Research on Laser Cleaning Process of Paint Layer on Carbon Fiber Composite Aircraft Skin

Junyi Gu; Wenqin Li; Xuan Su; Jie Xu; Bin Guo

doi:10.3788/CJL230927

Chinese Journal of Lasers, Volume. 51, Issue 12, 1202201(2024)

Research on Laser Cleaning Process of Paint Layer on Carbon Fiber Composite Aircraft Skin

Junyi Gu¹, Wenqin Li¹, Xuan Su^2、*, Jie Xu^1,2,3, and Bin Guo^1,2,3、**

Author Affiliations

¹School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, Guangdong , China

²Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450046, Henan , China

³Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin 150080, Heilongjiang , China

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Figures & Tables(17)

Fig. 1. Morphologies of CFRP sample and composition of paint layer elements. (a) Macroscopic morphology of CFRP sample; (b) microscopic morphology of CFRP sample; (c) composition of paint layer elements

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Fig. 2. Laser cleaning system

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Fig. 3. Measurement items of laser confocal microscope. (a) Laser cleaning depth; (b) surface roughness of laser cleaning area

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Fig. 4. Macroscopic morphologies of CFRP sample after laser cleaning

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Fig. 5. SEM images of CFRP samples after laser cleaning. (a1)(a2) Sample No. 22; (b1)(b2) sample No. 20; (c1)(c2) sample No. 25

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Fig. 6. 3D profiles of laser cleaning areas of CFRP samples

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Fig. 7. 3D profiles of cleaned-uncleaned boundary areas

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Fig. 8. Infrared thermal imaging patterns of samples at peak temperature

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Fig. 9. Infrared thermal imaging images. (a) Typical infrared thermal imaging feature of cleaning area; (b) temperature response curve during laser cleaning; (c)‒(h) infrared thermal imaging characteristics of samples at different moments during cleaning process (interval of 1/25 s)

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Fig. 10. Dynamic behavior during laser cleaning

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Table 1. Experimental variables and levels
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Table 1. Experimental variables and levels
Parameter Level 1 Level 2 Level 3 Level 4 Level 5
Laser power /W 100 150 200 250 300
Scanning speed /（mm/s） 3000 2500 2000 1500 1000
Repetition frequency /kHz 20 25 30 35 40
Overlap ratio /% 90 80 70 60 50

Table 2. Orthogonal array (L25)

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Table 2. Orthogonal array (L25)

Order No.	P /W	V /（mm/s）	f /kHz	η /%	Order No.	P /W	V /（mm/s）	f /kHz	η /%
1	100	3000	20	90	14	200	1500	20	70
2	100	2500	25	80	15	200	1000	25	60
3	100	2000	30	70	16	250	3000	35	80
4	100	1500	35	60	17	250	2500	40	70
5	100	1000	40	50	18	250	2000	20	60
6	150	3000	25	70	19	250	1500	25	50
7	150	2500	30	60	20	250	1000	30	90
8	150	2000	35	50	21	300	3000	40	60
9	150	1500	40	90	22	300	2500	20	50
10	150	1000	20	80	23	300	2000	25	90
11	200	3000	30	50	24	300	1500	30	80
12	200	2500	35	90	25	300	1000	35	70
13	200	2000	40	80

Table 3. Values and S/N statistics of H, S_a, and T

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Table 3. Values and S/N statistics of H, S_a, and T

Sample No.	H		S_a		T
Sample No.	Measured value	S/N	Measured value	S/N	Measured value	S/N
1	6.40 μm	16.12	4.28 μm	12.63	396.2 ℃	-51.96
2	7.20 μm	17.15	2.33 μm	7.35	349.3 ℃	-50.86
3	8.80 μm	18.89	1.09 μm	0.75	301.2 ℃	-49.58
4	3.30 μm	10.37	1.23 μm	1.80	302.0 ℃	-49.60
5	1.90 μm	5.58	3.40 μm	10.63	344.1 ℃	-50.73
6	3.00 μm	9.54	1.48 μm	3.41	311.9 ℃	-49.88
7	2.90 μm	9.25	0.88 μm	-1.11	271.3 ℃	-48.67
8	2.00 μm	6.02	1.01 μm	0.09	272.2 ℃	-48.70
9	35.86 μm	31.09	4.35 μm	12.77	552.5 ℃	-54.85
10	37.97 μm	31.59	4.89 μm	13.79	485.7 ℃	-53.73
11	2.40 μm	7.60	1.20 μm	1.58	295.0 ℃	-49.40
12	58.70 μm	35.37	6.27 μm	15.95	590.4 ℃	-55.42
13	42.90 μm	32.65	2.52 μm	8.03	433.7 ℃	-52.74
14	16.20 μm	24.19	1.55 μm	3.81	377.3 ℃	-51.53
15	20.70 μm	26.32	2.43 μm	7.71	404.3 ℃	-52.13
16	12.20 μm	21.73	2.29 μm	7.20	410.0 ℃	-52.26
17	15.70 μm	23.92	2.12 μm	6.53	370.2 ℃	-51.37
18	9.82 μm	19.84	1.19 μm	1.51	293.9 ℃	-49.36
19	11.70 μm	21.36	1.93 μm	5.71	327.3 ℃	-50.30
20	140.50 μm	42.95	9.74 μm	19.77	599.6 ℃	-55.56
21	6.90 μm	16.78	2.11 μm	6.49	298.1 ℃	-49.49
22	9.90 μm	19.91	1.54 μm	3.75	264.5 ℃	-48.45
23	70.09 μm	37.01	9.02 μm	19.10	506.5 ℃	-54.09
24	44.50 μm	32.97	3.16 μm	9.99	508.6 ℃	-54.13
25	43.40 μm	32.75	7.24 μm	17.19	467.1 ℃	-53.39

Table 4. Average S/N response

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Table 4. Average S/N response

Level	Average S/N response for H				Average S/N response for S_a				Average S/N response for T
Level	P	V	f	η	P	V	f	η	P	V	f	η
K1	13.62	14.35	22.33	32.51	6.63	6.26	7.10	16.04	50.55	50.60	51.01	54.38
K2	17.50	21.12	22.28	27.22	5.79	6.49	8.66	9.27	51.16	50.95	51.45	52.74
K3	25.23	22.88	22.33	21.86	7.42	5.90	6.20	6.34	52.25	50.89	51.47	51.15
K4	25.96	24.00	21.25	16.51	8.14	6.82	8.44	3.28	51.77	52.08	51.87	49.85
K5	27.88	27.84	22.00	12.10	11.31	13.82	8.89	4.35	51.91	53.11	51.84	49.52
σ	14.26	13.48	1.08	20.42	5.52	7.923	2.70	12.77	1.70	2.51	0.87	4.86
Rank	2	3	4	1	3	2	4	1	3	2	4	1

Table 5. Results of variance analysis in H
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Table 5. Results of variance analysis in H
Source DF Adj-SS Adj-MS F value $P^{'}$ Rate of contribution /%
P 4 755.94 188.99 14.53 0.001 28.72
V 4 490.28 122.57 9.43 0.004 18.62
f 4 4.28 1.07 0.08 0.986 0.16
η 4 1329.64 332.41 25.56 0 50.51
Error 8 104.03 13 1.98
Total 24 2684.17

Table 6. Results of variance analysis in S_a
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Table 6. Results of variance analysis in S_a
Source DF Adj-SS Adj-MS F value $P^{'}$ Rate of contribution /%
P 4 89.79 22.45 8.5 0.006 10.15
V 4 224.44 56.11 21.24 0 25.36
f 4 26.89 6.72 2.54 0.122 3.04
η 4 522.87 130.72 49.47 0 59.07
Error 8 21.14 2.64 2.39
Total 24 885.13

Table 7. Results of variance analysis in T
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Table 7. Results of variance analysis in T
Source DF Adj-SS Adj-MS F value $P^{'}$ Rate of contribution /%
P 4 9.07 2.27 9.13 0.004 7.66
V 4 22.01 5.5 22.15 0 18.56
f 4 2.48 0.62 2.49 0.126 2.09
η 4 82.97 20.74 83.48 0 69.09
Error 8 1.99 0.25 1.69
Total 24 118.51

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Junyi Gu, Wenqin Li, Xuan Su, Jie Xu, Bin Guo. Research on Laser Cleaning Process of Paint Layer on Carbon Fiber Composite Aircraft Skin[J]. Chinese Journal of Lasers, 2024, 51(12): 1202201

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