Design of multi-sensor on-line monitoring system for laser welding
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Material Science and Technology College, Huazhong University of Science and Technology, Wuhan 430074, China
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Received Date:
2006-07-25
Accepted Date:
2006-11-03
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Abstract
To improve the reliability of the real-time monitoring for laser welding,a multi-sensor signal sampling and processing system was built based on LabVIEW,a virtual instrument development tool.Three signals of audible sound(20Hz~20kHz),plasma optical emission(400nm~500nm),and infrared emission(1200nm~1600nm) during the laser welding process,were picked up and analyzed.Correlation analysis of the three signals shows that the two optic signals are synchronous and the audible sound signal is hysteresis to the optic signal.The hysteresis time is just equal to the sound transferring from welding point to senor,which proved the validity of the three detecting signals.Two examples show that the reliability of multi-sensor monitoring is higher than single sensor monitoring.So,the multi-sensor detecting and signal fusion is the developing direction for the laser welding monitoring in the future.
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References
|
[1]
|
LI L J.Modern laser materials processing technology and equipment[M].Beijing:Beijing Polytech University Press,1993.200～201(in Chinese). |
|
[2]
|
CAO B Q,ZENG X Y.Review of patents in laser processing in China and America[J].Laser Technology,2004,28(4):346～351(in Chinese). |
|
[3]
|
ZHOU Y Y,HU Ch K,CHEN P F.The laser welding of the double-linked gear in automobile gear-box[J].Laser Technology,2004,28(4):445～448(in Chinese). |
|
[4]
|
FANG D,YU Sh R,ZHANG J B.The present and development for laser welding[J].Journal of Gansu University of Technology,2003,19(1):15～18(in Chinese). |
|
[5]
|
TONG X.The character and application or laser welding[J].Welding Technology,2000,29(3):11～12(in Chinese). |
|
[6]
|
SUN A,KANNATEY-ASIBU E,Jr.Sensor systems for real-time monitoring of laser weld quality[J].Journal of Laser Application,1999,11(4):153～166. |
|
[7]
|
GU H,DULEY W W.Acoustic emission and optimized CO2 laserwelding of steel sheets[A].The Internaltional Congress on Applications of Laser & Electro-Optics[C].Florida:SPIE,1994.77～85. |
|
[8]
|
SMUROV M,BERTRAND I,GREVEY P.Application of near infrared pyrometry for continuous Nd:YAG laser welding of stainless steel[J].Applied Surface Science,2000,168(4):182～185. |
|
[9]
|
LUO H.The principles and technology of defect diagnosis in laserwelding of thin sheets[D].Wuhan:Huzhong University of Science and Technology,1998.56～68(in Chinese). |
|
[10]
|
DUAN A Q,ZOU Sh K,HU L J.Using plasma acoustic emission to monitor the penetration status for laser welding[J].Electromachining & Mould,2001(6):6～8. |
|
[11]
|
LUO H,HU L J,HU X Y.Fast fourier analysis of optical and acoustic signals at poor penetration in laser welding[J].Chinese Journal of Lasers,1998,25(6):32～38(in Chinese). |
|
[12]
|
ZHU Q Y,WU S P,HU L J.Coxaial realtime monitoring of gap defect in CO2 laser welding process[J].Laser Technology,2006,30(5):455～461(in Chinese). |
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