A Seam Measurement Method Based on Micro Depth of Field for Laser Welding

Abstract:

Article Preview

For the seam feature measurement of the tight butt joint without misalignment in laser welding, current vision sensor cannot obtain the seam gap width and seam position stably and reliably. In this paper, a seam measurement method based on the micro depth of field is proposed. A four times optical magnification lens, a CCD/CMOS camera and an external LED lighting unit are used to constitute the measure system, which can be used for the tight butt joint for laser welding. Experiment indicated that it can obtain the seam gap width and seam position stably and correctly. With the method, seam surface normal vector also can be measured. The measurement accuracy for the seam gap width and seam position is 5 µm and 6 µm, respectively. Furthermore, the narrowest welding seam gap that can be measured by this method is 0.02 mm, which is fully satisfied the demand of the seam measurement in laser welding.

Info:

Periodical:

Edited by:

Dongye Sun, Wen-Pei Sung and Ran Chen

Pages:

3107-3112

Citation:

P. J. Wang et al., "A Seam Measurement Method Based on Micro Depth of Field for Laser Welding", Applied Mechanics and Materials, Vols. 121-126, pp. 3107-3112, 2012

Online since:

October 2011

Export:

Price:

$38.00

[1] J.Y. Wu, P.J. Wang and X.D. Fu: IEEE International Conference on Mechatronics and Automation (Changchun, China, August 9-12, 2009). Vol. 1-7, pp.2548-2553.

[2] J.Y. Wu, P.J. Wang and J.H. Chen: Transactions of the China Welding Vol. 30 (2009), pp.105-108, in Chinese.

[3] J.W. Kim and J.H. Shin: Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Vol. 217 (2003), pp.1305-1313.

[4] S.S. Zeng, Y.H. Shi and G.R. Wang: Welding Technology Vol. 37 (2008), pp.1-5, in Chinese.

[5] K.Y. Bae, T.H. Lee and K.C. Ahn: Journal of Materials Processing Technology Vol. 120 (2002), pp.458-465.

[6] H.Y. Shen, H.B. Ma and T. Lin: Industrial Robot-An International Journal Vol. 34 (2007), pp.467-475.

[7] H.J. Lan: Journal of Liuzhou Teachers College Vol. 16 (2001), pp.67-69, in Chinese.

[8] P.J. Wang, D.J. Chen and M.L. Wu: China Mechanical Engineering Vol. 18 (2007), pp.2555-2560, in Chinese.

[9] J.Y. Yu and S.J. Na: Mechatronics Vol. 7 (1997), pp.599-612.

[10] S.B. Chen, X.Z. Chen and T. Qiu: Journal of Intelligent and Robotic Systems Vol. 43 (2005), pp.77-97.

[11] H.Y. Shen, T. Lin and S.B. Chen: Journal of Intelligent and Robotic Systems Vol. 59 (2010), pp.283-298.

[12] S.K. Lee, S.J. Na: Journal of Manufacturing Systems Vol. 21 (2002), p.302–315.

Fetching data from Crossref.
This may take some time to load.