Laser Derusting Process for Carbon Steel Surface Based on Image Processing

Fig. 9. Descaling effect of sample under optimal process parameters. (a) Original image of sample; (b) grayscale of sample after descaling; (c) gray histogram of sample after descaling

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Fig. 10. Surface microscopic morphologies of steel plates. (a)(a1) Rusted steel plate; (b)(b1) after mechanical descaling; (c)(c1) after laser descaling

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Table 1. Main parameters of laser
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Table 1. Main parameters of laser
Parameter Value
Wavelength /nm 1064
Output power /W 25
Pulse frequency /kHz 1‒400
Pulse width /ns 5‒65
Marking range /（mm×mm×mm） 125×125×42
Scanning speed /（mm/s） 12000 （maximum）

Table 2. Laser descaling process parameters and their levels
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Table 2. Laser descaling process parameters and their levels
Symbol Factor Level 1 Level 2 Level 3
A Laser power /W 17.50 21.25 25.00
B Scanning speed /（mm/s） 1000 1250 1500
C Scanning time 25 30 35
D Line spacing /mm 0.05 0.10 0.15

Table 3. Parameters of orthogonal experiment

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Table 3. Parameters of orthogonal experiment

Sample No.	Parameter	Laser power /W	Scanning speed /（mm/s）	Scanning time	Line spacing /mm
1#	A₁B₁C₁D₁	17.50	1000	25	0.05
2#	A₁B₂C₂D₂	17.50	1250	30	0.10
3#	A₁B₃C₃D₃	17.50	1500	35	0.15
4#	A₂B₁C₂D₃	21.25	1000	30	0.15
5#	A₂B₂C₃D₁	21.25	1250	35	0.05
6#	A₂B₃C₁D₂	21.25	1500	25	0.10
7#	A₃B₁C₃D₂	25.00	1000	35	0.10
8#	A₃B₂C₁D₃	25.00	1250	25	0.15
9#	A₃B₃C₂D₁	25.00	1500	30	0.05

Table 4. Gray mean values
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Table 4. Gray mean values
Sample No. 1# 2# 3# 4# 5# 6# 7# 8# 9#
Value 146.5320 152.5276 146.4982 120.7669 146.9858 178.6153 118.3129 148.1560 146.3577

Table 5. Range analysis results
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Table 5. Range analysis results
Factor A B C D
K₁ 148.519 128.537 157.768 146.625
K₂ 148.789 149.223 139.884 149.819
K₃ 137.609 157.157 137.266 138.474

Table 6. Variance analysis results
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Table 6. Variance analysis results
Factor S f V F
Contribution
rate /%
Laser power 244.113 2 122.0565 0.390 9.75
Scanning speed 1309.945 2 654.9725 2.091 52.26
Scanning time 747.020 2 373.51 1.192 29.79
Line spacing 205.351 2 102.6755 0.328 8.20

Table 7. Optimization results of laser descaling process parameters
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Table 7. Optimization results of laser descaling process parameters
Laser power /W
Scanning speed /
（mm/s）
Scanning
time
Line spacing /
mm
Gray mean
value
20 1700 26 0.09 192.0431

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Jiazhen Duan, Ruxin Shi, Wei Zhang, Qing Wang, Xianming Ren. Laser Derusting Process for Carbon Steel Surface Based on Image Processing[J]. Chinese Journal of Lasers, 2024, 51(20): 2002208

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