Effect of Laser Power on Microstructure and Properties of Dissimilar Steel's Laser Welded Joint

Hai Liu; Hui Chen

doi:10.3788/LOP202158.2314007

Laser & Optoelectronics Progress, Volume. 58, Issue 23, 2314007(2021)

Effect of Laser Power on Microstructure and Properties of Dissimilar Steel's Laser Welded Joint

Hai Liu^1,2 and Hui Chen^1、*

Author Affiliations

¹School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu , Sichuan 610031, China

²Department of Mechanical Engineering, Sichuan College of Chemical Technology, Luzhou , Sichuan 646005, China

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Abstract Get PDF(in Chinese)

Figures & Tables(14)

Fig. 1. Surface morphologies of welded joints with different laser powers. (a) 4 kW; (b) 5 kW; (c) 6 kW; (d) 7 kW

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Fig. 2. Section morphologies of welded joints with different laser powers. (a) 4 kW; (b) 5 kW; (c) 6 kW; (d) 7 kW

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Fig. 3. Metallographic photos of welds with different laser powers. (a) 4 kW; (b) 5 kW; (c) 6 kW; (d) 7 kW

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Fig. 4. SEM photos of welds with different laser powers. (a) 4 kW; (b) 5 kW; (c) 6 kW; (d) 7 kW

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Fig. 5. Microhardness of welded joints with different laser powers

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Fig. 6. Fracture positions of the specimens with different laser powers. (a) 4 kW; (b) 5 kW; (c) 6 kW; (d) 7 kW

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$SEM diagram of tensile fracture$

Fig. 7. SEM diagram of tensile fracture

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Fig. 8. EDS profiles of welds with different laser powers. (a) 4 kW; (b) 5 kW; (c) 6 kW; (d) 7 kW

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Fig. 9. XRD patterns of welds with different laser powers. (a) 4 kW; (b) 5 kW; (c) 6 kW; (d) 7 kW

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Table 1. Chemical composition of 304 stainless steel
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Table 1. Chemical composition of 304 stainless steel
Element C Si Mn P S Cr Ni
Mass fraction /% ≤0.08 ≤1.0 ≤2.0 ≤0.45 ≤0.03 18-20 8-11

Table 2. Chemical composition of Q345B steel
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Table 2. Chemical composition of Q345B steel
Element C Si Mn P S
Mass fraction /% ≤0.20 ≤0.50 ≤1.70 ≤0.035 ≤0.035

Table 3. Mechanical properties of 304 stainless steel and Q345B steel
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Table 3. Mechanical properties of 304 stainless steel and Q345B steel
Material Yield strength σ_s /MPa Tensile strength σ_b /MPa Elongation δ /% Hardness /HV
304 stainless steel ≥205 ≥515 ≥40 ≤210
Q345B steel ≥345 ≥460 ≥23 160-190

Table 4. Tensile strength of welding specimens with different laser powers
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Table 4. Tensile strength of welding specimens with different laser powers
Laser power /kW Tensile strength /MPa
4 486
5 482
6 482
7 481

Table 5. Mass fraction of main elements in welds
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Table 5. Mass fraction of main elements in welds
Power /kW Mass fraction /%
C Cr Ni Mn Fe
4 0.25 10.61 4.31 0.95 83.88
5 0.13 8.36 4.23 0.85 86.55
6 0.13 7.11 3.82 0.85 85.90
7 0.12 7.05 3.82 0.83 79.86

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Hai Liu, Hui Chen. Effect of Laser Power on Microstructure and Properties of Dissimilar Steel's Laser Welded Joint[J]. Laser & Optoelectronics Progress, 2021, 58(23): 2314007

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