Prediction of Weld Forming Size for Laser Welded Titanium Alloy T-joint Based on Regression Analysis

Xue Wen; Honghui Wang; Dehua Fan; Zhenglong Lei; Siyuan Bi; Hengtong Guo

doi:10.3788/LOP202259.1914007

Laser & Optoelectronics Progress, Volume. 59, Issue 19, 1914007(2022)

Prediction of Weld Forming Size for Laser Welded Titanium Alloy T-joint Based on Regression Analysis

Xue Wen¹, Honghui Wang¹, Dehua Fan², Zhenglong Lei^3、*, Siyuan Bi³, and Hengtong Guo³

Author Affiliations

¹Sinopec Jiangsu Petroleum Construction Engineering Co., Ltd., Yangzhou 225009, Jiangsu, China

²Shandong Natural Gas Pipeline Co., Ltd., Jinan 250014, Shandong, China

³State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001,Heilongjiang, China

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Figures & Tables(18)

Fig. 1. Schematic diagram of T-joint with titanium alloy skin grid structure

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Fig. 2. Schematic diagram of T-joint laser welding process

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Fig. 3. Main weld morphology characteristics of T-joint and characteristic quantity of welds under different test conditions. (a) Main morphology characteristics of welds; (b) P=2000 W, V=1.0 m/min; (c) P=2200 W, V=1.0 m/min; (d) P=2200 W, V=0.8 m/min

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Fig. 4. Schematic diagram of measurement of geometric characteristic quantity of molten pool and keyhole

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Fig. 5. Molten pool morphologies under different welding process parameters. (a) P=1000 W, V=1.0 m/min; (b) P=2000 W, V=1.0 m/min; (c) P=2000 W, V=2.0 m/min; (d) P=3000 W, V=2.0 m/min

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Fig. 6. Outline of molten pool and keyhole

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Fig. 7. Significance level of characteristic quantity of molten pool to the weld. (a) Significance level of weld penetration; (b) significance level of weld joint width

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Fig. 8. Correlation between characteristic quantity of molten pool and welds. (a) Correlation of weld penetration; (b) correlation of weld joint width

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Fig. 9. Regression model of weld joint width. (a) Regression model; (b) regression model residuals

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Fig. 10. Regression model of weld penetration. (a) Regression model; (b) regression model residuals

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Fig. 11. Size errors of weld topography predicted by regression model

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Table 1. Chemical composition of base metal of TA15 titanium alloy
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Table 1. Chemical composition of base metal of TA15 titanium alloy
Element C O H N Al V Fe Mo Zr Ti
Mass fraction /% 0.10 0.015 0.015 0.05 5.5‒7.0 0.8‒2.5 0.25 0.5‒2.0 1.5‒2.5 Bal.

Table 2. Technological parameters of laser welding test for titanium alloy T-joint
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Table 2. Technological parameters of laser welding test for titanium alloy T-joint
Welding parameter Parameter value
Laser power /kW 1.0，1.2，1.4，…，2.8，3.0
Welding speed /（m·min^-1） 0.8，1.0，1，2，…，2.2，2.4
Protective gas Ar
Protective gas flow /（L·min^-1） 15

Table 3. Part of the molten pool morphology characteristic data

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Table 3. Part of the molten pool morphology characteristic data

No.	Welding parameters		Molten pool feature					Weld feature
No.	P /W	V /（m·min^-1）	L /mm	W /mm	R /（°）	M /mm	S /mm²	WP /mm	WW /mm
1	1000	0.8	4.15	2.50	38.21	11.02	8.82	3.04	1.72
2	1000	1.0	3.86	2.21	38.31	10.23	7.02	2.72	1.30
3	1000	1.2	3.79	2.02	37.81	9.73	6.33	2.53	1.02
4	1200	0.8	4.68	2.70	34.71	12.27	10.14	3.20	1.81
5	1200	1.0	4.59	2.25	34.61	11.44	8.38	3.01	1.37
6	1200	1.2	4.38	2.11	30.71	10.50	6.72	2.79	1.16
7	1400	0.8	5.18	2.64	29.31	13.06	10.38	3.68	1.96
8	1400	1.0	4.91	2.53	1.01	12.31	9.21	3.29	1.61
9	1400	1.2	4.72	2.29	1.01	11.53	7.82	3.09	1.36

Table 4. Regression model coefficients of weld joint width
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Table 4. Regression model coefficients of weld joint width
a₀ a₁ a₂ a₃ a₄ a₅
0.17559 1.21041 -0.52678 -0.35576 0.28463 -0.36479

Table 5. Regression model coefficients of weld penetration
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Table 5. Regression model coefficients of weld penetration
a₀ a₁ a₂ a₃ a₄ a₅
5.64472 0.00119 -3.80834 5.28598×10^-7 0.97741 -2.27567×10^-4

Table 6. Analysis of regression model of T-joint weld joint width
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Table 6. Analysis of regression model of T-joint weld joint width
Item DF SS MSE F₀ P R² /%
Regression 5 19.50248 3.90050 2647.92561 1.446×10^-4 97.163
Residual 82 0.12079 0.00147
Total 87 19.62327

Table 7. Analysis of regression model of T-joint weld penetration
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Table 7. Analysis of regression model of T-joint weld penetration
Item DF SS MSE F₀ P R² /%
Regression 5 12.74066 2.54813 2173.93311 1.446×10^-4 97.973
Residual 82 0.09611 0.00117
Total 87 12.83678

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Xue Wen, Honghui Wang, Dehua Fan, Zhenglong Lei, Siyuan Bi, Hengtong Guo. Prediction of Weld Forming Size for Laser Welded Titanium Alloy T-joint Based on Regression Analysis[J]. Laser & Optoelectronics Progress, 2022, 59(19): 1914007

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