Properties of Marine High-Strength Steel by High-Efficiency Laser-MAG Hybrid Welding

Zhicheng Jing; Guoyu Zhang; Zijian Wang; Wuhong Li; Chuanqiang Wang; Guojian Xu; Dongsa Chen; Wei Wang

doi:10.3788/CJL201946.0802005

Chinese Journal of Lasers, Volume. 46, Issue 8, 0802005(2019)

Properties of Marine High-Strength Steel by High-Efficiency Laser-MAG Hybrid Welding

Zhicheng Jing^1、**, Guoyu Zhang¹, Zijian Wang¹, Wuhong Li², Chuanqiang Wang², Guojian Xu^1、*, Dongsa Chen¹, and Wei Wang³

Author Affiliations

¹ School of Materials Science and Engineering, Shenyang University of Technology,Shenyang, Liaoning 110870, China

² Nanjing Zhongke Raycham Laser Technology Co., Ltd., Nanjing, Jiangsu 210038, China

³ School of Mechanical Engineering, Shenyang University of Technology, Shenyang, Liaoning 110870, China

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Figures & Tables(14)

Fig. 1. Optical microstructure of BM

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Fig. 2. Schematic of EH36 marine high-strength steel welding

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Fig. 3. Morphologies of WM. (a) Front morphology; (b) back morphology; (c) cross-section of weld and zone division

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Fig. 4. Microstructures of WM in arc action zone. (a) State of grain growth; (b) boundary of grains; (c) interior of grains; (d) V-shaped bonds

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Fig. 5. Microstructures of WM in laser action zone. (a) State of grain growth; (b) microstructure

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Fig. 6. Microstructures near fusion line of welded joint in arc action zone. (a) Fusion line; (b) coarse grain zone; (c) fine grain zone; (d) zone of incomplete phase change recrystallization

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Fig. 7. Microhardness distribution curves at different positions of welded joint

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$Tensile test results of welded joints. (a) Macroscopic photo of fractured specimens; (b) fracture morphology of tensile specimen$

Fig. 8. Tensile test results of welded joints. (a) Macroscopic photo of fractured specimens; (b) fracture morphology of tensile specimen

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Fig. 9. Bending test results of welded joint. (a) Macroscopic photo of bended specimens; (b) bending morphology of welds

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Fig. 10. Fracture morphologies at different positions of impact specimens. (a) WM; (b) HAZ; (c) BM

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Table 1. Chemical compositions of EH36 steel and GHS50NS wire (mass fraction, %)
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Table 1. Chemical compositions of EH36 steel and GHS50NS wire (mass fraction, %)
Element C Si Mn P S Ni Nb Ti Al Fe
EH36 0.10 0.37 1.47 0.02 0.001 0.13 0.031 0.012 0.023 Bal.
GHS50NS 0.08 0.81 1.24 0.005 0.001 0.46 - - - Bal.

Table 2. Optimal processing parameters of laser-MAG hybrid welding

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Table 2. Optimal processing parameters of laser-MAG hybrid welding

Welding parameter	Content
Laser power /kW	10
Welding speed /(m·min^-1)	1.5
Wire feeding speed /(m·min^-1)	14.2
Heat sources distance /mm	3
Defocus amount /mm	0
Dry extension of welding /mm	20
Arc current /A	400
Welding voltage /V	31.1
Shielding gas	Argon
Flow rate of shielding gas /(L·min^-1)	20

Table 3. Tensile test results of EH36 laser-MAG hybrid welded joints
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Table 3. Tensile test results of EH36 laser-MAG hybrid welded joints
Number σ_b /MPa σ_s /MPa A /% Z /% Fracture position t /℃
1 525.7 364.92 21.68 61.68 BM 23
2 525.7 366.19 20.93 61.35 BM 23
3 516.9 352.15 25.58 60.18 BM 23
4 518.4 361.94 21.42 60.76 BM 23

Table 4. Impact test results of EH36 laser-MAG hybrid welded joint and base metal
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Table 4. Impact test results of EH36 laser-MAG hybrid welded joint and base metal
Impactposition Groove Impactwork /J Average /J t /℃
WM V 46, 57, 68 57 -20
HAZ V 56, 54, 48 53 -20
BM V 48, 56, 53 52 -20

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Zhicheng Jing, Guoyu Zhang, Zijian Wang, Wuhong Li, Chuanqiang Wang, Guojian Xu, Dongsa Chen, Wei Wang. Properties of Marine High-Strength Steel by High-Efficiency Laser-MAG Hybrid Welding[J]. Chinese Journal of Lasers, 2019, 46(8): 0802005

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Paper Information

Category: laser manufacturing

Received: Jan. 29, 2019

Accepted: Mar. 27, 2019

Published Online: Aug. 13, 2019

The Author Email: Jing Zhicheng (xuguojian1959@qq.com), Xu Guojian (xuguojian1959@qq.com)

DOI:10.3788/CJL201946.0802005

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Chemical compositions of EH36 steel and GHS50NS wire (mass fraction, %)

Table 1. Chemical compositions of EH36 steel and GHS50NS wire (mass fraction, %)

Table 2. Optimal processing parameters of laser-MAG hybrid welding

Table 2. Optimal processing parameters of laser-MAG hybrid welding

Table 3. Tensile test results of EH36 laser-MAG hybrid welded joints

Table 3. Tensile test results of EH36 laser-MAG hybrid welded joints

Table 4. Impact test results of EH36 laser-MAG hybrid welded joint and base metal

Table 4. Impact test results of EH36 laser-MAG hybrid welded joint and base metal