Microstructures and Mechanical Properties of Hundred-Millimeter-Grade 304 Stainless Steel Joints by Ultra-Narrow Gap Laser Welding

Wuxiong Yang; Jijun Xin; Chao Fang; Wenhua Dai; Jing Wei; Jiefeng Wu; Yuntao Song

doi:10.3788/CJL201845.0702005

Chinese Journal of Lasers, Volume. 45, Issue 7, 0702005(2018)

Microstructures and Mechanical Properties of Hundred-Millimeter-Grade 304 Stainless Steel Joints by Ultra-Narrow Gap Laser Welding

Wuxiong Yang¹, Jijun Xin^2,3,4, Chao Fang^{2、* *}, Wenhua Dai^2,3,4, Jing Wei^2,4, Jiefeng Wu^2,4, and Yuntao Song^2,3,4

Author Affiliations

¹ Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China

² Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Auhui 230031, China

³ University of Science and Technology of China, Hefei, Anhui 230026, China

⁴ Anhui Key Laboratory of Special Welding Technology, Huainan, Anhui 232000, China

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Figures & Tables(13)

Fig. 1. Schematic of ultra-narrow gap laser welding

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Fig. 2. Schematic of ultra-narrow gap grooves

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Fig. 3. Schematic of tensile specimen

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Fig. 4. Weld appearance. (a) Weld in groove;(b) weld profile

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Fig. 5. Joint specimen and its cross-sectional appearance

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Fig. 6. Microstructures at different zones of joints. (a) Low magnification; (b) fusion line; (c) lap zone; (d) fine grain zone; (e) mixed zone; (f) local magnification of Fig. 6(e)

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Fig. 7. Stress-strain curves of joints

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Fig. 8. Fracture morphologies of joints. (a) Low magnification; (b) high magnification

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$(a) Particle on joint fracture surface and (b) its energy spectrum analysis result$

Fig. 9. (a) Particle on joint fracture surface and (b) its energy spectrum analysis result

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Fig. 10. Microhardness distributions at different positions of joints

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Table 1. Chemical compositions of 304 austenitic stainless steels (mass fraction, %)
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Table 1. Chemical compositions of 304 austenitic stainless steels (mass fraction, %)
Element C Si Mn Cr Ni N P S Fe
Content 0.039 0.54 1.12 18.22 8.01 0.061 0.035 0.003 Bal.

Table 2. Chemical compositions of ER 347 austenitic stainless steel filler (mass fraction,%)
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Table 2. Chemical compositions of ER 347 austenitic stainless steel filler (mass fraction,%)
Element C Si Mn Cr Ni Mo P S Nb Fe
Content 0.03 0.40 1.34 19.24 9.55 <0.02 0.017 0.013 0.51 Bal.

Table 3. Welding process parameters
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Table 3. Welding process parameters
Position Laserpower /kW Welding speed /(m·min^-1) Wire feedspeed /(m·min^-1) Defocusing /mm Gas flow rate /(L·min^-1)
Root pass 5000 1.0 - +5 20
Filler or cover pass 4500 0.6 2.0 +40 20

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Wuxiong Yang, Jijun Xin, Chao Fang, Wenhua Dai, Jing Wei, Jiefeng Wu, Yuntao Song. Microstructures and Mechanical Properties of Hundred-Millimeter-Grade 304 Stainless Steel Joints by Ultra-Narrow Gap Laser Welding[J]. Chinese Journal of Lasers, 2018, 45(7): 0702005

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Paper Information

Category: laser manufacturing

Received: Jan. 12, 2018

Accepted: --

Published Online: Sep. 11, 2018

The Author Email: Fang Chao (fangchao@ipp.ac.cn)

DOI:10.3788/CJL201845.0702005

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Chemical compositions of 304 austenitic stainless steels (mass fraction, %)

Table 1. Chemical compositions of 304 austenitic stainless steels (mass fraction, %)

Table 2. Chemical compositions of ER 347 austenitic stainless steel filler (mass fraction,%)

Table 2. Chemical compositions of ER 347 austenitic stainless steel filler (mass fraction,%)

Table 3. Welding process parameters

Table 3. Welding process parameters