Process research of laser transmission connection of polystyrene and titanium
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摘要: 为了解决激光透射难以实现连接聚苯乙烯与钛的问题，采用氧等离子体处理后的聚苯乙烯与经激光表面处理的薄钛进行了激光透射连接。建立了激光透射连接工艺参量的数学模型，分析了工艺参量对连接强度的交互式影响，得到了优化工艺参量。结果表明，经过处理后的聚苯乙烯与薄钛再进行激光连接时，其连接强度从0.5MPa提高到6.0MPa以上，有效解决了聚苯乙烯与钛的激光透射连接难题；通过优化工艺参量可获得最优的工艺参量组合。该研究为此工艺的工业应用奠定了基础。Abstract: In order to solve the problem that laser transmission was difficult to connect polystyrene and titanium, polystyrene treated with oxygen plasma was used for laser transmission connection with thin titanium treated by laser surface treatment. Mathematical model of laser transmission connection process parameters was established, and interactive influence of process parameters on connection strength was analyzed. The optimized process parameters were obtained. The results show that the bonding strength of polystyrene and thin titanium after treatment increases from 0.5MPa to more than 6.0MPa. Laser transmission connection problem of polystyrene and titanium can effectively be solved. The combination of the optimum process parameters can be obtained by optimizing the process parameters. The research makes the foundation for industrial application of the process.
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Figure 5. Interactive effects of laser treatment power and surface scanning speed on welding strength
a-contours plot b-response surface plot
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Figure 6. Interactive effects of scanning speed and processing time on welding strength
a-contours plot b-response surface plot
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Figure 7. Interactive effects of laser bonding power and laser treatment power on welding strength
a-contours plot b-response surface plot
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Figure 8. Interactive effects of laser bonding power and scanning speed on welding strength
a-contours plot b-response surface plot
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Figure 9. Interactive effects of laser bonding speed and scanning speed on welding strength
a-contours plot b-response surface plot
Table 1 Primary process parameters and their ranges
design
variablesvariable
codeinitial
valueminimum maximum laser bonding power/W T1 5 4 6 laser bonding speed/(mm·s-1) T2 2 1 3 focal shift/mm T3 0 -1 1 laser sweep power/W T4 5 4 6 scanning speed/(mm·s-1) T5 2 1 3 scanning frequency n T6 6 4 8 processing time/s T7 120 90 150 
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Table 2 Process parameters and their limits
parameters limits -1 0 +1 laser bonding power/W 4 5 6 laser bonding speed/(mm·s-1) 1 2 3 laser sweep power/W 4 5 6 scanning speed/(mm·s-1) 1 2 3 processing time/s 90 120 150
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Table 3 Table of variance analysis for joint width model
source sum of squares degree freedom mean square F value probability>f model 213.46 20 10.67 115.19 ＜0.0001 significant A 0.022 1 0.022 0.23 0.6316 B 0.19 1 0.19 2.05 0.1631 C 0.058 1 0.058 0.62 0.436 D 5.77×10-4 1 5.77×10-4 6.22×10-3 0.9377 E 9.86×10-3 1 9.86×10-3 0.11 0.7466 AB 0.038 1 0.038 0.41 0.528 AC 1.51×10-3 1 1.51×10-3 0.016 0.8992 AD 8.00×10-4 1 8.00×10-4 8.63×10-3 0.9266 AE 0.02 1 0.02 0.22 0.6457 BC 0.014 1 0.014 0.15 0.7043 BD 1.80×10-3 1 1.80×10-3 0.019 0.8901 BE 3.20×10-3 1 3.20×10-3 0.035 0.8539 CD 5.00×10-3 1 5.00×10-3 5.40×10-4 0.9816 CE 3.20×10-3 1 3.20×10-3 0.035 0.8539 DE 4.51×10-3 1 4.51×10-3 0.049 0.8269 A2 6.15 1 6.15 66.37 ＜0.0001 B2 0.31 1 0.31 3.4 0.0755 C2 2.55 1 2.55 27.55 ＜0.0001 D2 0.41 1 0.41 4.42 0.0444 E2 4.90 1 4.9 52.87 ＜0.0001 residual 2.69 29 0.093 lack of fit 2.40 22 0.11 2.71 0.0895 not significant pure error 0.28 7 0.04 corrected toal 216.15 49 stand deviation:0.3 R2=0.9876 mean:3.01 adjusted R2=0.979 coefficient of variation:10.11 predicted R2=0.969 predicted residual of sum of squares:6.7 adequate precision:25.094
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Table 4 Verification of mathematical model
A/W B/
(mm·s-1)C/W D/
(mm·s-1)E/s strength/MPa actual predicted error 4.5 1 5 2 90 3.08 3.25 5.5% 5 2 5.5 1 120 4.46 4.68 4.9% 5.5 3 6 3 150 3.78 3.98 5.2%
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