Mechanical Properties of Laser Hybrid Welded Joint of 1000 MPa Ultrahigh-Strength Steel

Yanlong Ma; Hui Chen; Xu Zhao; Chengzhu Zhang; Zhiyong Zhu

doi:10.3788/CJL202148.0602113

Chinese Journal of Lasers, Volume. 48, Issue 6, 0602113(2021)

Mechanical Properties of Laser Hybrid Welded Joint of 1000 MPa Ultrahigh-Strength Steel

Yanlong Ma, Hui Chen^*, Xu Zhao, Chengzhu Zhang, and Zhiyong Zhu

Author Affiliations

Institute of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China

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Abstract Get PDF(in Chinese)

Figures & Tables(24)

Fig. 1. Sampling positions of tensile and impact samples. (a) Tensile sample; (b) impact sample

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Fig. 2. Weld macro-morphologies under different process conditions. (a) Weld surface and root at high welding speed; (b) weld surface and root at low welding speed; (c) droplet transfer at high welding speed; (d) droplet transfer at low welding speed

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Fig. 3. Weld flaw detection results under different process conditions. (a) Low welding speed; (b) high welding speed

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Fig. 4. Weld cross sectional areas for different wire welded joints and wire filling areas at different welding speeds

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Fig. 5. Thermal cycles. (a) Acquisition position for thermal cycle; (b) thermal cycle curves under different heat inputs

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Fig. 6. Microhardness. (a) Microhardness measurement position; (b) microhardness distributions of different wire welded joints

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Fig. 7. Weld seam and heat-affected zone microstructures of joint. (a) Weld seam of 90 wire welded joint; (b) weld seam of 80 wire welded joint; (c) heat-affected zone of 90 wire welded joint; (d) heat-affected zone of 80 wire welded joint

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$Tensile samples. (a) Tensile fracture positions; (b) tensile curves$

Fig. 8. Tensile samples. (a) Tensile fracture positions; (b) tensile curves

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$Macro-morphologies of tensile fractures. (a) Sample 1; (b) sample 2$

Fig. 9. Macro-morphologies of tensile fractures. (a) Sample 1; (b) sample 2

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$Micro-morphologies of tensile fractures. (a) Sample 1; (b) sample 2$

Fig. 10. Micro-morphologies of tensile fractures. (a) Sample 1; (b) sample 2

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$Micro-zone of joint tensile fracture$

Fig. 11. Micro-zone of joint tensile fracture

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Fig. 12. Impact absorbed energy at -40 ℃ for different welding wires at different welding speeds

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$Impact fracture paths in heat-affected zones. (a) Heat-affected zone of 90 wire welded joint at high welding speed; (b) heat-affected zone of 90 wire welded joint at low welding speed; (c) heat-affected zone of 80 wire welded joint at low welding speed$

Fig. 13. Impact fracture paths in heat-affected zones. (a) Heat-affected zone of 90 wire welded joint at high welding speed; (b) heat-affected zone of 90 wire welded joint at low welding speed; (c) heat-affected zone of 80 wire welded joint at low welding speed

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$Macro-morphologies of impact fractures at -40 ℃. (a) High-speed weld fracture; (b) low-speed weld fracture; (c) high-speed heat-affected zone fracture; (d) low-speed heat-affected zone fracture$

Fig. 14. Macro-morphologies of impact fractures at -40 ℃. (a) High-speed weld fracture; (b) low-speed weld fracture; (c) high-speed heat-affected zone fracture; (d) low-speed heat-affected zone fracture

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$Micro-morphologies of impact fractures at -40 ℃. (a) High speed weld seam of 80 wire welded joint; (b) high speed heat-affected zone of 80 wire welded joint; (c) high speed weld seam of 90 wire welded joint; (d) high speed heat- affected zone of 90 wire welded joint; (e) low speed weld seam of 80 wire welded joint; (f) low speed heat-affected zone of 80 wire welded joint; (g) low speed weld seam of 90 wire welded joint; (h) low speed heat-affected zone of 90 wire welded joint$

Fig. 15. Micro-morphologies of impact fractures at -40 ℃. (a) High speed weld seam of 80 wire welded joint; (b) high speed heat-affected zone of 80 wire welded joint; (c) high speed weld seam of 90 wire welded joint; (d) high speed heat- affected zone of 90 wire welded joint; (e) low speed weld seam of 80 wire welded joint; (f) low speed heat-affected zone of 80 wire welded joint; (g) low speed weld seam of 90 wire welded joint; (h) low speed heat-affected zone of 90 wire welded joint

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$Heat-affected zone impact fracture of high speed welding joint$

Fig. 16. Heat-affected zone impact fracture of high speed welding joint

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$Heat-affected zone impact fracture of low speed welding joint$

Fig. 17. Heat-affected zone impact fracture of low speed welding joint

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Table 1. Chemical compositions of base material and filling material(mass fraction, %)
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Table 1. Chemical compositions of base material and filling material(mass fraction, %)
Element C Si Mn P S Cr Mo Ni V Cu Al Nb
BS960E 0.18 0.08 1.25 0.013 0.003 0.20 0.50 0.02 0.04 0.02 0.04 0.02
MG90-G 0.07 0.40 1.76 0.006 0.006 0.64 0.63 2.60 -- -- -- --
ER80YM 0.06 0.37 1.49 0.008 0.005 0.34 0.35 2.84 -- 0.10 -- --

Table 2. Mechanical properties of base material and filling material
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Table 2. Mechanical properties of base material and filling material
Element Yield strength /MPa Tensile strength /MPa Elongation /% Impact fracture absorbed energy at -40 ℃/J
BS960E 978 1050 12.0 76
MG90-G 1076 1125 12.2 67
ER80YM 764 845 20 135

Table 3. Process parameters for laser-arc hybrid welding
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Table 3. Process parameters for laser-arc hybrid welding
V₁ /(m·min^-1) V₂ /(m·min^-1) P /kW I /A U /V
1.32 12 4.6 300 30
0.72 7.5 4.6 198 20

Table 4. Tensile properties of laser-arc hybrid welded joints
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Table 4. Tensile properties of laser-arc hybrid welded joints
Sample No. Tensile strength /MPa Elongation /%
1 1129 11.2
2 1145 12.5
3 1117 11.8
4 1084 12.2

Table 5. Chemical compositions of tensile fracture
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Table 5. Chemical compositions of tensile fracture
Element O Na Mg Al Si S Cl K Ca Mn Fe Cu
Mass fraction % 34.96 2.18 0.88 1.53 0.92 5.83 2.59 5.42 31.18 1.03 12.34 1.15

Table 6. Chemical compositions of heat-affected zone impact fracture of high speed welding joint
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Table 6. Chemical compositions of heat-affected zone impact fracture of high speed welding joint
Element C O Si Cl Fe Co
Mass fraction /% 13.67 29.71 0.25 0.17 55.69 0.51

Table 7. Chemical compositions of heat-affected zone impact fracture of low speed welding joint
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Table 7. Chemical compositions of heat-affected zone impact fracture of low speed welding joint
Element C Fe
Mass fraction /% 2.33 96.77

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Yanlong Ma, Hui Chen, Xu Zhao, Chengzhu Zhang, Zhiyong Zhu. Mechanical Properties of Laser Hybrid Welded Joint of 1000 MPa Ultrahigh-Strength Steel[J]. Chinese Journal of Lasers, 2021, 48(6): 0602113

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Paper Information

Category: Laser Material Processing

Received: Jun. 22, 2020

Accepted: Aug. 18, 2020

Published Online: Mar. 18, 2021

The Author Email: Chen Hui (xnrpt@swjtu.edu.cn)

DOI:10.3788/CJL202148.0602113

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Chemical compositions of base material and filling material(mass fraction, %)

Table 1. Chemical compositions of base material and filling material(mass fraction, %)

Table 2. Mechanical properties of base material and filling material

Table 2. Mechanical properties of base material and filling material

Table 3. Process parameters for laser-arc hybrid welding

Table 3. Process parameters for laser-arc hybrid welding

Table 4. Tensile properties of laser-arc hybrid welded joints

Table 4. Tensile properties of laser-arc hybrid welded joints

Table 5. Chemical compositions of tensile fracture

Table 5. Chemical compositions of tensile fracture

Table 6. Chemical compositions of heat-affected zone impact fracture of high speed welding joint

Table 6. Chemical compositions of heat-affected zone impact fracture of high speed welding joint

Table 7. Chemical compositions of heat-affected zone impact fracture of low speed welding joint

Table 7. Chemical compositions of heat-affected zone impact fracture of low speed welding joint