Mechanisms for Improvement of Weld Appearance in Autogenous Fiber Laser Welding of Thick Stainless Steels
Abstract
:1. Introduction
2. Design of Experiments (DoE)
3. Results and Discussion
3.1. Effect of Gas Jet on Formation of Nail-Head-Shaped Weld
3.1.1. Weld Appearance
3.1.2. Control Mechanism of Nail-Head-Shaped Weld with a Gas Jet
3.2. Effect of Laser Incident Angle on Formation of Spatters
3.2.1. Weld Appearance
3.2.2. Suppression Mechanism of Spatters in a Forward Welding
3.3. Effect of Welding Position on Formation of Root Sagging
3.3.1. Weld Appearance
3.3.2. Suppression Mechanism of Root Sagging in PC Welding Position
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Weld No. | Weld Sample | Weld Speed (v) (m/min−1) | Defocus (Δ) (mm) | Shielding Gas Flow (q) (L/min) (N2) | Gas Jet (Ar) | Angle of Incidence (°) | Welding Position |
---|---|---|---|---|---|---|---|
1 | Bead-on-plate | 0.9 | −5 | 10 | No | No | PA |
2 | Bead-on-plate | 0.9 | −5 | 10 | Front gas jet | No | PA |
3 | Bead-on-plate | 0.9 | −5 | 10 | Rear gas jet | No | PA |
4 | Bead-on-plate | 1.8 | +10 | 30 | No | No | PA |
5 | Bead-on-plate | 1.8 | +10 | 30 | No | +10 | PA |
6 | Bead-on-plate | 1.8 | +10 | 30 | No | −10 | PA |
7 | Modified ‘sandwich’ | 1.8 | +10 | 0 | No | No | PA |
8 | Modified ‘sandwich’ | 1.8 | +10 | 0 | No | +10 | PA |
9 | Modified ‘sandwich’ | 1.8 | +10 | 0 | No | −10 | PA |
10 | Bead-on-plate | 1.2 | +10 | 20 | No | No | PA |
11 | Bead-on-plate | 1.2 | +10 | 20 | No | No | PC |
12 | Bead-on-plate | 0.9 | +10 | 20 | No | No | PA |
13 | Bead-on-plate | 0.9 | +10 | 20 | No | No | PC |
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Zhang, M.; Chen, S.; Zhang, Y.; Chen, G.; Bi, Z. Mechanisms for Improvement of Weld Appearance in Autogenous Fiber Laser Welding of Thick Stainless Steels. Metals 2018, 8, 625. https://doi.org/10.3390/met8080625
Zhang M, Chen S, Zhang Y, Chen G, Bi Z. Mechanisms for Improvement of Weld Appearance in Autogenous Fiber Laser Welding of Thick Stainless Steels. Metals. 2018; 8(8):625. https://doi.org/10.3390/met8080625
Chicago/Turabian StyleZhang, Mingjun, Shun Chen, Yingzhe Zhang, Genyu Chen, and Zhuming Bi. 2018. "Mechanisms for Improvement of Weld Appearance in Autogenous Fiber Laser Welding of Thick Stainless Steels" Metals 8, no. 8: 625. https://doi.org/10.3390/met8080625