 3. EPMA analysis results of marked points in Fig. 4

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Table 3. EPMA analysis results of marked points in Fig. 4

Point No.	Atomic fraction /%							Possible phase
Point No.	Cu	Fe	Ti	V	Si	Al	Mn	Possible phase
A₁	0	94.65	0	0	2.95	0.06	2.34	Fe
B₁	7.00	82.77	0.13	0.22	8.92	0.94	0.02	（Fe）ss
C₁	89.56	6.98	0.02	0.05	1.73	0.02	1.64	（Cu）ss
D₁	5.04	82.58	0.255	0.11	13.07	0.57	0	（Fe）ss
E₁	94.33	2.73	0.06	0	1.77	0.16	0.95	α-Cu
F₁	0.03	0.05	86.84	3.81	0.03	9.23	0.01	α-Ti
G₁	16.11	5.68	64.07	4.47	1.43	7.84	0.40	α-Ti+Ti₂Cu+TiFe
H₁	23.00	16.16	51.48	2.22	1.39	5.17	0.58	TiCu+TiFe

Table 4. EPMA analysis results of marked points in Fig. 6
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Table 4. EPMA analysis results of marked points in Fig. 6
Point
No.
Atomic fraction /%
Possible
phase
Cu Fe Ti V Si Al Mn
A₂ 0.03 0.50 86.84 3.81 0.03 9.23 0 α-Ti
B₂ 44.03 0.48 49.01 2.10 0.52 3.67 0.19 TiCu
C₂ 1.23 0.50 60.08 3.54 34.50 0.01 0.13 Ti₅Si₃
D₂ 92.19 0.13 4.34 0.04 0.04 2.24 1.02 α-Cu

Table 5. EPMA analysis results of marked points in Fig. 7

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Table 5. EPMA analysis results of marked points in Fig. 7

Point No.	Atomic fraction /%							Possible phase
Point No.	Cu	Fe	Ti	V	Si	Al	Mn	Possible phase
A₃	94.33	2.73	0.06	0	1.77	0	1.11	α-Cu
B₃	5.22	59.46	0	26.01	8.96	0	0.35	（Fe， V， Cu， Si） ss
C₃	0.07	0.51	0.04	99.24	0.09	0.02	0.03	V
D₃	12.53	0.62	60.41	19.41	1.00	5.83	0.20	（Ti， V） ss + Ti₂Cu
E₃	41.95	0.24	49.81	3.82	0.98	3.14	0.06	TiCu
F₃	31.64	0.40	59.42	4.00	0.98	3.46	0.10	Ti₂Cu
G₃	15.90	0.70	67.99	8.08	1.37	5.74	0.22	（Ti， Cu） ss + Ti₂Cu

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Nan Li, Dexi Wang, Yawen Tang, Hanxuan Zhang, Hongyang Wang, Liming Liu. Effect of V Interlayer on Microstructure and Mechanical Properties of TC4/QP980 Coaxial Dual‐Beam Laser Welded Joint[J]. Chinese Journal of Lasers, 2025, 52(12): 1202101

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