Relationship Analysis between Multi-Parameters and Ferrite Number in GTAW Based on ANN Model
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Modeling of the FN-Prediction Models
3.2. The Accuracies of the FN-Prediction Models
4. FN-Prediction Model under Holistic Modeling
5. Influence Analysis of Various Factors
- (1)
- Welding speed. With the increase of welding speed, heat input decreases, causing the high temperature residence time to decrease. Due to the insufficient transformation from ferrite to austenite, FN will increase. On the other hand, the increase of welding speed decreases the dilution rate of the base metal, causing the Creq/Nieq ratio to reduce, thus the FN in the weld will decrease.
- (2)
- Wire-feed rate. As wire-feed rate increases, more heat is used to melt welding consumables, resulting in a decrease in heat input and an increase in FN. On the other hand, the increase of wire-feed rate will decrease the dilution rate of the base metal, causing FN to decrease.
- (3)
- Welding current and arc length. With the increase of welding current and arc length, the heat input and dilution rate will both increase, causing FN to decrease or increase respectively.
6. Conclusions
- The ANN-based FN-prediction models trained by the orthogonal test data were stable and insensitive to different materials with different manufacturers and heat-treatment conditions. High performance can be achieved by modeling different materials separately. In the FN-prediction models for DFSS and ASIS, the correlation coefficients of total samples (R_All) reached 0.99337 and 0.98762 respectively. The effect of holistic modeling of different materials was also satisfactory, and could meet the requirements of engineering practice. In the holistic FN-prediction model, R_All reached 0.96811.
- FN decreased monotonously with the increase in nitrogen content. In production, through the FN-prediction models proposed in this paper, FN can be accurately and easily controlled by adjusting the nitrogen content in the shielding gas when other welding parameters are fixed.
- The influences of welding speed, wire-feed rate, arc length and welding current on FN were analyzed based on the FN-prediction model for DFSS. The results show that the influences of either parameters on FN were nonlinear. The FN-prediction models proposed in this paper can provide useful information to researchers about this nonlinearity.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Abbreviations | Physical Quantities |
---|---|
FN | ferrite number |
ANN | artificial neural network |
DFSS | Dongfang Special Steel hot-rolled sheet |
ASIS | Anshan Iron and Steel cold-rolled sheet |
GTAW | gas tungsten rc weld |
MSE | the mean square error |
R_Training | the correlation coefficients of training set |
R_Validation | the correlation coefficients of validation set |
R_Test | the correlation coefficients of test set |
R_All | the correlation coefficients of total samples |
Element | C | Si | Mn | Ni | Cr | P | S | Mo | Nb | Cu | N |
---|---|---|---|---|---|---|---|---|---|---|---|
Substrate | 0.024 | 0.38 | 1.42 | 8.01 | 18.28 | 0.051 | 0.024 | 0.23 | 0.0054 | 0.30 | 0.039 |
Filling wire | 0.021 | 0.50 | 1.65 | 9.57 | 19.74 | 0.026 | 0.00074 | 0.096 | 0.012 | 0.098 | 0.013 |
Level | Factors | ||||
---|---|---|---|---|---|
A Travel Speed v (mm∙s−1) | B Wire-Feed Rate (mm∙s−1) | C Welding Current (A) | D Arc Length (mm) | E Nitrogen Content (%) | |
1 | 4 | 12.5 | 150 | 2.5 | 0 |
2 | 5 | 13.5 | 165 | 3.5 | 0.5 |
3 | 6 | 14.5 | 180 | 4.5 | 1.0 |
4 | 7 | 15.5 | 195 | 5.5 | 2.0 |
5 | 8 | 16.5 | 210 | 6.5 | 2.5 |
Test No. | Factors | The Average FN | |||||
---|---|---|---|---|---|---|---|
A | B | C | D | E | DFSS | ASIS | |
1 | A1 | B1 | C1 | D1 | E1 | 6.82 | 6.28 |
2 | A1 | B2 | C2 | D2 | E2 | 5.48 | 5.30 |
3 | A1 | B3 | C3 | D3 | E3 | 3.68 | 3.60 |
4 | A1 | B4 | C4 | D4 | E4 | 2.02 | 1.82 |
5 | A1 | B5 | C5 | D5 | E5 | 1.86 | 1.07 |
6 | A2 | B1 | C3 | D4 | E5 | 0.74 | 1.38 |
7 | A2 | B2 | C4 | D5 | E1 | 6.02 | 4.88 |
8 | A2 | B3 | C5 | D1 | E2 | 4.98 | 5.34 |
9 | A2 | B4 | C1 | D2 | E3 | 4.40 | 4.44 |
10 | A2 | B5 | C2 | D3 | E4 | 1.94 | 1.62 |
11 | A3 | B1 | C5 | D2 | E4 | 1.40 | 2.24 |
12 | A3 | B2 | C1 | D3 | E5 | 0.71 | 0.92 |
13 | A3 | B3 | C2 | D4 | E1 | 4.18 | 3.86 |
14 | A3 | B4 | C3 | D5 | E2 | 4.40 | 4.70 |
15 | A3 | B5 | C4 | D1 | E3 | 3.74 | 4.80 |
16 | A4 | B1 | C2 | D5 | E3 | 1.48 | 1.80 |
17 | A4 | B2 | C3 | D1 | E4 | 1.50 | 2.62 |
18 | A4 | B3 | C4 | D2 | E5 | 1.16 | 1.86 |
19 | A4 | B4 | C5 | D3 | E1 | 5.68 | 4.48 |
20 | A4 | B5 | C1 | D4 | E2 | 4.80 | 4.56 |
21 | A5 | B1 | C4 | D3 | E2 | 3.50 | 4.08 |
22 | A5 | B2 | C5 | D4 | E3 | 1.88 | 2.70 |
23 | A5 | B3 | C1 | D5 | E4 | 0.82 | 0.57 |
24 | A5 | B4 | C2 | D1 | E5 | 2.24 | 0.82 |
25 | A5 | B5 | C3 | D2 | E1 | 4.90 | 3.52 |
Hidden Nodes | Epoch | MSE | Gradient | R_Training | R_Validation | R_Test | R_All |
---|---|---|---|---|---|---|---|
2 | 17 | 0.2350 | 0.00284 | 0.96393 | 0.96774 | 0.97223 | 0.96567 |
4 | 18 | 0.0708 | 0.08390 | 0.98692 | 0.98281 | 0.98905 | 0.98664 |
6 | 18 | 0.0411 | 0.00932 | 0.99376 | 0.99460 | 0.99302 | 0.99337 |
8 | 7 | 0.0365 | 3.26 × 10−11 | 0.99491 | 0.98921 | 0.98922 | 0.99340 |
10 | 6 | 0.0232 | 8.19 × 10−9 | 0.99653 | 0.98753 | 0.98855 | 0.99257 |
Hidden Nodes | Epoch | MSE | Gradient | R_Training | R_Validation | R_Test | R_All |
---|---|---|---|---|---|---|---|
2 | 23 | 0.3210 | 5.16 × 10−5 | 0.93982 | 0.92551 | 0.92817 | 0.93722 |
4 | 19 | 0.1160 | 0.03140 | 0.97718 | 0.97556 | 0.96109 | 0.97319 |
6 | 15 | 0.0648 | 3.25 × 10−8 | 0.98735 | 0.98270 | 0.98659 | 0.98689 |
8 | 9 | 0.0693 | 4.58 × 10−9 | 0.98759 | 0.98318 | 0.98876 | 0.98762 |
10 | 7 | 0.0688 | 5.07 × 10−9 | 0.98829 | 0.98963 | 0.98566 | 0.98740 |
12 | 6 | 0.0587 | 4.99 × 10−14 | 0.99017 | 0.97508 | 0.97881 | 0.98633 |
14 | 6 | 0.0578 | 1.10 × 10−10 | 0.99024 | 0.98843 | 0.96523 | 0.98609 |
Hidden Nodes | Epoch | MSE | Gradient | R_Training | R_Validation | R_Test | R_All |
---|---|---|---|---|---|---|---|
2 | 20 | 0.591 | 0.02000 | 0.90387 | 0.87916 | 0.88421 | 0.89614 |
4 | 24 | 0.194 | 0.02760 | 0.96599 | 0.96179 | 0.96448 | 0.96478 |
6 | 13 | 0.186 | 1.20 × 10−8 | 0.96658 | 0.97196 | 0.97261 | 0.96811 |
8 | 9 | 0.183 | 6.47 × 10−9 | 0.97271 | 0.95684 | 0.95878 | 0.96778 |
10 | 9 | 0.168 | 1.43 × 10−11 | 0.97332 | 0.95667 | 0.95227 | 0.96786 |
Heat Input | High Temperature Residence Time | FN | |
---|---|---|---|
welding speed↑ | ↓ | ↓ | ↑ |
wire-feed rate↑ | ↓ | ↓ | ↑ |
welding current↑ | ↑ | ↑ | ↓ |
arc length↑ | ↑ | ↑ | ↓ |
Dilution Rate | Creq/Nieq Ratio | FN | |
---|---|---|---|
welding speed↑ | ↓ | ↓ | ↓ |
wire-feed rate↑ | ↓ | ↓ | ↓ |
welding current↑ | ↑ | ↑ | ↑ |
arc length↑ | ↑ | ↑ | ↑ |
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Cheng, S.; Cheng, F.; Li, L.; Li, F.; Shao, Z.; Zhang, Y.; Wu, S. Relationship Analysis between Multi-Parameters and Ferrite Number in GTAW Based on ANN Model. Metals 2021, 11, 1429. https://doi.org/10.3390/met11091429
Cheng S, Cheng F, Li L, Li F, Shao Z, Zhang Y, Wu S. Relationship Analysis between Multi-Parameters and Ferrite Number in GTAW Based on ANN Model. Metals. 2021; 11(9):1429. https://doi.org/10.3390/met11091429
Chicago/Turabian StyleCheng, Shanghua, Fangjie Cheng, Lidong Li, Fangliang Li, Zhujing Shao, Yiqi Zhang, and Shaojie Wu. 2021. "Relationship Analysis between Multi-Parameters and Ferrite Number in GTAW Based on ANN Model" Metals 11, no. 9: 1429. https://doi.org/10.3390/met11091429