Shuaishuai Chen, Wendong Zhang, Xianghuan Liu, Qiyun Chen, Boyang Li, Shuanghao Cui, Liming Liu, Hongyang Wang. Study on Coaxial Dual-Beam Laser Welding Process and Microstructure and Properties of Nodular Cast Iron QT500 and Alloy Steel 20MnCr5[J]. Chinese Journal of Lasers, 2024, 51(16): 1602102
- Chinese Journal of Lasers
- Vol. 51, Issue 16, 1602102 (2024)
Fig. 1. Metallographic structures of base materials. (a) QT500-7; (b) 20MnCr5
Fig. 2. Schematic of welding device structure
Fig. 3. Tensile sampling position and tensile sample size
Fig. 4. Weld morphologies under different pulse laser powers
Fig. 5. Weld cross-sections under different offset distances. (a) 0 mm; (b) 0.1 mm; (c) 0.2 mm; (d) 0.3 mm
Fig. 6. Characterization of welds under different offset distances
Fig. 7. Microstructures of bond zones on side of ductile iron under different offset distances. (a) Offset distance of 0 mm; (b) offset distance of 0.2 mm toward steel side
Fig. 8. Microstructures of heat-affected zones on side of ductile iron under different magnification powers. (a) 200×; (b) 500×
Fig. 9. Structure of heat-affected zone at steel side
Fig. 10. Tensile strength of joints under different pulse laser powers
Fig. 11. Tensile strength of joints under different offset distances
Fig. 12. Fracture morphologies under different offsets. (a)‒(c) Dual-beam laser offset distance of 0 mm; (d)‒(f) dual-beam laser offset distance of 0.2 mm toward steel side
Fig. 13. Hardness curves of different areas under different offset distances
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Table 1. Chemical compositions of base metal and welding wire (mass fraction, %)
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