Welding Characteristics and Porosity Control of Weaving Laser-MIG Hybrid Welding of Aluminum Alloys

Chuang Cai; Jia Xie; Zhijie Liu; Hanping Wang; Hui Chen

doi:10.3788/CJL202148.1802002

Chinese Journal of Lasers, Volume. 48, Issue 18, 1802002(2021)

Welding Characteristics and Porosity Control of Weaving Laser-MIG Hybrid Welding of Aluminum Alloys

Chuang Cai^*, Jia Xie, Zhijie Liu, Hanping Wang, and Hui Chen

Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China

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Fig. 1. Schematics of oscillating laser-MIG hybrid welding. (a) Schematic of welding; (b) schematic of oscillating scanning path

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Fig. 2. Weld seam cross-section comparison of numerical and experimental results (weaving frequency of 30 Hz, weaving diameter of 0.2 mm)

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Fig. 3. Droplet transfer during laser-MIG hybrid welding of aluminum alloy. (a) Non-weaving laser; (b)(c) weaving laser at different positions with the same weaving parameter

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Fig. 4. Weld seam cross-section of laser-MIG hybrid welded aluminum alloys. (a) Non-weaving laser; (b) weaving frequency of 30 Hz, weaving diameter of 2 mm; (c) weaving frequency of 30 Hz, weaving diameter of 0.2 mm; (d) weaving frequency of 50 Hz, weaving diameter of 0.2 mm

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Fig. 5. Porosity distribution of laser-MIG hybrid weld seam of aluminum alloy. (a) Non-weaving laser; (b) weaving frequency of 30 Hz, weaving diameter of 2 mm; (c) weaving frequency of 30 Hz, weaving diameter of 0.2 mm

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Fig. 6. Upper surface of molten pool during laser-MIG hybrid welding process(non-weaving laser)

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Fig. 7. Upper surface of molten pool during laser-MIG hybrid welding process(weaving diameter of 0.2 mm)

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Fig. 8. Upper surface of molten pool during laser-MIG hybrid welding process(weaving diameter of 2 mm)

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Fig. 9. Longitudinal section of molten pool during laser-MIG hybrid welding process. (a) Non-weaving laser; (b) weaving diameter of 0.2 mm; (c) weaving diameter of 2 mm

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Fig. 10. Keyhole depth evolution curves during welding

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Fig. 11. Molten pool flow field on longitudinal section during laser-MIG hybrid welding process. (a) Non-weaving laser; (b) weaving diameter of 0.2 mm; (c) weaving diameter of 2 mm

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Table 1. Chemical composition of base metal and welding filler wire
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Table 1. Chemical composition of base metal and welding filler wire
Material Mass fraction /%
Si Fe Cu Mn Mg Cr Zn Ti Al
A7N01P-T4 ≤0.3 ≤0.35 ≤0.2 0.2--0.7 1.0--2.0 ≤0.3 4.0--5.0 ≤0.20 Bal.
ER5356 ≤0.25 ≤0.40 ≤0.10 0.05--0.20 4.5--5.5 0.05--0.20 ≤0.10 0.06--0.20 Bal.

Table 2. Process parameters for laser-MIG hybrid welding
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Table 2. Process parameters for laser-MIG hybrid welding
Parameter Value
Laser power /W 4000
Speed of welding /(m·min^-1) 1
Wire feeding speed /(m·min^-1) 8.0
Laser weaving diameter /mm 0.2 , 2
Laser weaving frequency /Hz 30, 50
Shielding gas flow /(L·min^-1) 30

Table 3. Weld penetration depth at different weaving laser parameters
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Table 3. Weld penetration depth at different weaving laser parameters
No. Laser weavingfrequency /Hz Laser weavingdiameter /mm Weld penetrationdepth /mm
a Non-weaving Non-weaving 5.6
b 30 2.0 4.6
c 30 0.2 5.7
d 50 0.2 6.8

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Chuang Cai, Jia Xie, Zhijie Liu, Hanping Wang, Hui Chen. Welding Characteristics and Porosity Control of Weaving Laser-MIG Hybrid Welding of Aluminum Alloys[J]. Chinese Journal of Lasers, 2021, 48(18): 1802002

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