Influence of External Longitudinal Magnetic Field on Weld Joint Morphology and Microstructure in Laser-Metal Inert Gas Hybrid Welding

Fig. 5. Influence of external longitudinal magnetic field on weld joint forming characteristics. (a) Forming coefficient; (b) reinforcement coefficient; (c) penetration ratio; (d) width waist ratio

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Fig. 6. Microstructure of SUS316L austenitic stainless steel base metal

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Fig. 7. XRD patterns of weld joint under different magnetic induction intensities.(a) B=0 mT; (b) B=12 mT; (c) B=22 mT

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Fig. 8. Microstructure of top area of weld joints under different magnetic induction intensities.(a) B=0 mT; (b) B=12 mT; (c) B=22 mT

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Fig. 9. Microstructure of middle area of weld joints under different magnetic induction intensities.(a) B=0 mT; (b) B=12 mT; (c) B=22 mT

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Fig. 10. SEM images of HAZ of weld joints under different magnetic induction intensities.(a) B=0 mT; (b) B=12 mT; (c) B=22 mT; (d) partial enlarged view of Fig. 10(c)

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Fig. 11. EDS analysis results. (a) Test area; (b) test point A; (c) test point B

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Fig. 12. Microhardness distributions of weld joints under different magnetic induction intensities and illustrations show corresponding test areas. (a) Top; (b) middle; (c) bottom

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Fig. 13. Standard deviation of microhardness distribution

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Table 1. Chemical compositions of base metal and filler wire (mass fraction, %)
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Table 1. Chemical compositions of base metal and filler wire (mass fraction, %)
Element C Mn Si S P Cr Ni Mo Fe
Base metal ≤0.03 ≤2.00 ≤0.75 ≤0.030 ≤0.045 16.0-18.0 10.0-14.0 2.0-3.0 Bal.
Filler wire ≤0.03 1.0-2.5 0.83 ≤0.020 ≤0.030 18.0-20.0 11.0-14.0 2.5-3.0 Bal.

Table 2. Parameters of laser-MIG hybrid welding assisted with external longitudinal magnetic field
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Table 2. Parameters of laser-MIG hybrid welding assisted with external longitudinal magnetic field
Laserpower /kW Current /A Welding speed /(m·min^-1) Focal pointdistance /mm D_LA /mm B /mT
2.0 150 1.1 0 2 0, 8, 12, 16, 22

Table 3. Weld joints and cross-sectional morphologies under different magnetic induction intensities
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Table 3. Weld joints and cross-sectional morphologies under different magnetic induction intensities
B /mT Weld joint morphology Cross-sectional morphology of weld joint
0
8
12
16
22

Table 4. EDS analysis results

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Table 4. EDS analysis results

Element	Point A		Point B
Element	Mass fraction /%	Atomic fraction /%	Mass fraction /%	Atomic fraction /%
Si	0.98	1.94	0.65	1.29
Cr	22.44	24.02	18.66	19.95
Mn	1.22	1.24	1.76	1.78
Fe	64.47	64.24	64.87	64.57
Ni	6.08	5.77	11.58	10.97
Mo	4.80	2.79	2.47	1.43

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Zhang Xun, Li Ruoyang, Zhao Zeyang, Mi Gaoyang, Wang Chunming, Hu Xiyuan. Influence of External Longitudinal Magnetic Field on Weld Joint Morphology and Microstructure in Laser-Metal Inert Gas Hybrid Welding[J]. Chinese Journal of Lasers, 2017, 44(8): 802008

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Paper Information

Category: laser manufacturing

Received: Sep. 8, 2016

Accepted: --

Published Online: Sep. 13, 2017

The Author Email:

DOI:10.3788/CJL201744.0802008

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Chemical compositions of base metal and filler wire (mass fraction, %)

Table 1. Chemical compositions of base metal and filler wire (mass fraction, %)

Table 2. Parameters of laser-MIG hybrid welding assisted with external longitudinal magnetic field

Table 2. Parameters of laser-MIG hybrid welding assisted with external longitudinal magnetic field

Table 3. Weld joints and cross-sectional morphologies under different magnetic induction intensities

Table 3. Weld joints and cross-sectional morphologies under different magnetic induction intensities

Table 4. EDS analysis results

Table 4. EDS analysis results