Xutian Chai, Yan Yin, Zhipeng Wang, Kaiji Dong, Zhihui Li, Ruihua Zhang. Joint Microstructure and Properties of D36 Steel Using Narrow Gap Laser Welding[J]. Laser & Optoelectronics Progress, 2021, 58(17): 1714008
- Laser & Optoelectronics Progress
- Vol. 58, Issue 17, 1714008 (2021)
Fig. 1. Schematic diagram of narrow gap laser filler wire welding
Fig. 2. Narrow gap welding groove
Fig. 3. Sampling of macroscopic cross-section and micro-hardness of weld
Fig. 4. Structure distribution of each zone of welded joint
Fig. 5. Microstructure of base metal
Fig. 6. Microstructures of weld center. (a) Low magnification ; (b) high magnification
Fig. 7. Microstructures of HAZs. (a) CGHAZ; (b) FGHAZ; (c) INZ
Fig. 8. Overlapping microstructures in weld zone. (a) Low magnification overlapping microstructure; (b) high magnification overlapping microstructure
Fig. 9. Overlapping microstructures in heat affected zone. (a) Low magnification overlapping microstructure; (b) high magnification overlapping microstructure
Fig. 10. Microhardness of different areas of weld
Fig. 11. Tensile fracture of welded joint
Fig. 12. Stress-strain curves of tensile sample
Fig. 13. Tensile fracture morphologies. (a) Macro morphology; (b) micro morphology
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Table 1. Chemical compositions of D36 steel with high strength (mass fraction)
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Table 2. Chemical compositions of ER50-6 filler wire (mass fraction)
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Table 3. Results of tensile test
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