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
- Chinese Journal of Lasers
- Vol. 45, Issue 7, 0702005 (2018)
Fig. 1. Schematic of ultra-narrow gap laser welding
Fig. 2. Schematic of ultra-narrow gap grooves
Fig. 3. Schematic of tensile specimen
Fig. 4. Weld appearance. (a) Weld in groove;(b) weld profile
Fig. 5. Joint specimen and its cross-sectional appearance
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)
Fig. 7. Stress-strain curves of joints
Fig. 8. Fracture morphologies of joints. (a) Low magnification; (b) high magnification
Fig. 9. (a) Particle on joint fracture surface and (b) its energy spectrum analysis result
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 2. Chemical compositions of ER 347 austenitic stainless steel filler (mass fraction,%)
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Table 3. Welding process parameters
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