Hengquan Zhang, Xiaohui Zhou, Lianfeng Wei, Chao Sun, Shaojun Long, Fuyun Liu, Caiwang Tan, Xiaoguo Song. Microstructure Evolution and Mechanical Properties of 316L Joints Welded by Local Dry Underwater Laser with Double Layer Drainage[J]. Chinese Journal of Lasers, 2023, 50(12): 1202106
- Chinese Journal of Lasers
- Vol. 50, Issue 12, 1202106 (2023)
Fig. 1. Welding experimental set-up and schematic of welding process. (a) Photo of welding experimental set-up; (b) underwater local dry device and schematic of welding process
Fig. 2. Schematic of sampling and sample dimension. (a) Schematic of sampling; (b) dimensions of metallographic and tensile samples
Fig. 3. Forming of 316L stainless steel laser weld surfaces under different parameters
Fig. 4. Cross-sectional morphologies of welds under different parameters
Fig. 5. Characters of weld cross-sectional morphology under different parameters
Fig. 6. Equilibrium phase diagram of weld and Schaeffler diagram. (a) Equilibrium phase diagram of weld; (b) Schaeffler diagram[13]
Fig. 7. Microstructures of BM and weld under different parameters
Fig. 8. Welded joint samples after tensile fracture
Fig. 9. Tensile curves of welded joint samples. (a) Joint samples welded at different drainage air pressures; (b) joint samples welded at different water depths
Fig. 10. Macro-fracture surfaces of tensile samples
Fig. 11. Micro-morphologies of tensile fracture surfaces
Fig. 12. Tensile fracture path of welded joints
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Table 1. Chemical compositions of base material (BS)
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Table 2. Experimental parameters used during underwater laser welding process
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Table 3. Measured grain size
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