Spectrum analysis of the arc for laser-guided robot welding applications

George Agapiou; C. Kassiouras; Alexander A. Serafetinides

doi:10.1117/12.316616

14 July 1998 Spectrum analysis of the arc for laser-guided robot welding applications

George Agapiou, C. Kassiouras, Alexander A. Serafetinides

Proceedings Volume 3423, Second GR-I International Conference on New Laser Technologies and Applications; (1998) https://doi.org/10.1117/12.316616
Event: Second GR-I International Conference on New Laser Technologies and Applications, 1997, Olympia, Greece

Abstract

In robot arc welding applications, in order to overcome inaccuracies of the robot itself and the workpiece, the tracking of the seam is of primal importance. To detect the seam, a novel sensor based on a laser scanner and using triangulation methods has been developed. A definite problem of the development is the difference in the optical power emitted by the arc which is in the range of hundreds of Watts and the power of the diode laser in the range of mW. In order to achieve good signal to noise ratio, it is necessary to select a wavelength where the glow of the arc is minimal and design an appropriate interference filter. For this purpose detailed measurements and analysis of the spectrum of the welding arc have been performed. The measurements extend for the UV region of the spectrum to the near IR region. The study was concentrated on the welding of ferrous metals using as shielding gas a mixture of 80 percent Ar and 20 percent CO₂ and welding currents in the range of 100A to 160A. The measurements have revealed the presence of many strong emission lines in the spectrum.

Citation Download Citation

George Agapiou, C. Kassiouras, and Alexander A. Serafetinides "Spectrum analysis of the arc for laser-guided robot welding applications", Proc. SPIE 3423, Second GR-I International Conference on New Laser Technologies and Applications, (14 July 1998); https://doi.org/10.1117/12.316616

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