Measurement of micro weld joint position based on magneto-optical imaging

doi:10.1088/1674-1056/24/1/018103

Abstract In a laser butt joint welding process, it is required that the laser beam focus should be controlled to follow the weld joint path accurately. Small focus wandering off the weld joint may result in insufficient penetration or unacceptable welds. Recognition of joint position offset, which describes the deviation between the laser beam focus and the weld joint, is important for adjusting the laser beam focus and obtaining high quality welds. A new method based on the magneto-optical (MO) imaging is applied to measure the micro weld joint whose gap is less than 0.2 mm. The weldments are excited by an external magnetic field, and an MO sensor based on principle of Faraday magneto effect is used to capture the weld joint images. A sequence of MO images which are tested under different magnetic field intensities and different weld joint widths are acquired. By analyzing the MO image characteristics and extracting the weld joint features, the influence of magnetic field intensity and weld joint width on the MO images and detection of weld joint position is observed and summarized.

Keywords: micro weld joint magneto-optical imaging laser welding

Received: 18 April 2014
Revised: 01 September 2014
Accepted manuscript online:

PACS:	81.20.Vj	(Joining; welding)
	78.20.Ls	(Magneto-optical effects)
	42.62.-b	(Laser applications)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51175095), the Natural Science Foundation of Guangdong Province, China (Grant No. 10251009001000001), the Guangdong Provincial Project of Science and Technology Innovation of Discipline Construction, China (Grant No. 2013KJCX0063), and the Science and Technology Plan Project of Guangzhou City, China (Grant No. 1563000554).

Corresponding Authors: Gao Xiang-Dong
E-mail: gaoxd666@126.com

Cite this article:

Gao Xiang-Dong (高向东), Chen Zi-Qin (陈子琴) Measurement of micro weld joint position based on magneto-optical imaging 2015 Chin. Phys. B 24 018103

[1]	Gao X D, Mo L, Zhong X G, You D Y and Katayama S 2011 Acta Phys. Sin. 60 088105 (in Chinese)
[2]	Katayama S, Kawahito Y and Mizutani M 2010 Laser Assisted Net Shape Engineering 6, Proceedings of the LANE 2010, Part 2, 2010 Physics Procedia p. 9
[3]	Birdeanu A V, Ciuca C and Puicea A 2012 J. Mater. Process. Tech. 212 890
[4]	Gao X D, Mo L, Wen Q and Katayama S 2013 Weld. J. 92 251
[5]	Moiseev A A, Gelikonov G V, Terpelov D A, Shilyagin P A and Gelikonov V M 2012 Laser Phys. Lett. 9 826
[6]	Gao X D and Zhang Y X 2014 Int. J. Precis. Eng. Man. 15 399
[7]	Zhang H M, Wang L Y, Yan B, Li L, Xi X Q and Lu L Z 2013 Chin. Phys. B 22 078701
[8]	Ye X H and Chen X 2002 Chin. Phys. Lett. 19 788
[9]	Felisberto M K, Lopes H S, Centeno T M and Arruda L V R 2006 Comput. Vis. Image Und. 102 238
[10]	Gao X D and Wen Q 2013 Laser Phys. 23 126001
[11]	Zhu J J, Jiang S Q, Wang W Y, Zhao C, Wu Y H, Luo M and Quan W W 2014 Chin. Phys. B 23 048702
[12]	Vicek J, Lesnak M, Pistora J and Zivotsky O 2013 Opt. Commun. 286 372
[13]	Wang L Q and Wang W M 2014 Chin. Phys. B 23 028703
[14]	Gao X D and Chen Y Q 2014 Int. J. Adv. Manuf. Technol. 73 23
[15]	Deng Y, Liu X and Udpa L 2012 IEEE T. Reliab. 61 901
[16]	Gehring G A, Alshammari M S, Score D S, Neal J R, Mokhtari A and Fox A M 2012 J. Magn. Magn. Mater. 324 3422
[17]	Zhou H M, Chen Q and Deng J H 2014 Chin. Phys. B 23 047502
[18]	Gao X D, Liu Y H and Yong D Y 2014 Opt. Laser Technol. 62 141

[1]	Novel inspection of welded joint microstructure using magneto-optical imaging technology Xiang-dong Gao(高向东), Zheng-wen Li(李正文), De-yong You(游德勇), Seiji Katayama. Chin. Phys. B, 2017, 26(5): 054214.

No Suggested Reading articles found!

Viewed

Full text

Abstract

Cited

Metrics
Related Articles

Measurement of micro weld joint position based on magneto-optical imaging

Cite this article:

Online attention