Laser-Arc Hybrid Welding Process and Joint Performances of 6106-T6 Aluminum Alloy Profiles for High Speed Trains

Xiaohui Han; Shuaizhen Li; Zhendong Mao; Peng Wen; Zhongxiu Li; Shikai Wu

doi:10.3788/CJL201946.1202004

Chinese Journal of Lasers, Volume. 46, Issue 12, 1202004(2019)

Laser-Arc Hybrid Welding Process and Joint Performances of 6106-T6 Aluminum Alloy Profiles for High Speed Trains

Xiaohui Han^1、**, Shuaizhen Li¹, Zhendong Mao¹, Peng Wen^2,3, Zhongxiu Li^2,3, and Shikai Wu^2,3、*

Author Affiliations

¹CRRC Qingdao Sifang Co., Ltd., Qingdao, Shandong 266111, China

²Key Laboratory of Trans-Scale Laser Manufacturing Technology, Ministry of Education, Beijing 100124, China

³Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China

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Figures & Tables(12)

Fig. 1. Diagram of welding setup

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Fig. 2. Sizes of tensile and fatigue specimens

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Fig. 3. Cross-sections of hybrid welded joints. (a) Laser-CMT hybrid welded joint; (b) laser-VPTIG hybrid welded joint; (c) laser-MIG hybrid welded joint

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Fig. 4. Microstructures of different hybrid welded joints. (a) Fusion line upper section of laser-CMT hybrid welded joint; (b) fusion line upper section of laser-VPTIG hybrid welded joint; (c) fusion line upper section of laser-MIG hybrid welded joint; (d) fusion line lower section of laser-CMT hybrid welded joint; (e) fusion line lower section of laser-VPTIG hybrid welded joint; (f) fusion line lower part of laser-MIG hybrid welded joint; (g) upper part of center of laser-CMT hybrid weld; (h) lower par

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Fig. 5. Tensile strength of three kinds of hybrid welded joints

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Fig. 6. Microhardness of three kinds of hybrid welded joints

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Fig. 7. S-N curves of three kinds of hybrid welded joints

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Fig. 8. Microstructures of fatigue crack initiation zone of three kinds of hybrid welded joints.(a) Laser-CMT hybrid welded joint; (b) laser-VPTIG hybrid welded joint; (c) laser-MIG hybrid welded joint

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$Fatigue fracture morphologies of three kinds of hybrid welded joints. (a) Fatigue crack initiation zone of laser-CMT hybrid welded joint; (b) extended zone of laser-CMT hybrid welded joint; (c) instantaneous break zone of laser-CMT hybrid welded joint; (d) fatigue crack initiation zone of laser-VPTIG hybrid welding joint; (e) extended zone of laser-VPTIG hybrid welding joint; (f) instantaneous break zone of laser-VPTIG hybrid welded joint; (g) fatigue crack initiation zone of laser-MIG hybrid we$

Fig. 9. Fatigue fracture morphologies of three kinds of hybrid welded joints. (a) Fatigue crack initiation zone of laser-CMT hybrid welded joint; (b) extended zone of laser-CMT hybrid welded joint; (c) instantaneous break zone of laser-CMT hybrid welded joint; (d) fatigue crack initiation zone of laser-VPTIG hybrid welding joint; (e) extended zone of laser-VPTIG hybrid welding joint; (f) instantaneous break zone of laser-VPTIG hybrid welded joint; (g) fatigue crack initiation zone of laser-MIG hybrid we

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Table 1. Chemical compositions of 6106 aluminum alloy and welding wire
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Table 1. Chemical compositions of 6106 aluminum alloy and welding wire
Material Mass fraction /%
Si Fe Cu Mn Mg Cr Zn Ti Al
6106-T6 0.30-0.60 ≤0.35 ≤0.25 0.05-0.20 0.40-0.80 ≤0.20 ≤0.10 - Bal.
ER5356 0.057 0.12 0.011 <0.13 4.9 0.065 0.13 0.11 Bal.

Table 2. Tensile properties of 6106-T6 aluminum alloy profiles at room temperature
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Table 2. Tensile properties of 6106-T6 aluminum alloy profiles at room temperature
Thicknesst /mm YieldstrengthR_p0.2 /MPa TensilestrengthR_m /MPa Elongation /%
≤6 ≥200 ≥250 8

Table 3. Optimized welding parameters of three welding modes
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Table 3. Optimized welding parameters of three welding modes
Welding mode Laser power /W Welding speed /(m·min^-1) Wire feeding speed /(m·min^-1) Welding current /A
Laser-CMT 3000 5 6 93
Laser-VPTIG 3500 5 7 200
Laser-MIG 7000 4 11 250

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Xiaohui Han, Shuaizhen Li, Zhendong Mao, Peng Wen, Zhongxiu Li, Shikai Wu. Laser-Arc Hybrid Welding Process and Joint Performances of 6106-T6 Aluminum Alloy Profiles for High Speed Trains[J]. Chinese Journal of Lasers, 2019, 46(12): 1202004

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