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Investigation on the arc light spectrum in GTA welding

Węglowski M. S.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 20, nr 1-2

519-522

Purpose: In the paper there are presented results of the influence of welding parameters on spectral intensity of the welding arc in the range of 340-860 nm. The main goal was checking whether the visible radiation of the arc provides information which might prove to be useful in monitoring of the welding process, similarly as the signals recorded in the electric circuit of the welding arc. Design/methodology/approach: The experimental station was designed and build. A spectrophotometer, in the visible spectral range of 340 nm to 860 nm, was used. The investigations were conducted on the automated GTA welding station. For each welding parameter the arc light spectrum was measured. Findings: Research results presented in this paper indicate that welding arc radiation contains a number of information concerning the course of the welding process. That signal is much more sensitive to the changes of welding conditions and should be used as a tool for monitoring of the TIG welding process. Research limitations/implications: The fiber spectrophotometer in the visible spectral range of 340 nm to 860 nm is an expensive instrument and that fore it can be used only as a complementary tool in monitoring of welding processes. Practical implications: The gained experience allows directing farther research on the welding arc radiation phenomenon and the possibilities of using this signal for on-line monitoring of the welding process on automated and robotized stands. This sensing system will be particularly attractive for welded structures manufacturing industry because it could significantly reduce the cost for post weld analysis and repairs. Originality/value: Three fitting functions: Lorentz, Gauss and Voight were investigated as a means to simulate the spectrum distribution. The mathematical-physical model of arc light emission and neural networks were compared.